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PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

25-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE

REGULATOR MODULE

FEATURES

APPLICATIONS

?

General-Purpose, Industrial Controls,

HVAC Systems, Test and Measurement,

Medical Instrumentation, AC/DC Adaptors,

Vehicles, Marine, and Avionics

?

4-A Output Current

?

Wide-Input Voltage

(9 V to 29 V)

?

Wide-Output Voltage Adjust

(–15 V to –3 V)

?

High Efficiency (Up to 87%)

Output Current Limit

Overtemperature Shutdown

Undervoltage Lockout

Operating Temperature: –40°C to 85°C

Surface-Mount Package Available

DESCRIPTION

The PTN78020A is a series of high-efficiency buck-boost-integrated switching regulators (ISR), that represent the

third generation in the evolution of high-performance power modules designed for industrial use. The wide-input

voltage range makes these modules suitable for a variety of applications that operate off 12–V, 24–V, and

tightly-regulated 28–V dc power. In new designs, they should be considered in place of the PT6640 and

PT78NR100 series of single in-line pin (SIP) products. The PTN78020A is smaller and lighter than its

predecessors, and has either similar or improved electrical performance characteristics. The caseless,

double-sided package has excellent thermal characteristics, and is compatible with TI's roadmap for RoHS and

lead-free compliance.

The PTN78020A operates over an input voltage range of 9 V to 29 V, and provides high-efficiency,

positive-to-negative voltage conversion for loads of up to 4 A. The output voltage is set using a single external

resistor, and may be adjusted to any value within the range, –15 V to –3 V.

V

O

1

7

STANDARD APPLICATION

PTN78020A

(Top View)

V

I

6

2

L

O

A

D

3

4

5

C1*

C2*

C3*

100 mF

4x 4.7 mF

Ceramic

100 mF

(Required)

Electrolytic

(Required)

R

SET

#

(Required)

1 %, 0.05 W

(Required)

GND

*See the Application Information for capacitor recommendation.

#R is required to adjust the output voltage lower than -3 V. See the Application Information for values.

SET

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright ? 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

These devices have limited built-in ESD protection. The leads should be shorted together or the device

placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

ORDERING INFORMATION

PTN78020 (Basic Model)

Output Voltage

Part Number

PTN78020AAH

PTN78020AAS⁽¹⁾⁽²⁾

PTN78020AAZ⁽¹⁾⁽³⁾

Description

Package Designator

EUK-7

Horizontal T/H (Pb-free)

Horizontal SMD (standard)

Horizontal SMD (Pb-free)

–15 V to –3 V

EUL-7

(1) Add a T suffix for tape and reel option on SMD packages.

(2) Standard option specifies Sn/Pb solder ball material.

(3) Lead (Pb) - free option specifies Sn/Ag solder ball material.

(1)

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted

all voltages with respect to GND

UNIT

T_A

Operating free-air temperature Over V_Irange

–40°C to 85°C

Horizontal SMD (suffix AS)

Horizontal SMD (suffix AZ)

235°C

260°C

Surface temperature of module body or

pins

Solder reflow temperature

T_S

Storage temperature

Output power

–40°C to 125°C

25 W

P_O

|V_O| ≥ 12 V

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

RECOMMENDED OPERATING CONDITIONS

MIN

9

MAX

32 – |V_O|

85

UNIT

V

V_I

Input voltage

T_A

Operating free-air temperature

-40

°C

PACKAGE SPECIFICATIONS

PTN78020x (Suffix AH, AS, & AZ)

Weight

7.3 grams

Flammability

Meets UL 94 V-O

(1)

Horizontal T/H (suffix AH)

Horizontal SMD (suffix AS and AZ)

Horizontal T/H (suffix AH)

250 Gs

Per Mil-STD-883D, Method 2002.3, 1 ms, ? sine,

mounted

Mechanical shock

(1)

125 Gs

(1)

20 Gs

Mechanical vibration

Mil-STD-883D, Method 2007.2, 20-2000 Hz

(1)

Horizontal SMD (suffix AS and AZ)

10 Gs

(1) Qualification limit.

2

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

ELECTRICAL CHARACTERISTICS

operating at 25°C free-air temperature, V_I= 20 V, V_O= –5 V, I_O= I_O(max), C_I= 100 μF and 4x 4.7 μF, C_O= 100 μF (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

0.1

9

TYP

MAX

UNIT

(1)

V_O= -3 V

V_O= -5 V

V_O= -12 V

4

(1)

4

T_A= 25°C, natural convec-

I_O

Output current

A

tion airflow

(1)

2.1

(1)

(2)

V_O= -15 V

V_O= -3 V

V_O= -5 V

1.67

29

9

27

V_I

Input voltage range

Over I_Orange

V

V_O= -12 V

V_O= -15 V

9

20

9

17

Set-point voltage tolerance

Temperature variation

Line regulation

T_A= 25°C

±2%⁽³⁾

-40°C to +85°C

Over V_Irange

Over I_Orange

-0.5%

-10

mV

V_O

Load regulation

-10

Includes set point, line, load

-40 < T_A< 85°C

(3)

Total output voltage variation

Output voltage adjust range

-3%

V_O(adj)

9 V ≤ V_I≤ (32 – |V_O|) V

V_I= 12 V, R_SET= 100 ?, V_O= –15 V

V_I= 12 V, R_SET= 2 k?, V_O= –12 V

V_I= 20 V, R_SET= 28.7 k?, V_O= –5 V

V_I= 24 V, R_SET= 221 k?, V_O= –3.3 V

20-MHz bandwidth

-15

- 3

V

87%

86%

η

Efficiency

82%

77%

Output voltage ripple

Current limit threshold

1% V_O

8.5

V_(PP)

A

I_{O (LIM)}

?V_O= –50 mV

1 A/μs load step from 50% to 100%

I_Omax

Transient response

Recovery time

V_Oover/undershoot

Over V_Iand I_Oranges

V_Iincreasing

200

5

μs

%V_O

kHz

V

F_S

Switching frequency

Undervoltage lockout

440

550

5.5

660

UVLO

(4)

Ceramic

18.8

C_I

External input capacitance

μF

(4)

Nonceramic

100

Ceramic

200

(5)

(6)

C_O

External output capacitance

Calculated reliability

Nonceramic

100

10

2,000

Equivalent series resistance (nonceramic)

m?

Per Telcordia SR-332, 50% stress,

T_A= 40°C, ground benign

10⁶Hrs

MTBF

5.6

(1) The maximum output current is 4 A, or a maximum output power of 25 W, whichever is less.

(2) The maximum input voltage is limited and defined to be (32 – |V_O|) volts.

(3) The set-point voltage tolerance is affected by the tolerance and stability of R_SET. The stated limit is unconditionally met if R_SEThas a

tolerance of 1% with 100 ppm/°C or better temperature stability.

(4) A minimum 100-μF electrolytic and four 4.7-μF ceramic capacitors are required across the input (V_Iand GND) for proper operation.

Locate the ceramic capacitors close to the module.

(5) 100 μF of output capacitance is required for proper operation. See the application information for further guidance.

(6) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m? as the minimum when using max-ESR values to

calculate.

3

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

PIN ASSIGNMENT

1

7

PTN78020A

(Top View)

2

6

3

4

5

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

The negative output voltage power connection. It is also the reference for the V_OAdjust control input. For

proper operation, pins 1 and 7 must be connected.

V_O

1, 7

O

I

V_I

2

3

The positive input voltage power node to the module, which is referenced to common GND.

This pin is active and must be isolated from any electrical connection.

N/C

A 1% resistor must be connected between pin 4 and pin 7 to set the output voltage of the module lower

than -3 V. If left open-circuit, the output voltage defaults to -3 V. The temperature stability of the resistor

should be 100 ppm/°C (or better). The set-point range is -15 V to -3 V. The standard resistor value for a

number of common output voltages is provided in the application information.

V_OAdjust

4

I

N/C

5

6

This pin is active and must be isolated from any electrical connection.

The common ground connection for V_Iand V_Opower connections.

GND

I/O

4

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

(1)(2)

TYPICAL CHARACTERISTICS (9-V INPUT)

EFFICIENCY

vs

OUTPUT CURRENT

OUTPUT VOLTAGE RIPPLE

vs

POWER DISSIPATION

vs

OUTPUT CURRENT

100

95

5

300

V

= -12 V

V

= -15 V

V

O

= -12 V

V

= -15 V

4.5

O

V

O

= -12 V

O

90

4

250

85

V

= -15 V

3.5

3

O

80

75

70

65

60

200

2.5

2

150

100

50

V

= -3 V

O

V

= -5 V

O

1.5

1

V

= -5 V

55

O

V

= -5 V

O

50

0.5

V

= -3 V

V = -3 V

O

45

O

0

40

0

1

2

3

4

3

0

1

2

4

0

1

2

3

4

I

O

- Output Current - A

I

O

- Output Current - A

I

O

- Output Current - A

Figure 1.

Figure 2.

Figure 3.

TEMPERATURE DERATING

vs

TEMPERATURE DERATING

vs

TEMPERATURE DERATING

vs

OUTPUT CURRENT

90

80

70

60

80

70

60

80

70

60

200 LFM

100 LFM

Nat conv

200 LFM

100 LFM

Nat conv

100 LFM

Nat conv

50

40

V

= -15 V

V

= -12 V

O

30

V

= -5 V

O

20

0

0.4

0.8

1.2

1.6

0

0.3 0.6 0.9 1.2 1.5 1.8 2.1

0

1

2

3

4

I

- Output Current - A

I

O

- Output Current - A

O

I

O

- Output Current - A

Figure 4.

Figure 5.

Figure 6.

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 1, Figure 2, and Figure 3.

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.

Applies to Figure 4, Figure 5, and Figure 6.

5

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

(1)(2)

TYPICAL CHARACTERISTICS (12-V INPUT)

EFFICIENCY

vs

OUTPUT CURRENT

OUTPUT VOLTAGE RIPPLE

vs

POWER DISSIPATION

vs

OUTPUT CURRENT

100

95

5

300

V

= -15 V

V

O

= -12 V

V

O

= -12 V

O

4.5

V

= -12 V

O

90

V

= -5 V

4

V

= -5 V

O

250

O

85

V

= -15 V

O

3.5

3

V

= -15 V

O

80

75

70

65

60

200

2.5

2

150

100

50

V

= -5 V

O

1.5

1

V

= -3 V

O

55

V

= -3 V

O

50

45

0.5

V

= -3 V

O

40

0

1

2

3

4

3

0

1

2

4

0

1

2

3

4

I

O

- Output Current - A

I

O

- Output Current - A

I

O

- Output Current - A

Figure 7.

Figure 8.

Figure 9.

TEMPERATURE DERATING

vs

TEMPERATURE DERATING

vs

TEMPERATURE DERATING

vs

OUTPUT CURRENT

90

80

70

60

80

70

60

80

70

60

200 LFM

100 LFM

Nat conv

50

Nat conv

40

V

= -12 V

V

= -15 V

O

30

V

= -5 V

O

20

0

0.3 0.6 0.9 1.2 1.5 1.8 2.1

0

0.4

0.8

1.2

1.6

0

1

2

3

4

I

O

- Output Current - A

I

O

- Output Current - A

I

- Output Current - A

O

Figure 10.

Figure 11.

Figure 12.

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 7, Figure 8, and Figure 9.

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.

Applies to Figure 10, Figure 11, and Figure 12.

6

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

(1)(2)

TYPICAL CHARACTERISTICS (24-V INPUT)

EFFICIENCY

vs

OUTPUT CURRENT

OUTPUT VOLTAGE RIPPLE

vs

OUTPUT CURRENT

90

80

70

60

50

40

140

V

= -5 V

O

120

100

80

V

= -5 V

O

60

V

= -3 V

O

40

20

0

V

= -3 V

O

0

1

2

3

4

3

0

1

2

4

I

O

- Output Current - A

I

- Output Current - A

O

Figure 13.

Figure 14.

POWER DISSIPATION

vs

OUTPUT CURRENT

TEMPERATURE DERATING

vs

OUTPUT CURRENT

5

90

4.5

80

70

60

4

V

= -5 V

O

3.5

3

200 LFM

2.5

2

100 LFM

50

Nat conv

1.5

1

V

= -3 V

O

40

0.5

30

V

= -5 V

O

0

1

2

3

4

20

I

- Output Current - A

0

1

2

3

4

O

I

- Output Current - A

O

Figure 15.

Figure 16.

(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the

converter. Applies to Figure 13, Figure 14, and Figure 15.

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.

Applies to Figure 16.

7

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

APPLICATION INFORMATION

Adjusting the Output Voltage of the PTN78020A Wide-Output Adjust Power Modules

General

A resistor must be connected directly between the V_OAdjust control (pin 4) and the output voltage (pin 7) to set

the output voltage lower than –3 V. The adjustment range is from –15 V to –3 V. If pin 4 is left open, the output

voltage defaults to the highest value, –3 V.

Table 1 gives the standard resistor value for a number of common voltages, and with the actual output voltage

that the value produces. For other output voltages, the resistor value can either be calculated using the following

formula, or simply selected from the range of values given in Table 2. Figure 17 shows the placement of the

required resistor.

1.25 V

- 5.62 kW

R

= 54.9 kW ′

SET

|V | - 3 V

O

Input Voltage Considerations

The PTN78020A is a buck-boost switching regulator. In order that the output remains in regulation, the input

voltage must not exceed the output by a maximum differential voltage.

Another consideration is the pulse width modulation (PWM) range of the regulator's internal control circuit. For

stable operation, its operating duty cycle should not be lower than some minimum percentage. This defines the

maximum advisable ratio between the regulator's input and output voltage magnitudes.

For satisfactory performance, the maximum operating input voltage range must be equal to (32 - |V_O|) volts.

As an example, Table 1 gives the operating input voltage range for the common output bus voltages. In addition,

the Electrical Characteristics define the available output voltage adjust range for various input voltages.

Table 1. Standard Values of R_setfor Common Output

Voltages

V_O

R_SET

(Standard Value)

V_O

(Actual)

Operating

V_IRange

(Required)

–15 V

–12 V

–5 V

100 ?

2 k?

–14.997 V

–12.006 V

–5.000 V

–3.303 V

9 V to 17 V

9 V to 20 V

9 V to 27 V

9 V to 28.7 V

28.7 k?

221 k?

–3.3 V

V

I

V

O

2

1, 7

PTN78020A

V_O

V

I

GND

Adj

6

4

+

C1

C2

R

SET

C3

0.05 W

1%

+

GND

(1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or

better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 1

using dedicated PCB traces.

(2) Never connect capacitors from V_OAdjust to either GND or V_out. Any capacitance added to the V_OAdjust pin affects

the stability of the regulator.

Figure 17. V_OAdjust Resistor Placement

8

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

Table 2. Output Voltage Set-Point Resistor Values

V_ORequired

–15.0 V

–14.9 V

–14.8 V

–14.7 V

–14.6 V

–14.5 V

–14.4 V

–14.3 V

–14.2 V

–14.1 V

–14.0 V

–13.9 V

–13.8 V

–13.7 V

–13.6 V

–13.5 V

–13.4 V

–13.3 V

–13.2 V

–13.1 V

–13.0 V

–12.9 V

–12.8 V

–12.7 V

–12.6 V

–12.5 V

–12.4 V

–12.3 V

–12.2 V

–12.1 V

–12.0 V

R_SET

99 ?

V_ORequired

–11.9 V

–11.8 V

–11.7 V

–11.6 V

–11.5 V

–11.4 V

–11.3 V

–11.2 V

–11.1 V

–11.0 V

–10.9 V

–10.8 V

–10.7 V

–10.6 V

–10.5 V

–10.4 V

–10.3 V

–10.2 V

–10.1 V

–10.0 V

–9.9 V

R_SET

V_ORequired

–8.8 V

–8.6 V

–8.4 V

–8.2 V

–8.0 V

–7.8 V

–7.6 V

–7.4 V

–7.2 V

–7.0 V

–6.8 V

–6.6 V

–6.4 V

–6.2 V

–6.0 V

–5.8 V

–5.6 V

–5.4 V

–5.2 V

–5.0 V

–4.8 V

–4.6 V

–4.4 V

–4.2 V

–4.0 V

–3.8 V

–3.6 V

–3.4 V

–3.2 V

–3.0 V

R_SET

2.09 k?

2.18 k?

2.27 k?

2.36 k?

2.45 k?

2.55 k?

2.65 k?

2.75 k?

2.82 k?

2.96 k?

3.07 k?

3.18 k?

3.29 k?

3.41 k?

3.53 k?

3.65 k?

3.78 k?

3.91 k?

4.04 k?

4.18 k?

4.33 k?

4.47 k?

4.62 k?

4.78 k?

4.94 k?

5.10 k?

5.27 k?

5.45 k?

5.63 k?

5.82 k?

6.01 k?

6.21 k?

6.63 k?

7.09 k?

7.58 k?

8.11 k?

8.68 k?

9.30 k?

9.98 k?

10.7 k?

11.5 k?

12.4 k?

13.4 k?

14.6 k?

15.8 k?

17.3 k?

18.9 k?

20.7 k?

22.9 k?

25.6 k?

28.7 k?

32.5 k?

37.2 k?

43.4 k?

51.6 k?

63.0 k?

80.1 k?

109 k?

166 k?

338 k?

OPEN

147 ?

196 ?

245 ?

296 ?

347 ?

400 ?

453 ?

507 ?

562 ?

619 ?

676 ?

734 ?

794 ?

854 ?

916 ?

979 ?

1.04 k?

1.11 k?

1.18 k?

1.24 k?

1.31 k?

1.38 k?

1.46 k?

1.52 k?

1.60 k?

1.68 k?

1.76 k?

1.84 k?

1.92 k?

2.01 k?

–9.8 V

–9.7 V

–9.6 V

–9.5 V

–9.4 V

–9.3 V

–9.2 V

–9.1 V

–9.0 V

–8.9 V

9

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

CAPACITOR RECOMMENDATIONS FOR THE PTN78020 WIDE-OUTPUT

ADJUST POWER MODULES

Input Capacitor

The minimum requirement for the input capacitance is 18.8-μF (4× 4.7-μF) ceramic capacitance, in either a X5R

or X7R temperature characteristic, and 100-μF of nonceramic capacitance. Ceramic capacitors should be located

within 0.5 inch (1,27 cm) of the regulator's input pins. Electrolytic capacitors must be used at the input in addition

to the required ceramic capacitance. The minimum ripple current rating for any nonceramic capacitance must be

at least 750 mA rms for output currents of 3 A or less. The ripple current rating of electrolytic capacitors is a

major consideration when they are used at the input. This ripple current requirement can be reduced by placing

more ceramic capacitors at the input, in addition to the minimum required 18.8-μF.

Tantalum capacitors are not recommended for use at the input bus, as none were found to meet the minimum

voltage rating of 2 × (maximum dc voltage + ac ripple). This voltage derating is standard practice for regular

tantalum capacitors to ensure reliability. Polymer-tantalum capacitors are more reliable, and are available with a

maximum rating of typically 20 V. These can be used with input voltages up to 16 V.

Output Capacitor

The minimum electrolytic capacitance required to ensure stability is a 100-μF capacitor. Either ceramic or

electrolytic-type capacitors can be used. The minimum ripple current rating for the nonceramic capacitance must

be at least 250 mA rms. The stability of the module and voltage tolerances is compromised if the capacitor is not

placed near the output bus pins. A high-quality, computer-grade electrolytic capacitor should be adequate. A

ceramic capacitor can be also be located within 0.5 inch (1,27 cm) of the output pin.

For applications with load transients (sudden changes in load current), the regulator response improves with

additional capacitance. Additional electrolytic capacitors should be located close to the load circuit. These

capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz. Aluminum electrolytic capacitors are

suitable for ambient temperatures above 0°C. For operation below 0°C, tantalum or Os-Con-type capacitors are

recommended. When using one or more nonceramic capacitors, the calculated equivalent ESR should be no

lower than 10 m? (17 m? using the manufacturer's maximum ESR for a single capacitor). A list of recommended

capacitors and vendors are identified in Table 3.

Ceramic Capacitors

Above 150 kHz, the performance of aluminum electrolytic capacitors becomes less effective. To further reduce

the reflected input ripple current or the output transient response, multilayer ceramic capacitors must be added.

Ceramic capacitors have low ESR, and their resonant frequency is higher than the bandwidth of the regulator.

When placed at the output, their combined ESR is not critical as long as the total value of ceramic capacitance

does not exceed 200 μF.

Tantalum Capacitors

Tantalum-type capacitors may be used at the output, and are recommended for applications where the ambient

operating temperature can be less than 0°C. The AVX TPS, Sprague 593D/594/595, and Kemet

T495/T510/T520 capacitors series are suggested over many other tantalum types due to their rated surge, power

dissipation, and ripple current capability. As a caution, many general-purpose tantalum capacitors have

considerably higher ESR, reduced power dissipation, and lower ripple current capability. These capacitors are

also less reliable as they have lower power dissipation and surge current ratings. Tantalum capacitors that do not

have a stated ESR or surge current rating are not recommended for power applications. When specifying

Os-Con and polymer-tantalum capacitors for the output, the minimum ESR limit is encountered well before the

maximum capacitance value is reached.

Capacitor Table

The capacitor table, Table 3, identifies the characteristics of capacitors from vendors with acceptable ESR and

ripple current (rms) ratings. The recommended number of capacitors required at both the input and output buses

is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are

available with comparable specifications. Those listed are for guidance. The rms rating and ESR (at 100 kHz) are

critical parameters necessary to ensure both optimum regulator performance and long capacitor life.

10

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

Designing for Load Transients

The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of

1 A/μs. The typical voltage deviation for this load transient is given in the data sheet specification table using the

required value of output capacitance. As the di/dt of a transient is increased, the response of a converter's

regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation of

any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target application

specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output

capacitor decoupling. In these cases, special attention must be paid to the type, value, and ESR of the

capacitors selected.

Table 3. Recommended Input/Output Capacitors

CAPACITOR CHARACTERISTICS

QUANTITY

85°C

MAXIMUM

RIPPLE

CURRENT

(mArms)

CAPACITOR VENDOR/

COMPONENT

SERIES

EQUIVALENT

VENDOR

NUMBER

WORKING

VOLTAGE

(V)

PHYSICAL

SIZE

(mm)

VALUE

(μF)

SERIES

RESISTANCE

(ESR) (?)

INPUT OUTPUT

BUS

FC( Radial)

35

50

16

180

330

150

0.090

0.12

755

900

10 × 16

12,5 × 13,5

10 × 12,2

1

EEUFC1V331 (V_I< 30 V)

EEVFK1H181Q

(1)

FK (SMD)

1

United Chemi-Con PXA (SMD)

0.026

3430

≤1

PXA16VC151MJ80TP (V_I, |V_O|

< 14 V)

(1)

1

(1)

PS

25

35

25

100

220

470

0.020

0.090

4320

760

10 × 12,5

10 × 10

1

≤ 1

1

25PS100M J12 (V_I< 20 V)

LXZ35VB221M10X12LL

(1)

LXZ

1

MVZ (SMD)

670

1

MVZ25VC471MJ10TP (V_I< 20

V)

Nichicon UWG (SMD)

35

10

50

20

330

100

150

120

100

0.15

670

2000

979

10 × 10

7,7 × 4,3

10 × 12,5

10 × 12,7

8 × 10,5

1

UWG1V331MNR1GS

F551A107MN (V_O≤ 5 V)

UHD1H151MHR

(2)

(3)

F550 (Tantalum)

0.055

0.061

0.020

0.024

0.085

N/R

≤ 3

HD

1

(1)

Sanyo Os-Con SVP (SMD)

SP

4300

3110

1543

1

≤ 1

≤ 3

20SVP150M (V_I≤ 16 V)

20SP180M (V_I≤ 16 V)

(1)

(2)

7,3 L × 4,3 N/R

W × 4,1 H

TPSV107M020R0085

(|V_O| ≤ 10 V)

AVX Tantalum TPS (SMD)

20

6.3

16

100

47

0.200

0.002

> 817

>1000

3225

N/R

≤ 3

≤ 2

≤ 4

1

TPSE107M020R0200

(|V_O| ≤ 10 V)

Murata X5R Ceramic

TDK X5R Ceramic

Murata X5R Ceramic

Kemet X5R Ceramic

TDK X5R Ceramic

Murata X5R Ceramic

TDK X7R Ceramic

Murata X7R Ceramic

Kemet X7R Ceramic

AVX X7R Ceramic

GRM32ER60J107M

(|V_O| ≤ 5.5 V)

C3225X5R0J107MT

(|V_O| ≤ 5.5 V)

(1)

4

GRM32ER61C476M

(|V_o| ~ V_I≤ 13.5 V)

(2)

(4)

6.3

25

47

N/R

≥ 8

C1210C476K9PAC

(|V_O| ≤ 5.5 V)

47

C3225X5R0J476MT

(|V_O| ≤ 5.5 V)

47

GRM42-2X5R476M6.3

(|V_O| ≤ 5.5 V)

2.2

C3225X7R1E225KT/MT

(|V_O| ≤ 20 V)

25

1

GRM32RR71E225K

(|V_O| ≤ 20 V)

25

1

C1210C225K3RAC

(V_I, |V_O| ≤ 20 V)

25

1

C12103C225KAT2A

(V_I, |V_O| ≤ 20 V)

(1) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the

regulator at a higher input voltage, select a capacitor with the next higher voltage rating.

(2) Not recommended (N/R). The voltage rating does not meet the minimum operating limits in most applications.

(3) The maximum voltage rating of the capacitor must be selected for the desired set-point voltage (V_O). To operate at a higher output

voltage, select a capacitor with a higher voltage rating.

(4) The maximum rating of the ceramic capacitor limits the regulator operating input voltage to 20 V. Select a alternative ceramic

component to operate at a higher input voltage.

11

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

Table 3. Recommended Input/Output Capacitors (continued)

CAPACITOR CHARACTERISTICS

QUANTITY

85°C

MAXIMUM

RIPPLE

CURRENT

(mArms)

CAPACITOR VENDOR/

EQUIVALENT

VENDOR

NUMBER

WORKING

VOLTAGE

(V)

PHYSICAL

SIZE

(mm)

COMPONENT

SERIES

VALUE

(μF)

SERIES

RESISTANCE

(ESR) (?)

INPUT OUTPUT

BUS

(2)

Kemet X7R Ceramic

Murata X7R Ceramic

TDK X7R Ceramic

50

1.0

4.7

2.2

1.0

0.002

>1000

3225

N/R

1

C1210C105K5RAC

≥ 4

≥ 8

GRM32ER71H475KA88L

C3225X7R1H225KT

GRM32RR71H105KA01L

C3225X7R1H105KT

C330C105K5R5CA

(2)

Murata X7R Ceramic

TDK X7R Ceramic

N/R

(2)

Kemet Radial Through-hole

5,08 × 7,62 N/R

× 9,14 H

Murata Radial Through-hole

50

2.2

0.004

>1000

10 H × 10

W × 4 D

≥ 8

1

RPER71H2R2KK6F03

12

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

Power-Up Characteristics

When configured per the standard application, the PTN78020A power module produces a regulated output

voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows

the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the

input source. The soft-start circuitry introduces a short time delay (typically 5 ms – 10 ms) into the power-up

characteristic. This is from the point that a valid input source is recognized. Figure 18 shows the power-up

waveforms for a PTN78020A, operating from a 12-V input and with the output voltage adjusted to –5-V. The

waveforms were measured with a 3-A resistive load.

V (5 V/div)

I

V

O

(2 V/div)

I (2 A/div)

I

t - Time = 5 ms/div

Figure 18. Power-Up Waveforms

Undervoltage Lockout

The undervoltage lockout (UVLO) circuit prevents the module from attempting to power up until the input voltage

is above the UVLO threshold. This prevents the module from drawing excessive current from the input source at

power up. Below the UVLO threshold, the module is held off.

Current Limit Protection

The PTN78020 modules protect against load faults with a continuous current limit characteristic. Under a load

fault condition, the output current cannot exceed the current limit value. Attempting to draw current that exceeds

the current limit value causes the module to progressively reduce its output voltage. Current is continuously

supplied to the fault until it is removed. On removal of the fault, the output voltage promptly recovers. When

limiting output current, the regulator experiences higher power dissipation, which increases its temperature. If the

temperature increase is excessive, the module overtemperature protection begins to periodically turn the output

voltage completely off.

Overtemperature Protection

A thermal shutdown mechanism protects the module's internal circuitry against excessively high temperatures. A

rise in temperature may be the result of a drop in airflow, a high ambient temperature, or a sustained current limit

condition. If the junction temperature of the internal control IC rises excessively the module turns itself off,

reducing the output voltage to zero. The module instantly restarts when the sensed temperature decreases by a

few degrees.

Overtemperature protection is a last-resort mechanism to prevent damage to the module. It should not be relied

on as permanent protection against thermal stress. Always operate the module within its temperature derated

limits, for the worst-case operating conditions of output current, ambient temperature, and airflow. Operating the

module above these limits, albeit below the thermal shutdown temperature, reduces the long-term reliability of

the module.

13

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

Optional Input/Output Filters

Power modules include internal input and output ceramic capacitors in all of their designs. However, some

applications require much lower levels of either input reflected or output ripple/noise. This application describes

various filters and design techniques found to be successful in reducing both input and output ripple/noise.

Input/Output Capacitors

The easiest way to reduce output ripple and noise is to add one or more 1-μF ceramic capacitors, such as C5

shown in Figure 19. Ceramic capacitors should be placed close to the output power terminals. A single 1-μF

capacitor reduces the output ripple/noise by 10% to 30% for modules with a rated output current of less than 3 A.

(Note: C4 is required to improve the regulator transient response, and does not reduce output ripple and noise.)

Switching regulators draw current from the input line in pulses at their operating frequency. The amount of

reflected (input) ripple/noise generated is directly proportional to the equivalent source impedance of the power

source including the impedance of any input lines. The addition of C1, minimum 1-μF ceramic capacitor, near the

input power pins, reduces reflected conducted ripple/noise by 10% to 30%.

PTN78020A

V

O

2

1, 7

I

V

I

O

GND

Adjust

6

4

#

C1

C2

C3*

C5

1 mF

C4

100 mF

(Required)

R

SET

1 mF

50 V

100 mF

Electrolytic

4 x 4.7 mF

Ceramic

(Required)

GND

* See the specifications for required value and type.

# See the Application Information for suggested value and type.

Figure 19. Adding High-Frequency Bypass Capacitors to the Input and Output

π Filters

If a further reduction in ripple/noise level is required for an application, higher order filters must be used. A π (pi)

filter, employing a ferrite bead (Fair-Rite Pt. No. 2673000701 or equivalent) in series with the input or output

terminals of the regulator reduces the ripple/noise by at least 20 db (see Figure 20 and Figure 21). In order for

the inductor to be effective in reduction of ripple and noise-ceramic capacitors are required. (See Capacitor

Recommendations for the PTN78020A for additional information on vendors and component suggestions.)

These inductors plus ceramic capacitors form an excellent filter because of the rejection at the switching

frequency (650 kHz - 1 MHz). The placement of this filter is critical. It must be located as close as possible to the

input or output pins to be effective. The ferrite bead is small (12,5 mm × 3 mm), easy to use, low cost, and has

low dc resistance. Fair-Rite also manufactures a surface-mount bead (part number 2773021447), through hole

(part number 2673000701) rated to 5 A. 1-μH to 5-μH inductors can be used in place of the ferrite inductor bead.

14

PTN78020A

www.ti.com

SLTS244A–APRIL 2005–REVISED MAY 2005

L1

1 - 5 mH

L2

1 - 5 mH

V

O

2

1, 7

I

PTN78020A

V

O

I

GND

Adjust

6

4

#

C5

C1

1 mF

Ceramic

C2

C3*

C4

?

C6

1 mF

Ceramic

R

100 mF

18.8 mF

SET

100 mF

(Required)

Electrolytic

(Required)

Ceramic

(Required)

GND

* See the specifications for required value and type.

# See the Application Information for suggested value and type.

? Recommended for applications with load transients.

Figure 20. Adding π Filters (I_O≤ 4 A)

45

40

35

1 MHz

30

25

20

15

10

600 kHz

0

0.5

1

1.5

2

2.5

3

Load Current ? A

Figure 21. π-Filter Attenuation vs. Load Current

15

PACKAGE OPTION ADDENDUM

www.ti.com

19-Aug-2005

PACKAGING INFORMATION

Orderable Device

PTN78020AAH

PTN78020AAS

PTN78020AAST

PTN78020AAZ

PTN78020AAZT

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

DIP MOD

ULE

EUK

7

20

TBD

Call TI

Level-1-235C-UNLIM

Level-3-260C-168 HR

DIP MOD

ULE

EUL

20

DIP MOD

ULE

200

20

DIP MOD

ULE

Pb-Free

(RoHS)

DIP MOD

ULE

200

Pb-Free

(RoHS)

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 1

IMPORTANT NOTICE

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enhancements, improvements, and other changes to its products and services at any time and to discontinue

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TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

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TI assumes no liability for applications assistance or customer product design. Customers are responsible for

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Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

www.ti.com/audio

Data Converters

dataconverter.ti.com

Automotive

www.ti.com/automotive

DSP

dsp.ti.com

Broadband

Digital Control

Military

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/military

Interface

Logic

interface.ti.com

logic.ti.com

Power Mgmt

Microcontrollers

power.ti.com

Optical Networking

Security

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

microcontroller.ti.com

Telephony

Video & Imaging

Wireless

www.ti.com/wireless

Mailing Address:

Texas Instruments

Post Office Box 655303 Dallas, Texas 75265

型號:	PTN78020AAZ
Brand Name：	Texas Instruments
是否Rohs認證：	不符合
生命周期：	Active
IHS 制造商：	TEXAS INSTRUMENTS INC
零件包裝代碼：	MODULE
包裝說明：	MODULE-7
Reach Compliance Code：	compliant
ECCN代碼：	EAR99
HTS代碼：	8504.40.95.80
Factory Lead Time：	1 week
風(fēng)險等級：	1.57
Is Samacsys：	N
模擬集成電路 - 其他類型：	DC-DC REG PWR SUPPLY MODULE
最大輸入電壓：	29 V
最小輸入電壓：	9 V
標稱輸入電壓：	20 V
JESD-30 代碼：	R-PDMA-X7
JESD-609代碼：	e1
長度：	37.97 mm
最大負載調(diào)整率：	25%
濕度敏感等級：	3
功能數(shù)量：	1
輸出次數(shù)：	1
端子數(shù)量：	7
最高工作溫度：	85 °C
最低工作溫度：	-40 °C
最大輸出電壓：	-3 V
最小輸出電壓：	-15 V
封裝主體材料：	PLASTIC/EPOXY
封裝形狀：	RECTANGULAR
封裝形式：	MICROELECTRONIC ASSEMBLY
峰值回流溫度（攝氏度）：	260
認證狀態(tài)：	Not Qualified
座面最大高度：	9 mm
表面貼裝：	NO
技術(shù)：	HYBRID
溫度等級：	INDUSTRIAL
端子面層：	Tin/Silver/Copper (Sn/Ag/Cu)
端子形式：	UNSPECIFIED
端子位置：	DUAL
處于峰值回流溫度下的最長時間：	NOT SPECIFIED
微調(diào)/可調(diào)輸出：	YES
寬度：	22.1 mm
Base Number Matches：	1

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