PTN78020AAZ datasheet(3/19 Pages) TI

Part #	PTN78020AAZ

Description	25-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE REGULATOR MODULE

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ELECTRICAL CHARACTERISTICS

PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 2005

operating at 25°C free-air temperature, V

I = 20 V, VO = –5 V, IO = IO (max), CI = 100 µF and 4x 4.7 µF, CO = 100 µF (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VO = -3 V

0.1

4 (1)

VO = -5 V

0.1

4 (1)

TA = 25°C, natural convec-

IO

Output current

A

tion airflow

VO = -12 V

0.1

2.1 (1)

VO = -15 V

0.1

1.67 (1)

VO = -3 V

9

29 (2)

VO = -5 V

9

27 (2)

VI

Input voltage range

Over IO range

V

VO = -12 V

9

20 (2)

VO = -15 V

9

17 (2)

Set-point voltage tolerance

TA = 25°C

±2%(3)

Temperature variation

-40°C to +85°C

-0.5%

Line regulation

Over VI range

-10

mV

VO

Load regulation

Over IO range

-10

mV

Includes set point, line, load

Total output voltage variation

-3% (3)

-40 < TA < 85°C

VO (adj)

Output voltage adjust range

9 V

≤ V

I ≤ (32 – |VO|) V

-15

- 3

V

VI = 12 V, RSET = 100 Ω, VO = –15 V

87%

VI = 12 V, RSET = 2 kΩ, VO = –12 V

86%

η

Efficiency

VI = 20 V, RSET = 28.7 kΩ, VO = –5 V

82%

VI = 24 V, RSET = 221 kΩ, VO = –3.3 V

77%

Output voltage ripple

20-MHz bandwidth

1% VO

V(PP)

IO (LIM)

Current limit threshold

∆V

O = –50 mV

8.5

A

1 A/µs load step from 50% to 100%

IOmax

Transient response

Recovery time

200

µs

VO over/undershoot

5

%VO

FS

Switching frequency

Over VI and IO ranges

440

550

660

kHz

UVLO

Undervoltage lockout

VI increasing

5.5

V

Ceramic

18.8 (4)

CI

External input capacitance

µF

Nonceramic

100 (4)

Ceramic

200

µF

CO

External output capacitance

Nonceramic

100 (5)

2,000

Equivalent series resistance (nonceramic)

10 (6)

m

Ω

Per Telcordia SR-332, 50% stress,

MTBF

Calculated reliability

5.6

106 Hrs

TA = 40°C, ground benign

(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 – |VO|) volts.

(3)

The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has 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 (VI and 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

Ω as the minimum when using max-ESR values to

calculate.

3

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