PTN78000HAS datasheet(4/25 Pages) TI

Part #	PTN78000HAS

Description	1.5-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR

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Manufacturer	TI [Texas Instruments]

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ELECTRICAL CHARACTERISTICS

PTN78000W, PTN78000H

SLTS230C – NOVEMBER 2004 – REVISED SEPTEMBER 2008...................................................................................................................................... www.ti.com

operating at 25°C free-air temperature, VI = 24 V, VO = 12 V, IO = IO (max), CI = 2× 4.7 µF, CO = 100 µF (unless otherwise

noted)

PTN78000H

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VO = 12 V

0.1

1.5

IO

Output current

TA = 85°C, natural convection airflow

VO = 15 V

0.1

1.5 (1)

A

VO = 22 V

0.1

1 (1)

VI

Input voltage range

Over IO range

15 (2)

36

V

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

±3% (3)

variation

–40°C < TA < 85°C

VI < 19 V

11.85

VI – 3

Output voltage adjust

19 V

≤ VI ≤ 25 V

11.85

VI – 4

VO Adj

V

range

VI > 25 V

11.85

22

VI = 24 V, RSET = 383 k Ω, VO = 12 V

91%

η

Efficiency

VI = 24 V, RSET = 15 kΩ, VO = 15 V

93%

VI = 32 V, RSET = 95.3 Ω, VO = 22 V

94%

Output voltage ripple

20 MHz bandwith

1% VO

V(PP)

IO (LIM)

Current limit threshold

ΔVO = –50 mV, minimum VI

2× IO(max)

A

1 A/µs load step from 50% to 100% IOmax

Transient response

Recovery time

200

µs

VO over/undershoot

1

%VO

VI increasing

12.2

UVLO

Undervoltage lockout

V

VI decreasing

12

Input high voltage (VIH)

1

Open (4)

V

Inhibit control (pin 3)

Input low voltage (VIL)

–0.1

0.3

Input low current (IIL)

0.25

mA

II (STBY)

Input standby current

Pin 3 connected to GND

17

mA

FS

Switching frequency

Over VI and IO ranges

440

550

660

kHz

CI

External input capacitance

Ceramic

9.4 (5)

µF

Nonceramic

100 (6)

µF

External output

CO

Ceramic

200

capacitance

Equiv. series resistance (nonceramic)

10 (7)

m

Ω

Per Telcordia SR-332, 50% stress,

MTBF

Calculated reliability

8.9

106 Hr

TA = 40°C, ground benign

(1)

The maximum output current is 1.5 A or the maximum output power is 22.5 W, whichever is less.

(2)

For output voltages less than 19 V, the minimum input voltage is 15 V or (VO + 3) V, whichever is greater. For output voltages of 19 V

and higher, the minimum input voltage is (VO + 4) V. See the Application Information section for further guidance.

(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 with 100 ppm/°C or better temperature stability.

(4)

This control pin has an internal pullup, and if left open circuit, the module operates when input power is applied. The open-circuit voltage

is typically 1.5 V. A small, low-leakage (< 100 nA) MOSFET is recommended for control. See the Application Information section for

further guidance.

(5)

Two external 4.7-µF ceramic capacitors are required across the input (VI and GND) for proper operation. Locate the capacitor close to

the module.

(6)

100 µF of output capacitance is required for proper operation. See the Application Information section for further guidance.

(7)

This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m

Ω as the minimum when using maximum ESR values

to calculate.

4

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