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PTH04T240/241W

(Top View)

PTH04T240W, PTH04T241W

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

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

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The regulated positive power output with respect to GND.

GND

3, 4

control inputs.

The Inhibit pin is an open-collector/drain, negative logic input that is referenced to GND. Applying a low level

ground signal to this input disables the module’s output and turns off the output voltage. When the Inhibit control

is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the

module produces an output whenever a valid input source is applied.

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UVLO

This pin is also used for input undervoltage lockout (UVLO) programming. Connecting a resistor from this pin to

GND (pin 3) allows the ON threshold of the UVLO to be adjusted higher than the default value. For more

information, see the Application Information section.

A 0.05 W 1% resistor must be connected between this pin and pin7 (–Sense), close to the module to set the

output voltage to a value higher than 0.69V. The temperature stability of the resistor should be 100 ppm/°C (or

better). The setpoint range for the output voltage is from 0.69V to 3.6V. If left open circuit, the output voltage will

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default to its lowest value. For further information, on output voltage adjustment see the related application note.

The specification table gives the preferred resistor values for a number of standard output voltages.

The sense input allows the regulation circuit to compensate for voltage drop between the module and the load.

+ Sense

6

The sense input allows the regulation circuit to compensate for voltage drop between the module and the load.

– Sense

7

For optimal voltage accuracy –Sense must be connected to GND (pin4) very close to the module (within 10cm).

This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes

active typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage

from 0 V up to the nominal set-point voltage. Within this range the module's output voltage follows the voltage at

Track

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the Track pin on a volt-for-volt basis. When the control voltage is raised above this range, the module regulates

at its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules powered

NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input voltage

during power up. For more information, see the related application note.

This input pin adjusts the transient response of the regulator. To activate the TurboTrans™ feature, a 1%, 50mW

resistor must be connected between this pin and pin 6 (+Sense) very close to the module. For a given value of

output capacitance, a reduction in peak output voltage deviation is achieved by utililizing this feature. If unused,

TurboTrans™

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this pin must be left open-circuit. The resistance requirement can be selected from the TurboTrans™ resistor

table in the Application Information section. External capacitance must never be connected to this pin unless the

TurboTrans resistor value is a short, 0

Ω.

This input pin sychronizes the switching frequency of the module to an external clock frequency. The SmartSync

feature can be used to sychronize the switching fequency of multiple PTH04T240/241W modules, aiding EMI

SmartSync

1

noise suppression efforts. If unused, this pin should be connected to GND (pin3). For more information, please

review the Application Information section.

(1)

Denotes negative logic: Open = Normal operation, Ground = Function active

Copyright © 2006–2009, Texas Instruments Incorporated

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Product Folder Link(s): PTH04T240W PTH04T241W