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DEVICE INFORMATION

PTHXX030

(Top View)

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PTH12030W/L

SLTS211F – MAY 2003 – REVISED FEBRUARY 2007

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

GND

1,3,7,10

reference for the control inputs.

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

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.

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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.

A 1% resistor must be directly connected between this pin and pin 7 (GND) to set the output voltage to

a value higher than 0.8 V. The temperature stability of the resistor should be 100 ppm/

°C (or better).

The set point range for the output voltage is from 1.2 V to 5.5 V for W-suffix devices, and 0.8 V to 1.8

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V for L-suffix devices. The resistor value required for a given output voltage may be calculated using a

formula. If left open circuit, the module output voltage defaults to its lowest value. For further

information on output voltage adjustment, see the related application information section. Table 3 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

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disconnected.

8,9

The regulated positive power output with respect to the GND node.

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 output will follow

the voltage at the Track pin on a volt-for-volt basis. When the control voltage is raised above this

Track

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range, the module regulates at its set-point voltage. The feature allows the output voltage to rise

simultaneously with other modules powered from the same input bus. If unused, this input should be

its own input voltage during power up. For more information, see the related application information

section.

When this input is asserted to GND, the output voltage is decreased by 5% from the nominal. The

input requires an open-collector (open-drain) interface. It is not TTL compatible. A lower percent

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change can be accomodated with a series resistor. For further information, see the related application

information section.

When this input is asserted to GND, the output voltage is increased by 5%. The input requires an

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open-collector (open-drain) interface. It is not TTL compatible. The percent change can be reduced

with a series resistor. For further information, see the related application information section.

(1)

Denotes negative logic:

Open = Normal operation

Ground = Function active

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