Datasheet

PTN78020
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1
2
7
6
543
PTN78020W
PTN78020H
www.ti.com SLTS228C – DECEMBER 2004– REVISED AUGUST 2011
PIN ASSIGNMENT
TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTION
NAME NO.
This is the common ground connection for the V
I
and V
O
power connections. It is also the 0-V
dc
reference
GND 1, 7
for the Inhibit and V
O
Adjust control inputs.
V
I
2 I The positive input voltage power node to the module, which is referenced to common GND.
The Inhibit pin is an open-collector/drain active-low 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
Inhibit 3 I
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 connected between this pin and GND (pin 7) to set the output voltage of the
module. If left open-circuit, the output voltage is set to its default value. The temperature stability of the
V
O
Adjust 4 I
resistor should be 100 ppm/°C (or better). The standard resistor value for a number of common output
voltages is provided in the application information.
The sense input allows the regulation circuit to compensate for voltage drop between the module and the
V
O
Sense 5 I load. For optimum voltage accuracy, V
O
Sense should be connected to V
O
. If the
sense feature is not used, this pin may be left disconnected.
V
O
6 O The regulated positive power output with respect to the GND node.
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