L296 Просмотр технического описания (PDF) - STMicroelectronics

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L296

HIGH CURRENT SWITCHING REGULATORS

STMicroelectronics 

L296 - L296P

PIN FUNCTIONS

N°

Name

Function

1 CROWBAR INPUT Voltage Sense Input for Crowbar Overvoltage Protection. Normally connected to the

feedback input thus triggering the SCR when V out exceeds nominal by 20 %. May

also monitor the input and a voltage divider can be added to increase the threshold.

Connected to ground when SCR not used.

2

OUTPUT

Regulator Output

3 SUPPLY VOLTAGE Unrergulated Voltage Input. An internal Regulator Powers the L296s Internal Logic.

4

CURRENT LIMIT A resistor connected between this terminal and ground sets the current limiter

threshold. If this terminal is left unconnected the threshold is internally set (see

electrical characteristics).

5

SOFT START

Soft Start Time Constant. A capacitor is connected between this terminal and ground

to define the soft start time constant. This capacitor also determines the average

short circuit output current.

6

INHIBIT INPUT TTL – Level Remote Inhibit. A logic high level on this input disables the device.

7

SYNC INPUT

Multiple L296s are synchronized by connecting the pin 7 inputs together and omitting

the oscillator RC network on all but one device.

8

GROUND

Common Ground Terminal

9

FREQUENCY

A series RC network connected between this terminal and ground determines the

COMPENSATION regulation loop gain characteristics.

10 FEEDBACK INPUT The Feedback Terminal on the Regulation Loop. The output is connected directly to

this terminal for 5.1V operation ; it is connected via a divider for higher voltages.

11

OSCILLATOR

A parallel RC networki connected to this terminal determines the switching frequency.

This pin must be connected to pin 7 input when the internal oscillator is used.

12

RESET INPUT Input of the Reset Circuit. The threshold is roughly 5 V. It may be connected to the

feedback point or via a divider to the input.

13

RESET DELAY A capacitor connected between this terminal and ground determines the reset signal

delay time.

14 RESET OUTPUT Open collector reset signal output. This output is high when the supply is safe.

15 CROWBAR OUTPUT SCR gate drive output of the crowbar circuit.

BLOCK DIAGRAM

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