L4964 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L4964

HIGH CURRENT SWITCHING REGULATOR

STMicroelectronics 

L4964

PIN FUNCTIONS

N°

Name

1

N.C.

2

Output

3

Supply Voltage

4

N.C.

5

Soft Start

6

Inhibit Input

7

Sync Input

8

Ground

9

Frequency

Compensation

10

Feedback

Input

11

Oscillator

12

Reset Input

13

Reset Delay

14

Reset Output

15

N.C.

Function

Must not be connected. Leave open circuit.

Regulator Output.

Unregulated Voltage Input. An internal regulator powers the L4964’s internal logic.

Must not be connected. Leave open circuit.

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.

TTL - Level Remote Inhibit. A logic high level on this input disables the L4964.

Multiple L4964’s are synchronized by connecting the pin 7 inputs together and omitting

the oscillator RC network on all but one device.

Common Ground Terminal.

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

regulation loop gain characteristics.

The Feedback Terminal of the Regulation Loop. The output is connected directly to

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

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

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

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

beedback point or via a divider to the input.

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

delay time.

Open Collector Reset Signal Output. This output is high when the supply is safe.

Must not be connected. Leave open circuit.

BLOCK DIAGRAM

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