SC453 Просмотр технического описания (PDF) - Semtech Corporation

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SC453

Portable, VID Programmed Single Phase Power Supply Controller

Semtech Corporation 

SC453

POWER MANAGEMENT

Pin CDoensficgriuprtaiotinosn(Cont.)

Pin#

Pin Name Pin Function

11

VID3

VID input.

12

VID2

VID input.

13

VID1

VID input.

14

VID0

VID least significant bit main controller voltage programming DAC input.

15

SS

Soft-start. An external cap defines the soft-start ramp.

Delayed power good - open drain output. When the Main Converter Output approaches

16

PG_DEL

and stays within ± 14% of the VID_DAC setting, and the tCPU_PWRGD period has terminated.

This signal is pulled high by an external resistor.

17

CORE

Main CORE converter output feedback to the power good generator. A small RC filter

should be used to filter out any HF component to prevent faulty trip condition.

18

DAC

Main controller digital-to-analog output.

19

GND

Analog ground.

20

REFIN

Core Comparator reference input pin. Connect to DAC.

21

VCCA

5V supply for precision analog circuitry.

22

CLRF

Current limit reference input pin

23

CMP

Core Comparator input pin.

24

CL

Current limit input pin.

25

EN

Enable - active high. This is capable of accepting a 5.0V signal level.

26

PGND

Power ground. Connect to the synchronous FET power ground.

27

BG

Output drive for the synchronous (low-side) FET.

28

V5

5VDC supply for the driver. A capacitor should be connected from V5 to GND.

© 2006 Semtech Corp.

9

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