SC4612 查看數據表（PDF） - Semtech Corporation

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SC4612

Wide Input Range High Performance Synchronous Buck Switching Controller

Semtech Corporation 

SC4612

POWER MANAGEMENT

Block Diagram

VDD

DRV

GND

OSC

ILIM

SS/EN

INTERNAL REGULATOR

&

BANDGAP GENERATOR

Oscillator

900mV

Current

Limit

SOFT START

&

SS

Enable

TOP Side

Gate Driver

OVP

PWM

BST

DH

PHASE

OVP

PWM Control OCP

EN

SYNC

Q

SR

OCP

Low Side

Gate Driver

-+

PWM

Synchronous

Mode

VCC

DL

GND

Error

- Amp.

+

FB

SS

REF

BST

DH

PHASE

DL

FB

EAO

Over Voltage Protection

FB +

600mV

-

20% OVP

PWM

Enable

SQ

R

Low Side 100% on

Top Side off

Vcc UVLO

Vcc

UVLO

SS

+

-

800mV

PWM

Enable

PWM

Disable

OCP @ Asynchronous Start up

EAO > FB + 0.7

for more than 10

cycles

True

False

Soft Start

Cycle

Allow

Synchronous

mode

Synchronous

Mode

FB +

Vref

-

Low Side

Rdson OCP

PWM

Enable

SQ

R

PWM

Disable

PWM

Enable

SQ

R

SS +

Vref+0.5

-

 2007 Semtech Corp.

8

www.semtech.com

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