FAN5235 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN5235

System Electronics Regulator for Mobile PCs

Fairchild Semiconductor 

FAN5235

CLK

HI

GATE

LOGIC

PWM

LO

ADAPTIVE GATE

CONTROL

VCC

VFB

ISEN

VREF

LSD

ERROR AMP

REF

DUTY

CYCLE

CLAMP

LSD

OC DETECT

VCC

SET

QD

CLK

Q CLR L

PWM LATCH

SUM

PWM

RAMP

CURRENT SENSE

AMP

FAN5235

5V/3.3V Switcher

5V

VIN

CPUMP

HSD

PHASE

ISEN

LSD

VFB

L1

VOUT

CL

PGND

Figure 1. FAN5235 5V/3.3V Internal Block Diagram of PWM Loop

Vout

VFB12

6

CK :3

CK :3

Ve

Ramp

PWM

VREF=2.5V

R

Ramp

16R

–

+

Ve

FAN5235

12V Converter

CLK:3

(30%DC, 100kHz)

S

+

–

PWM

R

CLK:3

Q

Q

DISABLE

Figure 2. FAN5235 12V Internal Block Diagram

+5

SW12

V out

REV. 1.3.3 1/3/02

Share Link: