RT8855 데이터 시트보기 (PDF) - Richtek Technology

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RT8855

4/3/2/1-Phase PWM Controller for AMD AM2/AM2+ CPUs

Richtek Technology 

RT8855

Function Block Diagram

RT

COMP

FB

OFS

PGOOD

PWROK

EN

VID5 to VID0

FBRTN

FBRTN_NB

ADJ

IMAX

IMAX_NB

Modulator

Waveform

Generator

-

+EA

RAMP_NB

POR

Power-On

Reset

Offset

+

OV

-

+

1.8V

Transient

Response

Enhancement

OV

OC

VIDOFF

POR

+

-

+

1.25V

Soft Start

and

Fault

Logic

+

-

+

-

+

-

+

-

-

VID

Table

-

Generator

OC

Detection

OC

OC_NB

Detection

OC_NB

-

AVG

-

-

COMP_NB

FB_NB

+

-

+

1.8V

Transient

Response

Enhancement

-

EA

+

+

RAMP_NB

-

OV_NB

5V

Regulator

MOSFET

Driver

VCC12

VCC5

BOOT1

UGATE1

PHASE1

LGATE1

MOSFET

Driver

CH3_EN

Detector

CH4_EN

Detector

I_SEN1

CH1

Current

SENSE

I_SEN2 CH2

Current

SENSE

CH3

I_SEN3 Current

SENSE

I_SEN4 CH4

Current

SENSE

I_SENNB NB

Current

SENSE

MOSFET

Driver

BOOT2

UGATE2

PHASE2

LGATE2

PWM3

PWM4

PS

ISP1

ISN1

ISP2

ISN2

ISP3

ISN3

ISP4

ISN4

ISP_NB

ISN_NB

VCC12_NB

BOOT_NB

UGATE_NB

PHASE_NB

LGATE_NB

www.richtek.com

6

DS8855-01 April 2011

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