RT9237 Просмотр технического описания (PDF) - Unspecified

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RT9237

Multi-Phase DC/DC Controller for CPU Core Power Supply

Unspecified 

RT9237

Preliminary

3-Phase Converter and Components Function Grouping

Compensation

& Offset

Droop Setting

12V

Driver Power

UVLO

Ramp Setting

OCP Setting

+5V

VDD

VID

PWM1

ISP1

ISN1

COMP

FB

VSEN

ADJ

PWM2

RT9237

DVD

ISP2

ISN2

IRMP

PWM3

SS

ISP3

IMAX

ISN3

GND

VCC BOOT

PVCC UGATE

PHASE

RT9600

PWM LGATE

GND

VCC BOOT

PVCC UGATE

PHASE

RT9600

PWM LGATE

GND

VCC BOOT

PVCC UGATE

PHASE

RT9600

PWM LGATE

GND

12V

12V

+VCORE

12V

Current Sense

Components

Design Procedure Suggestion

Voltage Loop setting

a. Output filter pole and zero (Inductor, output

capacitor value & ESR)

b. Error amplifier compensation & saw-tooth wave

amplitude(compensation network & IRMP pin

resistor)

Current loop setting

a. GM amplifier S/H current(current sense

component Ron, ISPx & ISNx pin external resistor

value, keep ISPx current < 50uA at full load

condition)

www.richtek-ic.com.tw

10

b. Over current protection trip point(IMAX pin

resistor, keep ISPx current<80uA at OCP

condition)

VRM load line setting

a. Droop amplitude (ADJ pin resistor)

b. No load offset(additional resistor in compensation

network)

Power sequence & SS

DVD pin external resistor and SS pin capacitor

PCB layout

a. Kelvin sense for current sense GM amplifier

input

b. Refer to layout guide for other item

DS9237-00 January 2002

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