RT9243GS datasheet(14/18 Pages) RICHTEK

14 / 18 page

RT9243

DS9243-07 March 2007

www.richtek.com

3-Phase Converter and Components Function Grouping

Design Procedure Suggestion

a. Output filter pole and zero (Inductor, output capacitor

value & ESR).

b. Error amplifier compensation & sawtooth wave amp-

litude (compensation network).

c. Kelvin sense for VCORE.

Current Loop Setting

a. GM amplifier S/H current (current sense component

Ron, ISPx & ISNx pin external resistor value, keep

ISPx current < 60

μA at full load condition for better

load line linearity).

b. Over-current protection trip point (Internal setting,

keep ISPx current < 100

μA at OCP condition for

precision issue).

VRM Load Line Setting

a. Droop amplitude (ADJ pin resistor).

b. No load offset (additional resistor in compensation

network).

c. DAC offset voltage setting (VOSS pin & compen-

sation network resistor).

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.

Voltage Loop Setting

PWM1

ISP1

RT9243

COMP

ADJ

ISN1

PWM2

ISP2

GND

VOSS

DVD

ISN2

PWM3

ISP3

12V

VCC

PWM

GND

BOOT

UGATE

PHASE

LGATE

RT9600

CORE

12V

VID

Compensation

& Offset

Droop Setting

Driver Power

UVLO

DAC Offset

Voltage Setting

Frequency

Setting

SGND

VSEN

VDIF

PVCC

VCC

PWM

GND

BOOT

UGATE

PHASE

LGATE

RT9600

PVCC

VCC

PWM

GND

BOOT

UGATE

PHASE

LGATE

RT9600

PVCC

12V

ISN3

Current Sense

Components

OVP

PGOOD

RT9243GS Datasheet(PDF) 14 Page - Richtek Technology Corporation

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