RT9244 데이터 시트보기 (PDF) - Richtek Technology

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RT9244

Multi-Phase PWM Controller for CPU Core Power Supply

Richtek Technology 

3-Phase Converter and Components Function Grouping

RT9244

Compensation

& Offset

VID

OVP

PGOOD

Droop Setting

12V

Driver Power

UVLO

DAC Offset

Voltage Setting

Frequency

Setting

SGND

VSEN

VDIF

PWM1

ISP1

ISN1

RT9244

COMP

FB

PWM2

ADJ

DVD

ISP2

ISN2

VOSS

SS,SS2

ISP3

ISN3

PWM3

RT

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

12V

VCORE

Current Sense

Components

Design Procedure Suggestion

Voltage Loop Setting

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 < 60μA at full load condition for better

load line linearity).

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

keep ISPx current < 100μA at OCP condition for

precision issue).

DS9244-06 March 2007

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.

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