RT9248 데이터 시트보기 (PDF) - Richtek Technology

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RT9248

Multi-Phase PWM Controller for CPU Core Power Supply

Richtek Technology 

RT9248

Preliminary

3-Phase Converter and Components Function Grouping

12V

VCC

BST

DRVH

SGND

VSEN

VDIF

PWM1

SW

RT9603

IN

DRVL

PGND

VID

PGOOD

12V

ISP1

ISN1

VCC

BST

Compensation

& Offset

RT9248

COMP

DRVH

SW

RT9603

FB

PWM2

IN

DRVL

PGND

ADJ

Droop Setting

ISP2

ISN23

12V

Driver Power

UVLO

DAC Offset

Voltage Setting

DVD

12V

VOSS

SS

ISP3

PWM3

VCC

BST

DRVH

OCP Setting

IMAX

GND

SW

RT9603

IN

DRVL

PGND

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

R , ISPx & ISNx pin external resistor value,

DS(ON)

keep ISPx current < 60μA at full load condition for

better load line linearity).

b. Over-current protection trip point (IMAX pin resistor,

keep ISPx current < 90μA at OCP condition for

precision issue).

www.richtek.com

10

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.

DS9248-05 March 2007

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