RT9248A データシートの表示（PDF） - Richtek Technology

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RT9248A

Multi-Phase PWM Controller for CPU Core Power Supply

Richtek Technology 

RT9248A

Preliminary

3-Phase Converter and Components Function Grouping

12V

Compensation

& Offset

VID

PGOOD

Droop Setting

12V

Driver Power

UVLO

DAC Offset

Voltage Setting

OCP Setting

SGND

VSEN

VDIF

PWM1

ISP1

RT9248A

COMP

FB

PWM2

ADJ

DVD

VOSS

SS

ISP2

ISN

ISP3

PWM3

IMAX

GND

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

RDS(ON), ISPx & ISN pin external resistor value,

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).

VCC

BST

DRVH

SW

RT9603

IN

DRVL

PGND

12V

VCC

BST

DRVH

SW

RT9603

IN

DRVL

PGND

VCORE

VCC

BST

DRVH

SW

RT9603

IN

DRVL

PGND

12V

Current Sense

Components

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.

www.richtek.com

10

DS9248A-06 March 2006

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