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RT9246PC 数据表(PDF) 13 Page - Richtek Technology Corporation

部件名 RT9246PC
功能描述  Multi-Phase PWM Controller for CPU Core Power Supply
PDF  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT9246PC 数据表(HTML) 13 Page - Richtek Technology Corporation

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RT9246
13
DS9246-06
March 2007
www.richtek.com
3-Phase Converter and Components Function Grouping
PWM1
ISP1
RT9246
COMP
FB
ADJ
ISN1
PWM2
ISP2
GND
VOSS
DVD
ISN23
PWM3
IMAX
SS, SS2
ISP3
12V
V
CORE
12V
VID
Compensation
& Offset
Droop Setting
Driver Power
UVLO
DAC Offset
Voltage Setting
OCP Setting
SGND
VSEN
VDIF
VCC
IN
PGND
BST
DRVH
SW
DRVL
RT9603
12V
12V
Current Sense
Components
PGOOD
VCC
IN
PGND
BST
DRVH
SW
DRVL
RT9603
VCC
IN
BST
DRVH
SW
DRVL
RT9603
PGND
SS2
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 & 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 (IMAX pin resistor,
keep ISPx current < 90
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.



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