rt9246 Richtek Technology Corporation, rt9246 Datasheet - Page 13

• Manufacturer Part Number: rt9246
• Description: Multi-phase Controller Core Power Supply
• Manufacturer: Richtek Technology Corporation

3-Phase Converter and Components Function Grouping
Design Procedure Suggestion
Voltage Loop Setting
a. Output filter pole and zero (Inductor, output capacitor
b. Error amplifier compensation & sawtooth wave amp-
c. Kelvin sense for V
Current Loop Setting
a. GM amplifier S/H current (current sense component
b. Over-current protection trip point (IMAX pin resistor,
DS9246-06 March 2007
value & ESR).
litude (compensation network).
R
ISPx current < 60μA at full load condition for better
load line linearity).
keep ISPx current < 90μA at OCP condition for
precision issue).
DS(ON)
Compensation
Voltage Setting
Droop Setting
DAC Offset
Driver Power
OCP Setting
, ISPx & ISNx pin external resistor value, keep
& Offset
UVLO
12V
CORE
PGOOD
.
VID
SS, SS2
SS2
SGND
VSEN
VDIF
COMP
FB
ADJ
DVD
VOSS
IMAX
RT9246
GND
PWM2
PWM3
PWM1
ISN23
ISP2
ISP3
ISN1
ISP1
VRM Load Line Setting
a. Droop amplitude (ADJ pin resistor).
b. No load offset (additional resistor in compensation
c. DAC offset voltage setting (VOSS pin & compen sation
Power Sequence & SS
PCB Layout
a. Kelvin sense for current sense GM amplifier input.
b. Refer to layout guide for other item.
DVD pin external resistor and SS pin capacitor.
IN
IN
IN
VCC
VCC
VCC
network).
network resistor).
RT9603
RT9603
RT9603
PGND
PGND
PGND
DRVH
DRVH
DRVH
DRVL
DRVL
DRVL
BST
BST
BST
SW
SW
SW
12V
12V
12V
Current Sense
Components
RT9246
www.richtek.com
V
CORE
13