RT9241A RICHTEK [Richtek Technology Corporation], RT9241A Datasheet - Page 13

• Manufacturer Part Number: RT9241A
• Description: Two-Phase DC/DC Controller for CPU Core Power Supply
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Compensation
Droop Setting
Driver Power
& Offset
UVLO
Two-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 network
Current loop setting
a.Over current protection trip point setting by GM amplifier
VRM load line setting
a.Droop amplitude (ADJ pin resistor)
b.No load offset (additional resistor in compensation
DS9241AB-05 March 2007
value & ESR)
S/H current(current sense component Ron, ISPx &
ISNx pin external resistor value, keep ISPx current =
75μA at OCP condition)
network)
12V
VID
COMP
FB
ADJ
DVD
SS
VSEN
RT9241A/B
VDD
+5V
PWM1
PWM2
ISN1
ISN2
ISP1
ISP2
GND
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
PVCC
PWM
PVCC
PWM
VCC
VCC
RT9600
RT9600
GND
GND
BOOT
UGATE
BOOT
UGATE
PHASE
PHASE
LGATE
LGATE
RT9241A/B
12V
12V
www.richtek.com
Current Sense
Components
13
+V
CORE