nx4108 Microsemi Corporation, nx4108 Datasheet - Page 4

• Manufacturer Part Number: nx4108
• Description: 1a Synchronous Buck Switcher With Fet On Board
• Manufacturer: Microsemi Corporation

BLOCK DIAGRAM
Rev. 1.7
12/30/09
FB
EN
start
VIN
Soft start
POR
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Vref
1Mohm
CLK
Hiccup
timer
20pF
Figure 2 - Simplified block diagram of the NX4108
OCPB
PWM comparator
3 cycle
counter
OSC
Analog Mixed Signal Group
POR
Microsemi
70ns
one shot
S
reset dom
R
OCPB
Q
Thermal
POR
Shutdown
VIN
UVLO
PWM
LDen
Vref
Control
Logic
Bias
Generator
+
-
NX4108
GND
SW
VIN
4