nx2155h Microsemi Corporation, nx2155h Datasheet - Page 5

• Manufacturer Part Number: nx2155h
• Description: Single Power Supply Synchronous Pwm Controller
• Manufacturer: Microsemi Corporation

BLOCK DIAGRAM
Rev.1.1
04/16/09
5VREG
COMP
VIN
GND
RT
FB
START
Generator
Digital
start Up
Bias
0.8V
Regulator
COMP
0.3V
5V
START
Figure 2 - Simplified block diagram of the NX2155H
ramp
1.25V
0.8V
OSC
0.6V
CLAMP
UVLO
UVLO
1.3V
CLAMP
S
R
Q
POR
OC
OVP
Hiccup Logic
START
START
Thermal
Shutdown
Latch
PWM
Control
Logic
SS_done
VCC
VCC
NX2155H
0.6V
FB
HDRV
SW
LDRV
BST
OCP
5