nx2119 Microsemi Corporation, nx2119 Datasheet - Page 5

• Manufacturer Part Number: nx2119
• Description: Synchronous Pwm Controller With Current Limit Protection
• Manufacturer: Microsemi Corporation

BLOCK DIAGRAM
Rev.3.2
04/10/08
COMP
VCC
GND
FB
START
COMP
0.3V
Generator
Digital
start Up
Bias
0.8V
START
Figure 2 - Simplified block diagram of the NX2119
ramp
1.25V
0.8V
OSC
0.6V
CLAMP
UVLO
1.3V
CLAMP
S
R
0.6V
FB
Q
POR
OC
START
latch out
PWM
Hiccup Logic
OC
Control
Logic
OCP
comparator
NX2119/2119A
VCC
320mV
SW
LDRV
HDRV
BST
5