nx2142 Microsemi Corporation, nx2142 Datasheet - Page 5

• Manufacturer Part Number: nx2142
• Description: Single Channel Pwm Controller With Feedforward And 5v Bias Regulator
• Manufacturer: Microsemi Corporation

BLOCK DIAGRAM
Rev. 1.1
10/28/07
COMP
GND
VCC
FB
VIN
6V/
5.5V
START
Generator
COMP
Digital
start Up
0.3V
Bias
4.4/4.2V
0.8V
START
Figure 2 - Simplified block diagram of the NX2142
ramp
1.25V
0.8V
OSC
VIN
0.6V
CLAMP
Ref
UVLO
1.3V
CLAMP
S
R
Q
POR
OC
START
POR
Hiccup Logic
PWM
OC
OCP
comparator
SS_half_done
Control
Logic
NX2142/2142A
VCC
70%*Vp
320mV
FB
Regout
HDRV
SW
LDRV
BST
5