nx2154 Microsemi Corporation, nx2154 Datasheet - Page 5
nx2154
Manufacturer Part Number
nx2154
Description
300khz Synchronous Pwm Controller
Manufacturer
Microsemi Corporation
Datasheet
1.NX2154.pdf
(17 pages)
- Current page: 5 of 17
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BLOCK DIAGRAM
Rev.1.2
02/26/07
COMP
VCC
GND
FB
START
COMP
0.3V
Generator
Digital
start Up
Bias
0.8V
Figure 2 - Simplified block diagram of the NX2154/NX2154A
START
ramp
1.25V
0.8V
OSC
0.6V
CLAMP
UVLO
1.3V
CLAMP
70%Vp
S
R
FB
Q
POR
OC
START
Hiccup Logic
PWM
Hiccup Logic
OC
Control
Logic
OCP
comparator
NX2154/2154A
360mV/540mV
VCC
LDRV
HDRV
SW
BST
5
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