ld7575b Leadtrend Technology, ld7575b Datasheet - Page 3

• Manufacturer Part Number: ld7575b
• Description: Green-mode Pwm Controller With High-voltage Start-up Circuit
• Manufacturer: Leadtrend Technology

Block Diagram
Leadtrend Technology Corporation
LD7575B-DS-00 May 2008
COMP
RT
CS
Vbias
32V
Green-Mode
Control
OSC
5.0V
16.0V/
10.0V
Blanking
Leading
Edge
PG
OLP
Comparator
UVLO
Comparator
2R
R
0.85V
30mS
Delay
VCC OK
∑
Vref OK
+
+
internal bias
PG
Slope
Compensation
& Vref
GND
HV
PWM
Comparator
OCP
Comparator
1mA
Counter
3
/2
S
R
S
R
S
R
POR
27.5V
clear
Q
Q
Q
8V
PG
OVP
OLP
OVP
Comparator
Driver
Stage
POR
LD7575B
VCC
OUT