ld7577gs Leadtrend Technology, ld7577gs Datasheet - Page 3

• Manufacturer Part Number: ld7577gs
• Description: High Voltage Green-mode Pwm Controller With Brown-out Protection
• Manufacturer: Leadtrend Technology

Block Diagram
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
COMP
BNO
CS
Vbias
32V
65 KHz
OSC
Control
Green
Mode
5.0V
1. 05V/0. 95V
16.0V/
10.0V
Blanking
Leading
Edge
Brownout Comparator
OLP
Comparator
UVLO
Comparator
PG
4.0V/3.8V
www.leadtrend.com.tw
2R
Line OVP Comparator
R
30 mS
Delay
VCC OK
Vref OK
+
+
internal bias
Protection
0.85V
GND
& Vref
HV
Compensation
Slope
Line OVP
3
BNOUT
OLP
PWM
Comparator
1 mA
PG
OVP
Comparator
OCP
All
Blocks
Counter
VCC
1 / 2
OVP
S
R
Comparator
OVP
PG
S
R
S
R
8.0V
Q
Driver
Stage
PDR
Q
28.0V
Q
Protection
OLP
LD7577
PDR
OUT