ld7578h Leadtrend Technology, ld7578h Datasheet - Page 3

• Manufacturer Part Number: ld7578h
• Description: High Voltage Green-mode Pwm Controller With Over Temperature Protection
• Manufacturer: Leadtrend Technology

Block Diagram
Leadtrend Technology Corporation
LD7578H-DS-00 February 2010
(-)LATCH
COMP
CS
32V
Vbias
Internal
Control
OSC
Green
Mode
5.0V
16.0V/
10.0V
Blanking
Leading
Edge
OLP
Comparator
V
UVLO
Comparator
BIAS
PG
www.leadtrend.com.tw
2R
100uA
R
Delay Time
1. 05V/0. 95V
OLP
VCC OK
Vref OK
+
+
internal bias
0. 85V
GND
Slope
Compensation
& Vref
HV
3
Comparator
PWM
0 Enable
1 Disable
1 mA
PG
PDR
OLP
OVP
OTP
OCP
Comparator
All
Blocks
Q
VCC
S
R
Counter
1/ 2
R
S
OVP
Q
S
R
OVP
Comparator
PG
R
S
8.0V
Q
OTP
Driver
Stage
PDR
Q
28.0V
LD7578H
OLP
PDR
OUT