ld7578j Leadtrend Technology, ld7578j Datasheet - Page 2

• Manufacturer Part Number: ld7578j
• Description: High Voltage Green-mode Pwm Controller With Over Temperature Protection
• Manufacturer: Leadtrend Technology

Ordering Information
Pin Descriptions
Leadtrend Technology Corporation
LD7578J-DS-00 March 2009
LD7578J GS
LD7578J GN
The LD7578J is green packaged.
Part number
Pin Configuration
PIN
1
2
3
4
5
6
7
8
(-) LATCH
COMP
Switching
NAME
GND
OUT
VCC
CS
NC
HV
65KHz
65KHz
Freq.
Pull this pin lower than 0.95V to shutdown the controller into latch mode until the AC
power-on recycles. By connecting a NTC with this pin to ground, it can achieve the
OTP protection function. Keep this pin float to disable the latch protection.
Voltage feedback pin. By connecting a photo-coupler to close the control loop, it can
achieve the regulation.
Current sense pin, for sensing the MOSFET current.
Ground.
Gate drive output to drive the external MOSFET.
Supply voltage pin.
Unconnected Pin.
Connect this pin to a positive terminal of bulk capacitor to provide the startup current
for the controller. When Vcc voltage trips the UVLO(on), this HV loop will be turned
off to save the power loss on the startup circuit.
Auto recovery
Auto recovery
Protection
Mode
www.leadtrend.com.tw
SOP-8 & DIP-8 (TOP VIEW)
8
1
TOP MARK
YYWWPP
7
2
6
3
SOP-8
DIP-8
5
4
2
Package
YY:
WW:
PP:
Green package
Green package
FUNCTION
Year code
Week code
Production code
LD7578J GS
LD7578J GN
Top Mark
LD7578J
2500 /tape & reel
3600 /tube /Carton
Shipping