ld7578 Leadtrend Technology, ld7578 Datasheet - Page 2

• Manufacturer Part Number: ld7578
• Description: Green-mode Pwm Controller With Hv Start-up Circuit And Otp Protection
• Manufacturer: Leadtrend Technology

Pin Configuration
Ordering Information
Pin Descriptions
Leadtrend Technology Corporation
LD7578-DS-00 October 2008
Part number
PIN
LD7578 GN
LD7578 GS
The LD7578 is ROHS compliant/ Green Package.
1
2
3
4
5
6
7
8
(-) LATCH
NAME
COMP
GND
OUT
VCC
CS
NC
HV
Pulling this pin below 0.95V will shutdown the controller and enter latch mode unless
AC power-on recycles. By connecting a NTC from this pin to ground, it will achieve
the OTP protection function. Keep this pin float to disable the latch protection
function.
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 positive terminal of bulk capacitor to provide the startup current
for the controller. When VCC voltage trips UVLO(on), this HV loop will be turned off
to save the power loss of the startup circuit.
SOP-8
DIP-8
www.leadtrend.com.tw
SOP-8 & DIP-8 (TOP VIEW)
Package
8
1
TOP MARK
YYWWPP
7
2
6
3
Green package
Green package
5
4
2
YY:
WW:
PP:
FUNCTION
Year code
Week code
Production code
LD7578GS
LD7578GN
Top Mark
3600 /tube /Carton
2500 /tape & reel
LD7578
Shipping