ld7576jps Leadtrend Technology, ld7576jps Datasheet - Page 3

• Manufacturer Part Number: ld7576jps
• Description: Green-mode Pwm Controller With High-voltage Start-up Circuit And Adjustable Olp Delay Time
• Manufacturer: Leadtrend Technology

Pin Descriptions
Leadtrend Technology Corporation
LD7576-DS-03 December 2007
PIN
1
2
3
4
5
6
7
8
COMP
NAME
GND
OUT
VCC
CT
CS
NC
HV
This pin is to program the frequency of the low frequency timer. By connecting a
capacitor to ground to set the OLP delay time.
And this pin can be used for latch mode protection. By pulling this pin lower than 0.8
V, the controller will be entered latch mode until the AC power-on recycling.
Voltage feedback pin (same as the COMP pin in UC384X), By connecting a
photo-coupler to close the control loop and achieve the regulation. A high quality
ceramic capacitor (X7R) is required for general applications (102pF at least).
Ground
Gate drive output to drive the external MOSFET
Unconnected Pin
Connect this pin to 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 off to
save the power loss on the startup circuit.
Current sense pin, connect to sense the MOSFET current
Supply voltage pin
www.leadtrend.com.tw
3
FUNCTION
LD7576/76H/76J/76K