ld7577gs Leadtrend Technology, ld7577gs Datasheet - Page 2

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

Pin Configuration
Ordering Information
Pin Descriptions
Leadtrend Technology Corporation
LD7577-DS-01 January 2009
The LD7577 is ROHS compliant.
PIN
Part number
LD7577 GN
LD7577 GS
1
2
3
4
5
6
7
8
COMP
NAME
GND
BNO
OUT
VCC
CS
NC
HV
Brownout Protection Pin. Connect a resistor divider between this pin and bulk
capacitor voltage to set the brownout level. If the voltage is less than threshold
voltage, the PWM output will be disabled. As soon as the voltage is over 4.0V, the
OVP will be tripped and the gate drive will be turned off.
Voltage feedback pin. By connecting a photo-coupler to close the control loop, it can
achieve the regulation.
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 UVLO(on), this HV loop will be turned off
to save the power loss of the startup circuit.
Current sense pin. Connect it to sense the MOSFET current.
Ground.
Supply voltage pin.
SOP-8
DIP-8
www.leadtrend.com.tw
SOP-8 & DIP-8 (TOP VIEW)
Package
8
1
TOP MARK
YYWWPP
7
2
Green package
Green package
6
3
5
4
2
YY:
WW:
PP:
FUNCTION
Year code
Week code
Production code
LD7577GS
LD7577GN
Top Mark
3600 /tube /Carton
2500 /tape & reel
Shipping
LD7577