ld7577j Leadtrend Technology, ld7577j Datasheet - Page 2

• Manufacturer Part Number: ld7577j
• Description: High Voltage Green-mode Pwm Controller With Brown-out Protection
• Manufacturer: Leadtrend Technology

Pin Configuration
Ordering Information
Pin Descriptions
Leadtrend Technology Corporation
LD7577J-DS-00b July 2009
Part number
LD7577J GR
LD7577J GS
LD7577J GN
PIN
Note: The LD7577J is ROHS compliant.
1
2
3
4
5
6
7
8
SOP-7 (TOP VIEW)
7
1
LD7577JGR
YYWWPP
COMP
NAME
BNO
GND
OUT
VCC
CS
NC
HV
2
6
3
Switching
65KHz
65KHz
65KHz
Freq.
5
4
Brownout Protection Pin. Connect a resistor divider between this pin and bulk
capacitor voltage to set the brownout level. If the voltage is below threshold voltage,
the PWM output will be disabled. The BNO pin also provides AC over voltage
protection. As soon as the voltage is over 4.16V, it will trip OVP and turn off the gate.
Voltage feedback pin. Through the connection of a photo-coupler, it can close the
control loop and achieve the regulation.
Current sense pin. Connect it to sense 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 (TOP VIEW)
8
1
www.leadtrend.com.tw
LD7577JGS
YYWWPP
SOP-7
SOP-8
DIP-8
7
2
6
3
Package
5
4
Green package
Green package
Green package
2
DIP-8 (TOP VIEW)
8
1
LD7577JGN
YYWWPP
FUNCTION
7
2
6
3
4
5
LD7577JGR
LD7577JGN
LD7577JGS
Top Mark
YY:
WW:
PP:
Year code
Week code
Production code
LD7577J
3600 /tube /Carton
2500 /tape & reel
2500 /tape & reel
Shipping