ld7522 Leadtrend Technology, ld7522 Datasheet - Page 2

• Manufacturer Part Number: ld7522
• Description: Smart Green-mode Pwm Controller With Multiple Protections
• Manufacturer: Leadtrend Technology

Pin Configuration
Ordering Information
Pin Descriptions
Leadtrend Technology Corporation
LD7522-DS-03 January 2008
PIN
1
2
3
4
5
6
7
8
The LD7522 is ROHS Complaint/ Green Package.
LD7522 PS
LD7522 GS
LD7522 PN
Part number
(-) LATCH
NAME
COMP
GND
BNO
OUT
VCC
OVP
CS
SOP-8 & DIP-8(TOP VIEW)
SOP-8
SOP-8
DIP-8
8
1
Brownout Protection Pin. Connected a resistor divider from this pin to bulk
capacitor voltage to set the brownout level and line compensation. When the
voltage of this pin is lower than threshold voltage, the PWM output will be off.
Voltage feedback pin (same as the COMP pin in UC384X), By connecting a
photo-coupler to close the control loop and achieve the regulation.
Pull this pin to lower than 2.5V will shutdown the controller to the latch mode until
the AC power-on recycling. By connecting a NTC from this pin to ground will
achieve the OTP protection function. Keep this pin as floating to disable the latch
protection.
Current sense pin, connect to sense the MOSFET current
Ground
Gate drive output to drive the external MOSFET
Supply voltage pin
This pin is high-active to provide the OVP function. By the connecting a zener
or a resistor voltage divider to Vcc will set the OVP level. Whenever the voltage
is higher than 2.5V, the OVP is tripped and the gate drive will be off. Short this
pin to ground to disable the OVP function.
TOP MARK
YYWWPP
www.leadtrend.com.tw
7
2
Package
6
3
PB Free
Green Package
DIP-8
5
4
YY
WW : Week code
##
2
: Year code (D: 2004, E: 2005…..)
: Production code
LD7522PS
LD7522GS
LD7522PN
TOP MARK
FUNCTION
2500 /tape & reel
2500 /tape & reel
3600/tube /carton
Shipping
LD7522