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LD7575A Datasheet Preview

LD7575A Datasheet

Green-Mode PWM Controller

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LD7575A
11/29/2007
Green-Mode PWM Controller with High-Voltage
Rev.00a
Start-Up Circuit
General Description
The LD7 575A is a c urrent-mode PWM con troller with
excellent pow er-saving o peration. It fea tures a high-
voltage current source to directly supply the startup current
from bulk capacitor and further to provide a lossless startup
circuit. The integrated functions such as the le ading-edge
blanking of the current sensing, internal slope compensation,
and the small package provide the users a high effic iency,
minimum external component counts, and low cost solution
for AC/DC power applications.
Furthermore, the e mbedded over volt age protection, o ver
load protection and the special green-mode control provide
the solution fo r users to design a hig h performance po wer
circuit easily. The LD7575A is offered in both SOP-8 and
DIP-8 package.
Features
z High-Voltage (500V) Startup Circuit
z Current Mode Control
z Non-Audible-Noise Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Programmable Switching Frequency
z Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc
z OLP (Over Load Protection)
z 500mA Driving Capability
Applications
z Switching AC/DC Adapter and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
Leadtrend Technology Corporation
LD7575A-DS-00a November 2007
1
www.leadtrend.com.tw
http://www.Datasheet4U.com




Leadtrend

LD7575A Datasheet Preview

LD7575A Datasheet

Green-Mode PWM Controller

No Preview Available !

Pin Configuration
LD7575A
SOP-8 & DIP-8 (TOP VIEW)
8 765
TOP MARK
YYWWPP
1 234
YY:
WW:
PP:
Year code
Week code
Production code
Ordering Information
Part number
LD7575A PS
Package
SOP-8 PB Free
Top Mark
LD7575APS
LD7575A GS
SOP-8 Green Package LD7575AGS
LD7575A PN
DIP-8 PB Free
LD7575APN
The LD7575A is ROHS Complaint/ Green Package.
Pin Descriptions
Shipping
2500 /tape & reel
2500 /tape & reel
3600 /tube /Carton
PIN NAME F
UNCTION
1 RT
This pin is to program the switching frequency. By connecting a resistor to ground
to set the switching frequency.
Voltage fee dback pin (same as th e COMP pin in UC3 84X), connecting a
2 COMP
photo-coupler to close the control loop and achieve the regulation.
3 CS Current sense pin, connect to sense the MOSFET current
4 GND Ground
5 OUT Gate drive output to drive the external MOSFET
6 VCC
Supply voltage pin
7 NC
Unconnected Pin
Connect this pin to positive terminal of bulk capacitor to provide the startup current
8 HV
for the controller. When Vcc voltage trips t he UVLO(on), this HV loop will be off to
save the power loss on the startup circuit.
Leadtrend Technology Corporation
LD7575A-DS-00a November 2007
2
www.leadtrend.com.tw


Part Number LD7575A
Description Green-Mode PWM Controller
Maker Leadtrend
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LD7575A Datasheet PDF






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