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LD7576A Datasheet Preview

LD7576A Datasheet

Green-Mode PWM Controller

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LD7576A
1 1/29/2009
Green-Mode PWM Controller with High-Voltage
Start-Up Circuit and Adjustable OLP Delay Time
REV. 00b
General Description
The LD7576A brings hi gh performance, and com bines
highly inte grated functions, protections an d EMI-improve
solution. It’s an id eal so lution for those cost-sensitive
systems, redu cing comp onent count and overa ll s ystem
cost.
The LD7576A features near-lossless high v oltage startup
circuit, green-mode power-saving operation, leading-edge
blanking of the curre nt sensi ng an d i nternal slop e
compensation. They are also equipped with protections,
such as OLP (Over Load Pro tection), OVP (Over Voltage
Protection) and OT P (Over T emperature Protection), to
prevent circuit damage under abnormal conditions.
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 Internal Slope Compensation
z OVP (Over Voltage Protection) on Vcc
z On-Chip OTP (Over Temperature Protection)
z OLP (Over Load Protection)
z 500mA Driving Capability
z Adjustable OLP delay time
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
Leadtrend Technology Corporation
LD7576A-DS-00b November , 2009
1
www.leadtrend.com.tw
http://www.Datasheet4U.com




Leadtrend

LD7576A Datasheet Preview

LD7576A Datasheet

Green-Mode PWM Controller

No Preview Available !

Pin Configuration
SOP-7 (TOP VIEW)
SOP-8, D IP-8 (TOP VIEW)
LD7576A
8 65
TOP MARK
YYWWPP
1 23 4
8 76 5
LTDO7P57M6AARGKS
YYWWPP
1 23 4
YY:
WW:
PP:
Year code
Week code
Production code
Ordering Information
Part number
LD7576A GR
Package
SOP-7
Top Mark
LD7576AGR
LD7576A GS
SOP-8
LD7576AGS
LD7576A GN
DIP-8
LD7576AGN
The LD7576A is ROHS compliant/ Green Package.
Shipping
2500 /tape & reel
2500 /tape & reel
3600 /tube /Carton
Pin Descriptions
PIN NAME FUNCTION
1 CT
This pin is to program the frequ ency of a lo wer freq uency timer. Connecting a
capacitor to ground sets the OLP delay time.
Voltage fee dback pi n (sam e as th e CO MP pin in UC384X). Co nnecting a
photo-coupler closes the co ntrol loo p to achieve the regu lation. A high qu ality
2 COMP
ceramic capacitor (X7R), with capacitance of 102pF at least, is required for gen eral
applications.
3 CS Current sense pin, for sensing the MOSFET current.
4 GND
Ground.
5 OUT Gate drive output to drive an external MOSFET.
6 VCC Supply voltage pin.
7 NC
Unconnected Pin.
Connect this p in to a p ositive termina l of a bulk c apacitor to provi de t he startup
8 HV current for the control ler. When Vcc voltage trips up to the UVLO(on), this HV loop
will be off to save the power loss on the startup circuit.
Leadtrend Technology Corporation
LD7576A-DS-00b November , 2009
2
www.leadtrend.com.tw


Part Number LD7576A
Description Green-Mode PWM Controller
Maker Leadtrend
PDF Download

LD7576A Datasheet PDF






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