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LD7578 Datasheet Preview

LD7578 Datasheet

Green-Mode PWM Controller

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LD7578 pdf
LD7578
10/08/2008
Green-Mode PWM Controller with HV Start-Up Circuit
and OTP Protection
Rev.00
General Description
Features
The LD7578 integrates several functions of protections in
a SOP-8 package. It minimizes the component counts and
the circuit space.
The device provides functions of low startup current,
green-mode power-saving operation, leading-edge
blanking of the current sensing and internal slope
compensation. Also, the LD7578 features more
protections like OLP (Over Load Protection), OVP (Over
Voltage Protection), and external OTP (Over Temperature
Protection) to prevent the circuit from being damaged
under abnormal conditions.
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 OLP (Over Load Protection)
z OTP through a NTC/Latch-Off Mode
z 500mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
z LCD Monitor/TV Power
Typical Application
AC
input
EMI
Filter
*
HV VCC OUT
LD7578
(-)LATCH
CS
GND COMP
*
*See Application Information
photocoupler
TL431
Leadtrend Technology Corporation
LD7578-DS-00 October 2008
1
www.leadtrend.com.tw



Leadtrend
Leadtrend

LD7578 Datasheet Preview

LD7578 Datasheet

Green-Mode PWM Controller

No Preview Available !

LD7578 pdf
Pin Configuration
SOP-8 & DIP-8 (TOP VIEW)
8 76 5
TOP MARK
YYWWPP
1234
YY:
WW:
PP:
Year code
Week code
Production code
LD7578
Ordering Information
Part number
Package
LD7578 GS
SOP-8
Green package
LD7578 GN
DIP-8
Green package
The LD7578 is ROHS compliant/ Green Package.
Top Mark
LD7578GS
LD7578GN
Shipping
2500 /tape & reel
3600 /tube /Carton
Pin Descriptions
PIN NAME
FUNCTION
Pulling this pin below 0.95V will shutdown the controller and enter latch mode unless
AC power-on recycles. By connecting a NTC from this pin to ground, it will achieve
1 (-) LATCH the OTP protection function. Keep this pin float to disable the latch protection
function.
Voltage feedback pin. By connecting a photo-coupler to close the control loop, it can
2 COMP
achieve the regulation.
3 CS Current sense pin, for sensing 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 UVLO(on), this HV loop will be turned off
to save the power loss of the startup circuit.
Leadtrend Technology Corporation
LD7578-DS-00 October 2008
2
www.leadtrend.com.tw


Part Number LD7578
Description Green-Mode PWM Controller
Maker Leadtrend
Total Page 19 Pages
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