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LD7578J Datasheet Preview

LD7578J Datasheet

High Voltage Green-Mode PWM Controller

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LD7578J pdf
LD7578J
03/03/2009
High Voltage Green-Mode PWM Controller with
Over Temperature Protection
Rev. 00
General Description
The LD7578J integrates several functions of protections,
and EMI-improved solution in a SOP-8/or DIP-8 package to
minimize 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 LD7578J features more protections like OLP (Over
Load Protection), OVP (Over Voltage Protection), and OTP
(Over Temperature Protection) to prevent the circuit being
damaged under the abnormal conditions. The LD7578J
features built-in auto-recovery function for OVP on Vcc pin
and OLP.
Furthermore, the LD7578J features frequency trembling to
depress radiation noise and is an excellent solution for EMI
filter design.
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 Frequency Trembling
z Internal Slope Compensation
z Internal Over Current Protection
z OVP (Over Voltage Protection) on Vcc
z OLP (Over Load Protection)
z External OTP through a NTC
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
Leadtrend Technology Corporation
LD7578J-DS-00 March 2009
1
www.leadtrend.com.tw



Leadtrend
Leadtrend

LD7578J Datasheet Preview

LD7578J Datasheet

High Voltage Green-Mode PWM Controller

No Preview Available !

LD7578J pdf
Pin Configuration
SOP-8 & DIP-8 (TOP VIEW)
8765
TOP MARK
YYWWPP
1 234
YY:
WW:
PP:
Year code
Week code
Production code
LD7578J
Ordering Information
Part number
LD7578J GS
Switching
Freq.
65KHz
Protection
Mode
Auto recovery
LD7578J GN
65KHz Auto recovery
The LD7578J is green packaged.
Package
SOP-8
DIP-8
Green package
Green package
Top Mark
LD7578J GS
LD7578J GN
Shipping
2500 /tape & reel
3600 /tube /Carton
Pin Descriptions
PIN NAME
1 (-) LATCH
2 COMP
3 CS
4 GND
5 OUT
6 VCC
7 NC
8 HV
FUNCTION
Pull this pin lower than 0.95V to shutdown the controller into latch mode until the AC
power-on recycles. By connecting a NTC with this pin to ground, it can achieve the
OTP protection function. Keep this pin float to disable the latch protection.
Voltage feedback pin. By connecting a photo-coupler to close the control loop, it can
achieve the regulation.
Current sense pin, for sensing the MOSFET current.
Ground.
Gate drive output to drive the external MOSFET.
Supply voltage pin.
Unconnected Pin.
Connect this pin to a positive terminal of bulk capacitor to provide the startup current
for the controller. When Vcc voltage trips the UVLO(on), this HV loop will be turned
off to save the power loss on the startup circuit.
Leadtrend Technology Corporation
LD7578J-DS-00 March 2009
2
www.leadtrend.com.tw


Part Number LD7578J
Description High Voltage Green-Mode PWM Controller
Maker Leadtrend
Total Page 19 Pages
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