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LD7751 Datasheet Preview

LD7751 Datasheet

High Voltage Green-Mode PWM Controller

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LD7751
12/28/2010
High Voltage Green-Mode PWM Controller
Rev. 00
General Description
The LD7751 integrates several functions of protections,
and EMI-improved solution in a SOP-7, 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 LD7751 features more
protections like OLP (Over Load Protection), and OVP
(Over Voltage Protection) to prevent the circuit being
damaged under the abnormal conditions. The LD7751
features built-in auto-recovery function for OVP on Vcc pin
and OLP.
Features
z High-Voltage (500V) Startup Circuit
z Current Mode Control
z Green Mode Control
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Internal Frequency Swapping
z Internal Slope Compensation
z Internal Over Current Protection
z OVP (Over Voltage Protection) on Vcc
z OLP (Over Load Protection)
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
EMI
Filter
Leadtrend Technology Corporation
LD7751-DS-00 December 5, 2010
1
www.leadtrend.com.tw




Leadtrend

LD7751 Datasheet Preview

LD7751 Datasheet

High Voltage Green-Mode PWM Controller

No Preview Available !

Pin Configuration
SOP-7 (TOP VIEW)
SOP-8 /DIP-8 (TOP VIEW)
LD7751
8 65
TOP MARK
YYWWPP
1 234
8 76 5
TOP MARK
YYWWPP
1 2 34
YY:
WW:
PP:
Year code
Week code
Production code
Ordering Information
Part number Switching Freq.
Package
LD7751 GS
65kHz
SOP-8 Green package
LD7751 GR
65kHz
SOP-7 Green package
LD7751 GN
65kHz
The LD7751 is ROHS compliant.
DIP-8 Green package
Top Mark
Shipping
LD7751 GS 2500 /tape & reel
LD7751 GR 2500 /tape & reel
LD7751 GN 3600 /tube /Carton
Protection Mode
Part number
LD7751
Switching Freq.
65kHz
VCC OVP
Auto recovery
OLP
Auto recovery
Pin Descriptions
SOP-8 SOP-7
11
22
33
44
55
66
7
88
NAME
NC
COMP
CS
GND
OUT
VCC
NC
HV
FUNCTION
Unconnected Pin.
Voltage feedback pin. By connecting a photo-coupler to close the
control loop 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 reduce the power loss over the startup
circuit.
Leadtrend Technology Corporation
LD7751-DS-00 December 5, 2010
2
www.leadtrend.com.tw


Part Number LD7751
Description High Voltage Green-Mode PWM Controller
Maker Leadtrend
Total Page 18 Pages
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