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LD7752 Datasheet Preview

LD7752 Datasheet

Green-Mode PWM Controller

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LD7752
01/16/2013
Green-Mode PWM Controller with HV Start-Up Circuit and
Soft Start time Adjustment
REV. 00
General Description
The LD7752 brings high performance, highly integrated
functions, protections and EMI-improve solution. Its an
ideal solution for those cost-sensitive system, reducing
component count and overall system cost.
The LD7752 features high voltage startup circuit,
minimum loss and green-mode power-saving operation,
leading-edge blanking of the current sensing and internal
slope compensation. They also consist of more
protections of OLP (Over Load Protection) and OVP (Over
Voltage Protection) to prevent the circuit from damage
under abnormal conditions.
Furthermore, the proprietary frequency swapping function
can reduce the noise and help the power circuit designers
to enhance EMI performance with fewer components and
less developing time.
Features
High-Voltage Startup Circuit
UVLO (Under Voltage Lockout)
LEB (Leading-Edge Blanking) on CS Pin
Internal Frequency swapping
Internal Slope Compensation
Internal OCP Compensation
OVP (Over Voltage Protection) on Vcc Pin
OLP (Over Load Protection)
+250mA/-500mA Driving Capability
Soft-Driving
Soft Start Time and Grouping Frequency Adjustment
Applications
LCD Monitor/TV Power
Switching AC/DC Adaptor and Battery Charger
Open Frame Switching Power Supply
Typical Application
AC EMI
input Filter
HV VCC
CT OUT
LD7752
*
CS
GND COMP
photocoupler
Leadtrend Technology Corporation
LD7752-DS-00 January 2013
1
www.leadtrend.com.tw




Leadtrend

LD7752 Datasheet Preview

LD7752 Datasheet

Green-Mode PWM Controller

No Preview Available !

Pin Configuration
SOP-7 (TOP VIEW)
SOP-8 /DIP-8(TOP VIEW)
LD7752
7 65
TOP MARK
YYWWPP
1 YY2WW3PP4
8 765
TOP MARK
YYWWPP
1 YY2WW3PP4
YY:
WW:
PP:
Year code
Week code
Production code
Ordering Information
Part number Switching Freq.
Package
LD7752 GS
65kHz
SOP-8
LD7752 GR
65kHz
SOP-7
LD7752 GN
65kHz
DIP-8
The LD7752 is ROHS compliant/ Green Packaged.
Top Mark
LD7752 GS
LD7752 GR
LD7752 GN
Shipping
2500 /tape & reel
2500 /tape & reel
3600 /tube /Carton
Pin Descriptions
PIN NAME
1 CT
2 COMP
3 CS
4 GND
5 OUT
6 VCC
7 NC
8 HV
FUNCTION
Soft start time adjustment.
Voltage feedback pin (same as the COMP pin in UC384X). Connect a photo-coupler
to close the control loop and achieve regulation.
Current sense pin, connect it to sense the MOSFET current
Ground
Gate drive output to drive the external MOSFET
Supply voltage pin
Unconnected Pin
Connect this pin with positive terminal of bulk capacitor to provide startup current for
the controller. As Vcc voltage trips to UVLO (on), this HV loop will be disabled to
minimize power loss through the startup circuit.
Leadtrend Technology Corporation
LD7752-DS-00 January 2013
2
www.leadtrend.com.tw


Part Number LD7752
Description Green-Mode PWM Controller
Maker Leadtrend
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LD7752 Datasheet PDF






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