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Leadtrend Technology Corporation
Leadtrend Technology Corporation

LD7591 Datasheet

Transition-Mode PFC Controller


LD7591 Datasheet Preview


LD7591
04/30/2009
Transition-Mode PFC Controller with Fault Condition Protection
Datasheet. P03 (for Internal Use Only)
General Description
The LD7591 is a voltage mode PFC controller operating on
transition mode, integrated several functions of protection,
such as OVP, OCP, and Brown-in protection. It minimizes
the components counts and is available in a SOP-8 or DIP-8
package. Those make it an ideal design for low cost
applications.
It provides functions of low startup current, over voltage
protection, open feedback protection, disable function, over
current protection, under voltage lockout and integrated LEB
of the current sensing. Also, the LD7591 features without
mains voltage sensing compared with traditional current
mode PFC for power saving. The LD7591 can be disabled if
the INV pin voltage is lower than 0.45V and the operating
current decreases to 65μA
.
Features
z Transition mode of PFC pre-regulator
z Voltage mode control
z Programmable max. on-time
z Low Startup Current (<30μA)
z UVLO (Under Voltage Lockout)
z LEB (Leading-Edge Blanking) on CS Pin
z Open-Feedback Protection and Disable Function
z OVP (Over Voltage Protection)
z OCP (Cycle by cycle current limiting)
z 800/-1200mA Driving Capability
z Internal OTP function
Applications
z Output above 65W adaptor.
z Open Frame Switching Power Supply
z LCD TV Power Supply
z LED Power Supply
Patent Pending
Typical Application for Boost PFC
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AC EMI
Inpu Filter
t
7
8
4
5
1
32
6
Leadtrend Technology Corporation
LD7591-DS-P03 Apr. 2009
1
Page 1

Typical Application for LED (Flyback PFC)
AC
Input
EMI
Filter
87
4
52
1
3
6
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LD7591
Leadtrend Technology Corporation
LD7591-DS-P03 Apr. 2009
2
Page 2

Pin Configuration (Top view)
LD7591
Ordering Information
Part number
LD7591 GS
LD7591 GN
Package
SOP-8
Green package
DIP-8
Green package
Top Mark
LD7591GS
LD7591GN
Shipping
3600/ Tube/ Carton
3000/ Tube/ Carton
Pin Descriptions
NAME
INV
Pin
(SOP-8/DIP-8)
1
COMP
2
RAMP
3
CS 4
ZCD
5
GND
6
OUT
7
VCC
8
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FUNCTION
Output voltage feed back control
Output of the error amplifier for voltage loop compensation to achieve stable
Ramp generator, connecting a resistor to GND pin to set the saw tooth signal
Current sense pin, connect to sense the MOSFET current for OCP
Detecting zero crossing of input signal
Ground
Gate drive output to drive the external MOSFET
Power source VCC pin
Recommended Operating Conditions
Item
Vcc pin capacitor
Comp pin capacitor
RAMP pin resistor
Min.
22
0.1
4.7k
Max.
47
0.47
100k
Unit
μF
μF
Ω
Leadtrend Technology Corporation
LD7591-DS-P03 Apr. 2009
3
Page 3

Block Diagram
LD7591
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Leadtrend Technology Corporation
LD7591-DS-P03 Apr. 2009
4
Page 4
Part Number LD7591
Manufactur Leadtrend Technology Corporation
Description Transition-Mode PFC Controller
Total Page 19 Pages
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