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LD7536 Datasheet Preview

LD7536 Datasheet

Green-Mode PWM Controller

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LD7536
12/15/2011
Green-Mode PWM Controller with Frequency Swapping
and Integrated Protections
Rev. 02a
General Description
The LD7536 is built-in with several functions, protection
and EMI-improved solution in a tiny package. It takes less
components counts or circuit space, especially ideal for
those total solutions of low cost.
The implemented functions include low startup current,
green-mode power-saving operation, leading-edge
blanking of the current sensing and internal slope
compensation. It also features more protections like
OLP (Over Load Protection) and OVP (Over Voltage
Protection) to prevent circuit damage occurred under
abnormal conditions.
Furthermore, the Frequency Swapping function is to
reduce the noise level and thus helps the power circuit
designers to easily deal with the EMI filter design by
spending minimum amount of component cost and
developing time.
Features
z High-Voltage CMOS Process with Excellent ESD
protection
z Very Low Startup Current (<20μA)
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 OVP (Over Voltage Protection) on Vcc Pin
z OTP (Over Temperature Protection) through a NTC
z OLP (Over Load Protection)
z 300mA Driving Capability
Applications
z Switching AC/DC Adaptor and Battery Charger
z Open Frame Switching Power Supply
Typical Application
Leadtrend Technology Corporation
LD7536-DS-02a December 2011
1
www.leadtrend.com.tw




Leadtrend

LD7536 Datasheet Preview

LD7536 Datasheet

Green-Mode PWM Controller

No Preview Available !

Pin Configuration
DIP-8 (TOP VIEW)
8765
TOP MARK
YYWWPP
1 23 4
LD7536
SOT-26 (TOP VIEW)
OUT VCC CS
65
36
YWP pp
12
4
3
GND COMP OTP
Ordering Information
YY, Y : Year code (D: 2004, E: 2005…..)
WW, W : Week code
PP : Production code
P36 : LD7536
Part number
LD7536 GL
LD7536 GN
Package
SOT-26
Green Package
DIP-8
Green Package
Top Mark
YWP/36
LD7536 GN
Shipping
3000 /tape & reel
3600 /tube /Carton
Protection Mode
Switching Freq.
65kHz
VCC OVP
Latch
OLP
Auto recovery/ 65ms
OTP Pin
Latch
Pin Descriptions
PIN
SOT-26
1
PIN
DIP-8
8
27
35
44
52
61
NAME
GND
COMP
OTP
CS
VCC
OUT
FUNCTION
Ground
Voltage feedback pin (same as the COMP pin in UC384X). Connect a
photo-coupler to close the control loop and achieve the regulation.
Pull this pin below 0.95V to shutdown the controller into latch mode until the AC
resume power-on. Connecting this pin to ground with NTC will achieve OTP
protection. Keep this pin float to disable the latch protection.
Current sense pin, connect it to sense the MOSFET current
Supply voltage pin
Gate drive output to drive the external MOSFET
Leadtrend Technology Corporation
LD7536-DS-02a December 2011
2
www.leadtrend.com.tw


Part Number LD7536
Description Green-Mode PWM Controller
Maker Leadtrend
Total Page 16 Pages
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