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LD7537 Datasheet Preview

LD7537 Datasheet

Green-Mode PWM Controller

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LD7537
12/15/2011
Green-Mode PWM Controller with Frequency Swapping
and Integrated Protections
Rev. 01a
General Description
The LD7537 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 Brownout Protection
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
AC
input
EMI
Filter
BNO
VCC
OUT
COMP
LD7537
GND
CS
DC
Output
photocoupler
Leadtrend Technology Corporation
LD7537-DS-01a December 2011
1
www.leadtrend.com.tw
Free Datasheet http://www.nDatasheet.com




Leadtrend

LD7537 Datasheet Preview

LD7537 Datasheet

Green-Mode PWM Controller

No Preview Available !

Pin Configuration
DIP-8 (TOP VIEW)
8765
TOP MARK
YYWWPP
1 23 4
LD7537
SOT-26 (TOP VIEW)
OUT VCC CS
65
37
YWP pp
12
4
3
GND COMP BNO
Ordering Information
YY, Y : Year code (D: 2004, E: 2005…..)
WW, W : Week code
PP : Production code
P37 : LD7537
Part number
Package
LD7537GL
SOT-26
Green Package
LD7537GN
DIP-8
The LD7537GL is ROHS compliant.
Green Package
Top Mark
YWP/37
LD7537GN
Protection Mode
Switching Freq.
65kHz
VCC OVP
Latch
OLP
Auto recovery/ 65ms
Shipping
3000 /tape & reel
3600 /tube /Carton
BNO Pin
Auto recovery
Pin Descriptions
SOT-26
1
DIP-8
8
27
35
44
52
61
NAME
GND
COMP
BNO
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.
Brownout Protection Pin. Connect a resistor divider between this pin
and bulk capacitor voltage to set the brownout level. If the voltage is
less than threshold voltage, the PWM output will be disabled.
Current sense pin, connect it to sense the MOSFET current
Supply voltage pin
Gate drive output to drive the external MOSFET
Leadtrend Technology Corporation
LD7537-DS-01a December 2011
2
www.leadtrend.com.tw
Free Datasheet http://www.nDatasheet.com


Part Number LD7537
Description Green-Mode PWM Controller
Maker Leadtrend
Total Page 16 Pages
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