WS9442P Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – Non-isolated Buck Offline LED Driver

WS9442P Product Description
Features
 Critical Conduction Mode Operation
 Internal 500V Power MOSFET
 Gate Drive and No Auxiliary Winding
 ±3% LED Current Accuracy
 Efficiency up to 93%
 LED Short Circuit Protection
 LED Open Circuit Protection
 Current Sense Resistor Short Protection
 Thermal Regulation Function
 External PWM Dimming
Applications
 LED Bulb Lights
 LED Panel Lights
 LED Strings
Typical Application Circuit
Non-isolated Buck Offline LED Driver
Description
The WS9442P is a high precision buck constant current LED
driver and is applied to non-isolated buck LED power system with
AC input voltage of 85VAC-265VAC. The WS9442P integrates a
500V power MOSFET, and can achieve excellent constant current
performance with very few external components, so the system
cost and size are minimized. The driver operates in critical
conduction mode, and the output current does not change with the
inductance and LED output voltage. The operating current of the
IC is 200uA, so it doesn’t need the auxiliary winding for supplying
the chip, thus simplify design and reduce cost.
The WS9442P adopts intelligent temperature control and
thoroughly solves the problem of LED flickering under high
temperature. It integrates an external dimming pin which inputs
PWM signal and can dim by changing the duty cycle of the PWM
signal. The WS9442P offers full protection functions to improve
the system reliability, including LED open circuit protection, LED
short circuit protection, CS resistor short circuit protection and
thermal regulation function.
The WS9442P is available in DIP-7 Package.
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