WS9445P Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – Non-isolated BuckOffline LED Driver

WS9445P Product Description
Features
 Critical Conduction Mode Operation
 Internal 600V 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 BuckOffline LED Driver
Description
The WS9445P 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
WS9445P integrates a 600V 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 simplifying design and reducing cost.
The WS9445P adopts intelligent temperature control and
thoroughly solves the problem of light flashing at high
temperatures. It integrates an external dimming pin which
inputs PWM signal and can dim by changing the duty cycle of
the PWM signal. The WS9445P 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 WS9445P is available in DIP-7 Package.
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