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
Structure Type |
Part No. |
MOS |
Package |
App. Watt |
OVP |
PDF | ||
176-264Vac |
90-264Vac | |||||||
Non-isolation |
PF﹥0.5 |
WS9442P |
2A/500V |
DIP7 |
120V/280mA |
80V/300mA |
External Set |
|
160V/220mA |
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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