The WS9445D7P chip is used in LED lamps as a pulse driver for powering LEDs with current.The input voltage of the chip is from 85 to 265 Volts.It contains a field-effect transistor switch for supplying current to the choke and LEDs.The operating current of the chip is only 200 µA and it monitors the temperature and solves the problem of flashing LEDs.Also, the chip has protection against LED breakage,short circuit on the LEDs,short circuit of the CS resistor (current sense).EFFICIENCY up to 93%.The maximum current for LEDs is 560 mA at 120 Volts.
Such a chip is used in the Ecola Led Premium lamp with 80 watts of power.In the photo, her driver
Here is an approximate connection diagram of this chip, the nominal values of the parts are taken from the board, the nominal values of the resistors you can see on the board.
The lamp is quite massive and also contains a massive aluminum radiator
The lamp has burned out several LEDs and by closing them, you can fix the lamp for a while, but this will not help for long, since other LEDs may be running out.But the driver board is intact and working.
