is a non-isolated Buck regulator with high precision output current and switch
dimming function. The two or three stage dimming can be achieved by setting the
external pin connection. The chip operates in BCM or DCM and is suitable for universal
input with 85VAC~265VAC.
can work in two or three stage switch dimming, which two stage dimming is 100%,
15% output current and three stage dimming is 100%, 40%, 15% output current respectively.
When the switch is switched off for more than 5 second, the chip will switch on
to the first switch state
can realize the constant current characteristic with lot of advantages such as integrated
500V MOSFET, very low operation current, without auxiliary winding detection
and power supply, only a few external components, which greatly decreases the
cost and volume of the system.
is integrated with high precision current sampling circuit, which realizes high
precision LED constant output current and excellent line /load regulation. JW1881A
has multiple protection functions, including LED open / short circuit
protection, CS sense resistance short circuit protection, under-voltage
protection, over temperature protection, etc.