JW1881B
Non-isolated Buck
LED Two-Three Stage Switch Dimming Regulator
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DESCRIPTION
JW®1881B 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.
JW1881B 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
JW1881B 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.
JW1881B is integrated with high precision current
sampling circuit, which realizes high precision
LED constant output current and excellent line
Company’s Logo is Protected, “JW” and “JOULWATT” are Registered
Trademarks of JoulWatt technology Inc.
/load regulation. JW1881B has multiple protection
functions, including LED open / short circuit
protection, CS sense resistance short circuit
protection, under-voltage
protection, over
temperature protection, etc.
FEATURES
Two or three stage switch dimming
500V high voltage MOSFET integrated
No auxiliary winding
±3% output current
Very low operation current
Wide input voltage application
Output short or open protection
Sense resistor short protection
VCC under voltage protection
Over temperature protection
SOP7, DIP7 packages
APPLICATIONS
LED Driver, Bulb
TYPICAL APPLICATION
JW1881B Rev.0.86
JoulWatt
®
Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
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