XC9401 Series

Off-line Controllers for LED Lighting

The XC9401 series are off-line controller ICs for LED lighting.

Through optimization of the external components, these ICs can be made to operate in a range from 85VAC to 270VAC, as well as by DC input, and a diversity of specifications can be achieved by selecting components appropriate for the circuit configuration. Fixed off-time control is used for the basic control method, and by detecting the current that flows to the external power MOSFET, the current that flows to the LED is monitored to provide a stable power supply for LED lighting. Three product series differing by function type are available.

The circuit configuration of type A is designed for the power factor, achieving a high power factor by synchronizing the LED current to the input current (sine wave).

Type B and C hold the peak current due to switching that flows to the external power MOSFET constant, enabling the LED current to be kept constant.

With the type C, dimming is possible by inputting a PWM signal into the EN/DIM pin to set the LED current within a range of 1% to 100%.

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Mar 25, 2014
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XC9401 Series
Apr 18, 2013
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Off-line Controllers for LED Lighting XC9401 Series

Typical Application Circuit


Operating Voltage 85VAC~270VAC
DC Input
Fixed Off-time 6.0μs(TYP.)
ISEN Voltage 5%(A,B Type)
2.5%(C Type)
Protection Ciruit Thermal Shut Down:150℃(TYP.)
VDD Over voltage protection:VDD=18V(TYP.)
Over current protection:VISEN=0.7V(TYP.)
Operating Ambient Temperature -40℃~+85℃
Environmentally Friendly EU RoHS compliant, Pb free



Technical Document

Quality Reports