UL23EA

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 13

www.unisonic.com.tw

QW-R125-072.c



TYPICAL APPLICATION CIRCUIT

The UL23EA is a linear constant current IC that supports the adjust brightness or color temperature in 3 grades.

The output current can be adjusted from 5mA to 120mA, and constant current accuracy up to ± 4%.

Plan1/Plan2 adjust brightness mode application of UL23EA, User can change the size of the output current by turn

on/off the power switch, that adjust brightness of LED lights. Changing the REXT external resistance Adjustment of

brightness ratio from X% - 50% - 100%.

Open the switch for the 1st time, during constant current：

REXT1

REXT2

0.6

I1=

R+R

Open the switch for the 2nd time, during constant current：

REXT2

0.3

I2=

R

Open the switch for the 3rd time, during constant current：

REXT2

0.6

I3=

R

The dimming ratio is X%, 50%, 100%，

REXT2

REXT1

REXT2

R

X%=

R+R

Plan 3/Plan 4 adjust brightness mode application of UL23EA, User can change the size of the output current by

turn on/off the power switch, that adjust brightness of LED lights. Changing the REXT external resistance Adjustment

of brightness ratio from 100% - 50% - X%.

Open the switch for the 1st time, during constant current：

REXT

0.6

I1=

R2

Open the switch for the 2nd time, during constant current：

REXT2

0.3

I2=

R

Open the switch for the 3rd time, during constant current：

REXT1

REXT2

0.6

I3=

R+R

The dimming ratio is X%, 50%, 100%，

REXT2

REXT1

REXT2

R

X%=

R+R

Plan 5/Plan 6 adjust color temperature application of UL23EA, User can change the state of the two output ports

by turn on/off the power switch, that adjust the color temperature through the light of two different colored LED lights.

Changing the REXT external resistance can adjustment the output power.

Open the switch for the 1st time, during constant current：

REXT2

0.6

I1=

R

Open the switch for the 2nd time, during constant current：

REXT1

REXT2

0.3

0.3

I2=

RR



Open the switch for the 3rd time, during constant current：

REXT1

0.6

I3=

R