UL22

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

11 of 13

www.unisonic.com.tw

QW-R125-088.a



REFERENCE DESIGN (Cont.)

2.

5.8W, 2-channel COLOR control by ON/OFF AC Switch (Free-Dimming

Featured

Device

Application

Input Voltage

Output Voltage

(Rated Current)

Rated Output

Power

Topology

UTC UL22

LED Driver with

Free-Dimming

TM

42V/140mA

5.88W

Buck-Boost with

Schematic

8

7

6

5

4

3

2

1

CLK

DRV

SW2

SW1

CS

FB

COMP

UTC UL22

+

C5

10uF/

50V

DB1

MB6S

AC Input

L1 10mH

C1

47nF/

630V

C2

100nF

/630V

R3

130K

R10

39R

R1

130K

R2

130K

R4

750K

R6 39R

C6

220nF

R5

33K

C7

10nF

R13

39R

R14

39R

3

2

RCS1

3R0

1

Q2

PMV213SN215

1.9A/100V

Q3

PMV213SN215

1.9A/100V

R15

+

1A/600V

RL1

10K

Q1

STD3NK60

2.4A/600V

RCS2

3R0

T1

Buck-Boost

L12=680uH

N12:N13=142T:75T

Core: EE13

42V/140mA

D1

ES1J

2A/600V

C4

47nF

C3A

33uF/

250V

R9

750K

R12

5.1K

R16

3R9

3R3

Good Layout consideration with proper filter should be considered.

Figure 5: Schematic

Typical Performance

Table 2: Measured Results

Vin

180Vac

200Vac

220Vac

240Vac

264Vac

Pin, [W]

6.723

6.766

6.815

6.863

6.934

40.98

40.92

40.88

40.84

40.8

140.8

140.7

140.7

140.7

140.6

85.82

85.09

84.4

83.73

82.73

0.07

0.00

0.00

0.00

-0.07

THD, [%]

12

14.12

16.16

17.87

20.78

PF

0.956

0.943

0.929

0.927

0.91