UL22

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

12 of 13

www.unisonic.com.tw

QW-R125-088.a



REFERENCE DESIGN (Cont.)

3.

20W, 1-channel, 2-dimming level 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

170V/120mA/12

mA

20W/2W

H-Side Buck

with DCM fixed

Schematic

Figure 6: Schematic

Typical Performance

Table 3: Measured Results

TYPE

SYMBOL

UNIT

175Vac

200Vac

220Vac

240Vac

264Vac

Pin

W

21.119

21.184

21.253

21.185

21.332

V

168.8

168.5

168.1

167.6

167.4

mA

119.7

119.8

119.9

120.0

120.1

%

95.67

95.29

94.83

94.94

94.25

Level 1

%

-0.17

-0.08

0.00

0.08

0.17

Pin

mW

2.037

2.137

2.178

2.217

2.286

V

144.6

144.8

145.0

145.1

145.3

mA

12.3

12.38

12.45

12.52

12.6

%

87.31

83.89

82.89

81.94

80.09

Level 2

%

-1.20

-0.56

0.00

0.56

1.20