Rev. 1.00

16

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Rev. 1.00

17

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HT7L4091

Universal Step-Down PWM Control

For High Brightness LED Lighting Control

Efficiency for Resistor Only Power and Single Input Voltage

The results of these curves are that each voltage corresponds to each input limit resistor. Theseresults

show how good the application is designed for a narrow voltage range using a resistor to power the

device.

The “LED string” means how many LEDs are in one string. 16S means there are 16 LEDs in one

string.

The output (LED) power is kept at 10W.

Input Voltage vs. Efficiency

65

70

75

80

85

90

95

80

130

180

230

280

Vac(V)

16S LED

14S LED

12S LED

10S LED

8S LED

LED String vs. Efficiency

65

70

75

80

85

90

95

6

8

10

12

14

16

18

LED String

260Vac

85Vac

110Vac

170Vac

220Vac

Input voltage vs. LED Current

150

200

250

300

350

400

450

80

130

180

230

280

Vac(V)

16S LED

14S LED

12S LED

10S LED

8S LED