AN3256 datasheet(9/23 Pages) STMICROELECTRONICS

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AN3256

Performance with LED loads

Doc ID 17790 Rev 1

9/23

3.4

Strings of 10 series-connected 1 W white LEDs

Dropout to flashing, 71.5 V.

●

Trace colors:

–

Yellow = line voltage, 50 V/div ref 0

–

Magenta = line current, 100 mA/div ref 0

–

Blue = LED voltage, 5 V/div ref - 3 div

–

Green = LED current, 100 mA/div ref -3 div

Figure 8.

96 V input, 8 LED load

Figure 9.

132 V input, 8 LED load

Table 4.

Performance overline voltage range with 10 LEDs per string

Parameter

20 % low line

10 % low line

Nominal line

10 % high line

Line voltage

95.2

108.3

120.1

132.6

Line current, mA

148

135.3

125.5

116.2

Input power, Watts

13.01

13.20

13.28

Power factor

0.923

0.901

0.882

0.861

Output voltage

31.11

31.09

31.07

31.03

Output current, Amps

0.377

0.381

0.382

0.379

Output power, Watts

11.73

11.85

11.87

11.76

Efficiency

90.1 %

89.7 %

89.4 %

88.6 %

Power loss, Watts

1.28

1.35

1.41

1.44

U1 Vcc

15.14

16.39

16.74

17.01

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