AN3256 datasheet(10/23 Pages) STMICROELECTRONICS

10 / 23 page

Performance with LED loads

AN3256

10/23

Doc ID 17790 Rev 1

3.5

Strings of 12 series-connected 1 W white LEDs

Dropout to flashing, 70 V.

●

Trace colors:

–

Yellow = line voltage, 50 V/div ref 0

–

Magenta = line current, 200 mA/div ref 0

–

Blue = LED voltage, 10 V/div ref - 3 div

–

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

Figure 10.

96 V input, 10 LED load

Figure 11.

132 V input, 10 LED load

Table 5.

Performance overline voltage range with 12 LEDs per string

Parameter

20 % low line

10 % low line

Nominal line

10 % high line

Line voltage

95.7

107.8

120.2

132.5

Line current, mA

170.3

157.1

144.8

134.6

Input power, Watts

15.09

15.32

15.44

15.46

Power factor

0.923

0.905

0.886

0.868

Output voltage

37.17

37.14

37.13

37.10

Output current, Amps

0.369

0.374

0.375

0.373

Output power, Watts

13.716

13.89

13.92

13.84

Efficiency

90.9 %

90.7 %

90.2 %

89.5 %

Power loss, Watts

1.374

1.430

1.520

1.620

U1 Vcc

15.74

16.48

16.86

17.14

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