AN3256 datasheet(8/23 Pages) STMICROELECTRONICS

Part #	AN3256

Description	Low-cost LED driver for an A19 lamp

PDF	23 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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8 / 23 page

Performance with LED loads

AN3256

8/23

Doc ID 17790 Rev 1

3.3

Strings of 8 series-connected 1 W white LEDs

Dropout to flashing, 73 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 6.

96 V input, 6 LED load

Figure 7.

132 V input, 6 LED load

Table 3.

Performance overline voltage range with 8 LEDs per string

Parameter

20 % low line

10 % low line

Nominal line

10 % high line

Line voltage

95.7

107.6

120.0

132.2

Line current, mA

123.2

113.2

104.9

97.9

Input power, Watts

10.80

10.93

11.00

10.98

Power factor

0.919

0.896

0.871

0.848

Output voltage

25.00

24.99

24.97

24.93

Output current, Amps

0.384

0.388

0.385

Output power, Watts

9.60

9.70

9.69

9.60

Efficiency

88.9 %

88.7 %

88.1 %

87.4 %

Power loss, Watts

1.20

1.23

1.31

1.38

U1 Vcc

14.62

16.2

16.58

16.90

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