AN2711 datasheet(23/36 Pages) STMICROELECTRONICS

Il numero della parte	AN2711

Spiegazioni elettronici	The cost of power LEDs is rapidly decreasing

PDF	36 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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AN2711

Performance

Doc ID 14425 Rev 3

23/36

This configuration uses the transformer at maximum current in the full series connection. A

Ω resistor has been placed at R36 to increase the regulated current to slightly over the

1/2 A limit. The efficiency hit at low input voltage is mostly due to I2R loss in the input filter.

6.1.4

Setup for maximum output current

16 W out, 5 series LEDs, jumpers at W1-W2, W3-W4, W6-W8.

Figure 17.

96 V line 16 W, 10 series LEDs

Figure 18.

132 V line 16 W, 10 series LEDs

Table 5.

Performance at 16 W into 10 series LEDs

Parameter

Very low line

Low line

Nominal line

High line

Line voltage

108

120

132

Line current, mA

227

195.2

171.0

154.4

Input power, Watts

21.42

20.67

20.08

19.77

Power factor

0.9855

0.9813

0.9756

0.9686

Output voltage

30.84

30.79

30.77

30.75

Output current, mA

0.528

Current ripple, mA P-P

152

144

148

144

Output power

16.28

16.26

16.25

16.24

Efficiency, %

76.0

78.6

80.9

82.1

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