AN4496 datasheet(7/18 Pages) STMICROELECTRONICS

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AN4496 Scheda tecnica(PDF) 7 Page - STMicroelectronics

Il numero della parte	AN4496

Spiegazioni elettronici	How to get a high power factor with the HVLED815PF device

PDF	18 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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7 / 18 page

DocID026370 Rev 1

7/18

AN4496

ILED pin

Figure 6. Pin ILED modulation circuitry for wide input voltage range application

In the low range (88 V - 132 V) the transistor Qr is open and the circuit in Figure 6 becomes

as that in Figure 7. The value of KACL is obtained from Equation 9.

Equation 11

The sum Rp1 + Rp2 + Rps can be calculated by Equation 10 that becomes:

Equation 12

Rp1 + Rp2 + Rps = Rp3 * (KACL - 1)

Where Rp3 = RAC and Rph = Rp1 + Rp2.

Rph resistor is splitted into Rp1 and Rp2 to satisfy the maximum voltage ranting of the case,

then Rp1 = Rp2, and choosing Rps = Rp1 / 3 permits to use a high value of Rpe.

Equation 13

Rp1 = Rp2 = 3 / 7 * Rp3 * (KACL - 1);

Rps = 1 / 7 * Rp3 * (KACL - 1)

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