AN4213 datasheet(15/42 Pages) STMICROELECTRONICS

Part #	AN4213

Description	Fluorescent lamps are increasingly driven by electronic

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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DocID023984 Rev 2

15/42

AN4213

Designing a TM PFC

The breakdown voltage is fixed by the same criterion as the Power MOSFET. A minimum

breakdown voltage of 1.2*(V

OUT

ΔV

OVP

) and a current rating higher than 3*I

OUT

, can be

chosen for a rough initial selection of the rectifier.

In this 116 W application an STTH1L06 (600 V, 1 A) has been selected.

From the STTH1L06 datasheet, V

is 0.89V and R

is 0.165

Ω, therefore substituting these

values in

Equation 25, we have:

3.4

L6562A biasing circuitry (pin by pin)

This section explains the dimensioning of the biasing circuitry pin-by-pin.

For reference, the relevant components have been highlighted in the figure below.

Figure 5. PFC electrical schematic

()

DON

315

165

AM17319v1

INV

COMP

MULT

ZCD

GND

VCC

400Vdc

Rmulth

Rmultl

Rzcd

Rsense

NTC

Routh

Routl

Ccomp

ultl

Vin(Vac)

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