AN4213 Datasheet, PDF (15/42 Pages) STMicroelectronics – Fluorescent lamps are increasingly driven by electronic

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_th is 0.89V and R_d is 0.165 Ω, therefore substituting these
values in Equation 25, we have:
P_DON = 0.89V *0.29A + 0.165Ω *(0.59A)² = 0.315W
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
Vin(Vac)
400Vdc
Rzcd
NTC
Rmulth
Routh
+
AC
Ccomp
Rmultl
1
IN V
2
C OMP
3
MU L T
4
CS
5
ZC D
6
GND
7
GD
8
VCC
Routl
Rsense
AM17319v1
DocID023984 Rev 2
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