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AN3112 Datenblatt(PDF) 19 Page - STMicroelectronics

Teilenummer AN3112
Bauteilbeschribung  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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AN3112 Datenblatt(HTML) 19 Page - STMicroelectronics

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AN3112
Designing a fixed-off-time PFC
Doc ID 16820 Rev 3
19/36
this circuit operates in the continuous current mode, the MOSFET has to recover the boost
diode minority carrier charge at turn-on. Therefore, an ultrafast or a SiC rectifier must be
selected.
In this 400 W application an STTH8R06 (600 V, 8 A) can be selected. The STTH8R06 offers
the best solution for the continuous current mode operation due to its very fast reverse
recovery time, typically 25 ns. This part has a breakdown voltage rating (Vrrm) of 600 V,
average forward current rating (Ifave) of 8 A and reverse recovery time (trr) of 25 ns. The
rectifier AVG (
Equation 8) and RMS (Equation 17) current values and the parameter Vth
(rectifier threshold voltage) and Rd (dynamic resistance) given in the datasheet allow the
calculation of the rectifier losses.
From the STTH8R06 datasheet, Vth is 1.16 V, Rd is 0.08
Ω, neglecting the recovery losses:
Equation 37
From
(13) and Equation 37 the maximum thermal resistance to keep the junction
temperature below 125°C is then:
Equation 38
4.3.7
L6564 biasing circuitry
Following the dimensioning of the power components, the biasing circuitry for the L6564 is
also described here. For reference, the internal schematic of the L6564 is represented in
Figure 11. For more detail on the internal functions please refer to the datasheet.
Figure 11.
L6564 internal schematic
rms
2
d
out
th
diode
ID
R
I
V
P
⋅
+
⋅
=
()
W
69
.
1
A
56
.
2
08
.
0
A
0
.
1
V
16
.
1
P
2
diode
=
⋅
Ω
+
⋅
=
diode
ambx
th
P
T
C
125
R
−
°
=
W
C
45
.
44
W
69
.
1
C
50
C
125
R
th
°
=
°
−
°
=



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