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FAN9612 数据表(PDF) 5 Page - Fairchild Semiconductor

部件名 FAN9612
功能描述  Design Consideration for Interleaved Boundary Conduction Mode PFC
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FAN9612 数据表(HTML) 5 Page - Fairchild Semiconductor

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AN-6086
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.4 • 4/22/10
5
Therefore, once the output voltage and minimum switching
frequency are set, the inductor value is given as:
2
,,
,,
2
2
LINE MINF
OUT
LINE MINF
OUT CH
SW MIN
OUT
VV
V
L
Pf
V
η ⋅−
=⋅
⋅⋅
(6)
where VLINE,MINF is the RMS line voltage that results in
minimum switching frequency.
For universal input range, VLINE,MINF is the maximum line
voltage (265VAC) when VOUT is set at lower than 405V;
while VLINE,MINF is minimum line voltage (85VAC) when
VOUT is set at higher than 405V.
As the minimum frequency decreases, the switching loss is
reduced, while the inductor size and line filter size
increase. Thus, the minimum switching frequency should
be determined by the trade-off between efficiency and the
size of magnetic components. The minimum switching
frequency must be above the minimum frequency of
FAN9611/12, which is set at 16.5kHz to prevent audible
noise.
Once the inductance value is decided, the maximum peak
inductor current at the nominal output power is obtained as:
,
.
,
22
OUT CH
LPK
LINE MIN
P
I
V
η
=
(7)
where VLINE,MIN is the minimum line voltage.
The number of turns of boost inductor should be
determined considering the core saturation. The minimum
number is given as:
,
LPK
BOOST
e
I
L
N
AB
⋅Δ
(8)
where is Ae is the cross-sectional area of core and ΔB is the
maximum flux swing of the core in Tesla.
ΔB should be set
below the saturation flux density.
Figure 8 shows the typical B-H characteristics of ferrite
core from TDK (PC45). Since the saturation flux density
(
ΔB) decreases as the temperature increases, the high
temperature characteristics should be considered.
Figure 8. Typical B-H Curves of Ferrite Core
(Design Example)
Since the output voltage is 400V, the
minimum frequency occurs at high-line (265VAC) and
full-load condition. Assuming the efficiency is 95% and
selecting the minimum frequency as 52kHz, the inductor
value is obtained as:
2
,,
,,
2
3
2
2
0.95 265
400
2 265
202
400
2 200 52 10
LINE MINF
OUT
LINE MINF
OUT CH
SW MIN
OUT
VV
V
L
Pf
V
H
η
μ
⋅−
=⋅
⋅⋅
⋅−
=⋅
=
⋅⋅ ×
The maximum peak inductor current at nominal output
power is calculated as:
,
,
,
22
2 2 200
7
0.95 85
OUT CH
LPK
LINE MIN
P
I
A
V
η
==
=
⋅⋅
Assuming PQ3230 core (PC45, Ae=161mm
2) is used and
setting
ΔB as 0.3T, the primary winding should be:
6
,
6
7 202 10
29
161 10
0.3
LPK
BOOST
e
IL
N
turns
AB
⋅×
≥=
=
⋅Δ
×⋅
Thus, the number of turns (NBOOST) of boost inductor is
determined as 30 turns.
[STEP-2] Inductor Auxiliary Winding Design
Figure 9 shows the inductor current and voltage waveforms
of a BCM boost converter. FAN9611/12 indirectly detects
the inductor zero current point using an auxiliary winding
of the boost inductor. Since the zero current detection
(ZCD) circuit in FAN9611/12 is designed to turn on the
MOSFET when the slope of auxiliary winding voltage
becomes zero, no special consideration for timing delay is
required for the auxiliary winding design.
AUX
IN
BOOST
N
V
N
()
AUX
OUT
IN
BOOST
N
VV
N
Figure 9. ZCD Detection Waveforms
The voltage of the ZCD pin is clamped near zero and the
resistor RZCD limits the current of the ZCD pin below 1mA as:


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