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ML4822IS 데이터시트(PDF) 7 Page - Micro Linear Corporation

부품명 ML4822IS
상세설명  ZVS Average Current PFC Controller
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제조업체  MICRO-LINEAR [Micro Linear Corporation]
홈페이지  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4822IS 데이터시트(HTML) 7 Page - Micro Linear Corporation

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ML4822
7
Q1 Turn-On
The turn-on event consists of the time it takes for the
current through L2 to ramp to the L1 current plus the
resonant event of L2 and the ZVS capacitor. The total
event should occur in a minimum of 350–450ns, but can
be longer at the risk of increasing the total harmonic
distortion. Setting these times equal should minimize
conducted and radiated emissions.
tQ1(OFF) = tIL2 + tRES = 400ns
(1)
Where IL2 is equal to IL1.
The value of L2 is calculated to remain in discontinuous-
mode:
L
VV
t
P
BUS
RMS MIN
IL
OUT
2
2
2
=
××
×
()
(2)
The resonant event occurs in 1/4 of a full sinusoidal cycle.
For example, when a 1/4 cycle occurs in 200ns, the
frequency is 1.25MHz.
f
LC
t
RES
ZVS
RES
=
×
=
×
1
22
1
4
π
(3)
Rearranging and solving for L2:
L
t
C
RES
ZVS
2
4
2
2
=
×
×
π
(4)
The resonant capacitor (CZVS) value is found by setting
equations 2 and 4 equal to each other and solving for
CZVS.
C
tP
VV
t
ZVS
RES
OUT
BUS
RMS MIN
IL
=
××
×
××
×
42
2
2
2
π
()
(5)
APPLICATION
Figure 3 displays a typical application circuit for a 500W
ZVS PFC supply. Full design details are covered in
application note 33, ML4822 Power Factor Correction
With Zero Voltage Resonant Switching.
Figure 2. Timing Diagrams
t2
t3
t1
A. SYSTEM
CLOCK
(INTERNAL)
B. RTCT
C. ZVS GATE (Q2)
D. VDS (Q2)
E. PFC GATE (Q1)
F. VDS (Q1)
G. IL2


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