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FAN6208 Datasheet(PDF) 2 Page - Fairchild Semiconductor

No. de pieza FAN6208
Descripción Electrónicos  Secondary-Side Synchronous Rectifier (SR) for LLC Resonant Converter
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6208 Datasheet(HTML) 2 Page - Fairchild Semiconductor

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AN-6208
APPLICATION NOTE
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 3/10/11
2
LLC Resonance Converter with SR
Figure 2 shows the simplified schematic of a half-bridge
LLC resonant converter, where Lm is the magnetizing
inductance that acts as a shunt inductor, Lr is the series
resonant inductor, and Cr is the resonant capacitor. Since the
magnetizing inductor is relatively small, a considerable
amount of magnetizing current (Im) exists, which freewheels
in the primary side without being involved in the power
transfer. The primary-side current (Ip) is sum of the
magnetizing current and the secondary-side current referred
to the primary.
Figure 3 shows the typical gain curve of the half-bridge
LLC resonant converter. To allow Zero Voltage Switching
(ZVS) for the primary-side switches, gain curves with
inductive impedance characteristics should be used, where
the gain decreases as frequency increases. The resonant
network has a resonant frequency determined by the
resonance between Lr and Cr. When the switching frequency
is lower than the resonant frequency (below resonance), the
half resonance of reflected secondary-side current (diode
current) finishes before the primary-side switch is turned
off, as shown in Figure 4. When the switching frequency is
higher than the resonant frequency (above resonance) the
primary-side switch is turned off before the half resonance
of reflected secondary-side current (diode current) is
completed, as shown in Figure 5.
Figure 2. Schematic of LLC Resonant
Converter with SR
/
r
r
ac
L
C
Q
R
=
1
2
o
r
r
f
L C
π
=
Figure 3. Typical Gain Curves of LLC
Resonant Converter
Q1 Gate
Q2 Gate
Im
IP
VSR2
2*Vo
SR On-time
SR1 Gate
ID
ISR1
ISR2
Figure 4. Key Waveforms Below -Resonance Operation
Figure 5. Key Waveforms of Above-Resonance
Operation


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