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FAN6208 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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FAN6208 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 10 page 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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