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FAN6208 Datasheet(PDF) 8 Page - Fairchild Semiconductor |
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FAN6208 Datasheet(HTML) 8 Page - Fairchild Semiconductor |
8 / 18 page © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6208 • Rev. 1.0.2 8 Function Description Operation Principle FAN6208 is a secondary-side synchronous rectifier controller for LLC or LC resonant converters that drive two synchronous rectifier MOSFETs. Figure 7 is the simplified circuit diagram of an LLC converter. The FAN6208 determines SR MOSFET turn-on/off timing by detecting the drain-to-source voltage of each SR MOSFET. The key waveforms for LLC resonant converter for below resonance and above resonance are shown in Figure 8 and Figure 9, respectively. Figure 7. Simplified Schematic of LLC Converter Figure 8. Key Waveforms of LLC Resonant Converter for Below Resonance Operation Figure 9. Key Waveforms of LLC Resonant Converter for Above Resonance Operation Timing Estimator Figure 10 shows the timing diagram for FAN6208. Once the body diode of SR begins conducting, the drain-to- source voltage drops to zero, which causes DETL pin voltage to drop to zero. FAN6208 turns on the MOSFET after tON-ON-DETL (about 350ns), when voltage on DETL drops below 2V. As depicted in Figure 11, the turn-on delay (after tSR-ON-DETL) is the sum of debounce time (150ns) and propagation delay (200ns). FAN6208 measures the SR conduction duration (tDETL), during which DETL stays lower than 2V, and uses this information to determine the turn-off instant of SR gates of the next switching cycle. The turn-off timing is obtained by subtracting a dead time (tDEAD) from the measured SR conduction duration of the previous switching cycle. The dead time can be programmed using a resistor on the RP pin and the relationship between the dead time and SR conduction duration (tDETL) for different resistor values on RP pin is given in Figure 5. |
Similar Part No. - FAN6208_12 |
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Similar Description - FAN6208_12 |
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