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FAN6208 Fiches technique(PDF) 8 Page - Fairchild Semiconductor

No de pièce FAN6208
Description  Secondary-Side Synchronous Rectifier Controller
Download  18 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6208 Fiches technique(HTML) 8 Page - Fairchild Semiconductor

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© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6208 • Rev. 1.0.1
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.
Secondary-Side Synchronous Rectifiers
VIN
LLC Resonant Converter
Lr
IP
Lm
Cr
GND
FD
DETL1 GATE1
FAN6208
GATE2
VDD
RP
DETL2
VO
SR1
SR2
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.


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