FAN6208_12 datasheet(8/18 Pages) FAIRCHILD

Part #	FAN6208

Description	Secondary-Side Synchronous Rectifier Controller for LLC Topology

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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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.

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FAN6208 Datasheet(PDF) 8 Page - Fairchild Semiconductor

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