Texas Instruments Demonstration Card for UCC24610 UCC24610EVM-693 UCC24610EVM-693 데이터 시트
제품 코드
UCC24610EVM-693
VC
C
VD
VS
5 V
+
-
R
SYNC
C
SYNC
C
RTN
V
BULK
+
-
SYNC_IN
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CCM Applications
5
CCM Applications
For CCM applications, it is important to feed forward a SYNC signal from the primary side to turn-off the
SR-MOSFET to prevent cross-conduction with the primary-side MOSFET. Attach SYNC “pad” to a
synchronization signal derived on the system board. The
SR-MOSFET to prevent cross-conduction with the primary-side MOSFET. Attach SYNC “pad” to a
synchronization signal derived on the system board. The
controller requires a negative-going
SYNC signal referenced to VCC to trigger turn-off of the SR-MOSFET. This can be achieved with a
low-value capacitor connected from the primary-side MOSFET drain to the SR controller SYNC input. A
series resistor helps to reduce peak currents in the SYNC path. The current return path can be through
existing primary-to-secondary stray capacitance, EMI-suppression capacitance, or a dedicated return
capacitance. See
low-value capacitor connected from the primary-side MOSFET drain to the SR controller SYNC input. A
series resistor helps to reduce peak currents in the SYNC path. The current return path can be through
existing primary-to-secondary stray capacitance, EMI-suppression capacitance, or a dedicated return
capacitance. See
below showing CCM-Flyback application. LLC applications are similar.
Figure 5. Connection Diagram for CCM-Flyback Application
5
SLUU450 – September 2010
UCC24610EVM-693 Secondary-Side Synchronous Rectifier Controller Diode
Replacement Demonstration Board
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