SY23496
Description
Features
SY23496 is a high frequency QR Flyback converter targeting at PD adaptors and fast charges. SY23496 integrates enhancement Ga N FET (650V 0.165Ohm). It is suitable for wide output voltage range application, with maximum 140W output power. Maximum switching frequency can be up to 500k Hz, so size of transformer and capacitors can be reduced.
In normal QR Flyback solutions, valley number always jumps between 1-2 or 3-5, which will increase Vo ripple and bring audio niose. SY23496 can lock valley with proprietary circuit and valley number can be 1 to 6th. System state is more stable than normal QR solutions.
SY23496 works under peak current mode. It adopts QR mode and Ga N FET can be turned on at valley point to reduce switching loss, especially under high input voltage. If load decreases more, SY23496 will enter DCM to reduce switching frequency for higher efficiency. If load is very light, SY23496 will enter burst mode to reduce power loss.
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