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HY903 is a smart digital control synchronous rectifier controller functioning as diode emulator. It drives the standard N-channel Power MOSFET to replace Schottky in order to achieve the high efficiency. HY903 incorporates the digital control technology to optimize the multi-mode operation at DCM/PFM/CCM/QR in the different applications. The digital control technology further enhances the robust CCM operation. Adaptive pre-turning off scheme not only guarantees the fast transition but also minimizes switching loss. The adaptive pre-turn off scheme optimizes the EMI due to the soft SR MOSFET switching off transition. The configurable volt-second threshold through INTG pin avoids SR MOSFET mis-trigger transition due to the parasitic ring under DCM/QR mode. HY903 integrates the multi features to minimize the BOM and optimize the performance.
HY903 is available with SOT23-6 package.
· Low-side synchronous rectification without auxiliary winding
· Supports Multi-Mode operation: DCM, CCM, PFM and QR
· Wide output voltage range: 3-25V
· Integrated charge pump to provide usable gate drive voltage
· High voltage drain sensing up to 120V
· High current gate driver compatible with various MOSFET
· Driver voltage clamped to 8.0V
· Adaptive pre-turn off driver speeding up turn off transition
· Selectable option for T_OFF_MIN
· Self-supply to maintain operation with output voltage as low as 3V
· Shoot through protection (STP)
· Optimized switching loss and EMI
· Low quiescent current
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