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MK91816 Ultra-Fast Turn-off Synchronous Rectifier Controller
The MK91816 is a compact secondary side
synchronous rectifier controller and driver for
high frequency and high-performance flyback
converters. It is compatible with DCM, CCM
and QR operations.
The MK91816 generates its own supply while
used in high-side rectification, which
eliminates the need of external supply
generated by auxiliary winding of the
transformer.
The extremely low 10ns turn−off propagation
delay time and high sink current (~4A)
capability of the driver improve SR VDS stress
at CCM mode.
The unique VG clamping circuit works well to
prevent VG from turning on by fast rising at VD
pin with no VCC, that avoids the shoot through
between primary side and secondary side
during system startup even if the SR VCC is
still below 2V.
Typical Applications
• AC/DC Adapters for Mobile Phone and
Notebook
• High Power density AC/DC Power
Supplie
Features
• Operates in a Wide Output Voltage Range
Down to Zero Voltage
• Self-supply for Operation with Low Output
Voltage and/or High–side Rectification without
an Auxiliary Winding
• Gate Drive Clamp Voltage is Up to 9.5V
• 10ns Fast Turn-off and 25ns Turn-on Delay
• Programable Minimum on time to support wide
frequency range
• VD/HVIN Pin Supports Negative Voltage
Spikes Down to -3V
• VG Clamping Circuit works well for low Vth
Value of MOSFET
• Optimized for up to 1MHz Frequency
• Supports Active Clamp Flyback with GaN FET
or Super-junction MOSFET at Primary Side
• Supports DCM, QR and CCM Operations
• Supports both High-side and Low-side
Rectification
• Adaptive Gate Drive for Maximum Efficiency
• SOT23-6 Package Available
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