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RT7220D

Richtek
Part Number RT7220D
Manufacturer Richtek
Description Synchronous Rectifier Controller
Published Dec 9, 2023
Detailed Description RT7220D Synchronous Rectifier Controller with Zero Voltage Switching for Wide Output Voltage Operating Range General D...
Datasheet PDF File RT7220D PDF File

RT7220D
RT7220D

Overview
RT7220D Synchronous Rectifier Controller with Zero Voltage Switching for Wide Output Voltage Operating Range General Description The RT7220D is a Synchronous Rectifier (SR) controller for Flyback converters operating in Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM) and Quasi-Resonant (QR) mode.
The RT7220D will sense the drain voltage of MOSFET to determine SR gate on/off so as to minimize turn-off dead-time and enhance efficiency.
The RT7220D supports the wide output voltage range from 3V to 21V, and a HV LDO is especially built-in for the MOSFET gate driver at low output voltage.
When it works with the primary-side controller RT7757, the Zero-Voltage-Switching (ZVS) control can be enabled to optimize the efficiency at high line.
Furthermore, the RT7220D provides a green mode operation in light load condition, which reduces operation current to be under 250A.
Ordering Information RT7220D Package Type QW: WQFN-16L 3x3 Lead Plating System G: Green (Halogen Free and Pb Free) RT7220D Version (Refer to Version Table) Note: The products are:  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Features ⚫ Suitable for Flyback Converter in CCM, DCM and Quasi-Resonant (QR) Mode ⚫ Suitable for 3V to 21V VOUT Range ⚫ ZVS Function to Optimize Efficiency (Work with the Primary-Side Controller RT7757) ⚫ <1.
65mA Operating Current in ZVS Mode ⚫ <250A Operating Current in Green Mode ⚫ Built-in HV LDO to Supply SR Driver when VOUT Lower than 5V ⚫ Automatic Dead-Time Tracking Control to Optimize Efficiency ⚫ Protection  SR Gate Driver with 6V Clamp  SR Gate Initial Pull-Low before Start-Up  SR Minimum Off-Time  Fast Turn-Off (<50ns) Gate Driver Applications ⚫ USB PD Power Converters ⚫ Fast-Charger Power Adapeters ⚫ General Purpose High-Efficiency and/or Compact- Size Flyback Power Converters Copyright © 2023 Richtek Technology Corporation.
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