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Analog Devices Inc. EVAL-ADPL54203-AZ Evaluation Board

Analog Devices Inc. EVAL-ADPL54203-AZ Evaluation Board is a micropower no-opto isolated flyback converter featuring the ADPL54203. This demo circuit outputs 5V and maintains tight regulation with a load current from 10mA to 2.2A over an input voltage from 10V to 28V. Output current capability increases with the input voltage. ADPL54203 typically needs less than 0.5% of its full output power as a minimum load to maintain good output voltage regulation.

To avoid preloading, the Analog Devices EVAL-ADPL54203-AZ implements a 5.6V Zener diode between its VOUT+ and VOUT– to serve as a minimum load. Transformer leakage inductance causes a voltage spike on the primary side after the power switch turns off. To limit the leakage inductance spike within the MOSFET voltage rating of 60V, an RC snubber and a TVS clamp are installed to dampen the ringing and clamp the MOSFET drain voltage to a safe level.

Features

  • 4.75V to 5.25V output voltage, 5V typical
  • Maintains tight regulation
  • 2.2A maximum output current (minimum)
  • 10V to 28V input voltage range, 24V typical
  • 100mV maximum peak-to-peak output voltage ripple
  • Efficiency
    • 80% at VIN = 10V, IOUT = 2.2A
    • 84% at VIN = 24V, IOUT = 2.2A
  • 345kHz typical switching frequency
  • 12kHz typical minimum switching frequency
  • To avoid pre-loading, a 5.6V Zener diode is placed between its VOUT+ and VOUT– to serve as a minimum load
  • Easily modified for different applications with predesigned transformers
  • RoHS-compliant

Applications

  • Isolated auxiliary/housekeeping power supplies
  • Isolated industrial and medical power supplies

Board Connections

Analog Devices Inc. EVAL-ADPL54203-AZ Evaluation Board

Additional Resources

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Publicado: 2024-03-07 | Actualizado: 2025-05-15