Evaluation Kit for the MAX17690 No-Opto Flyback with Secondary-Side Synchronous Rectification
Simplified Block Diagram
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- 18V to 36V Input Range
- Isolated Output: 5V/3A DC
- Compact Design with High Frequency (200kHz) Switching
- No Optocoupler/Third Winding Required to Derive Feedback Signal
- 89.6% Peak Efficiency
- Galvanic Isolation up to 1500VRMS
- Proven PCB Layout
- Fully Assembled and Tested
- Industrial and Telecom Applications
- Isolated Flyback Converters
- PLC I/O Modules
- Wide-Range DC-Input Isolated Power Supplies
The MAX17690D evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the operation of an isolated 15W no-opto flyback DC-DC converter with secondary-side synchronous rectification. This circuit is implemented using the MAX17690, a no-opto, flyback controller in a 16-pin TQFN package with an exposed pad. The synchronous rectification on the secondaryside is enabled by replacing the secondary diode with a MOSFET to achieve 89.6% efficiency. The circuit uses the MAX17606, a secondary-side synchronous rectifier driver in a 6-pin SOT23 package for driving the secondary-side MOSFET.
The EV kit output is configured for an isolated +5V and provides up to 3A of output current. The EV kit is programmed to operate at a 200kHz switching frequency. The transformer provides the galvanic isolation between input and output, up to 1500VRMS. The EV kit regulates the output voltage within ±5% over the line, load, and temperature without using the auxiliary winding/optocoupler for output voltage feedback.