This document is a reference design report for a 36 W continuous, 72 W peak power supply using PKS606YN, with an input of 90-265 VAC and an output of 12 V, 36 W continuous (72 W peak). The application is variable speed motor drive.
This reference design report describes a 36 W continuous, 72 W peak variable output power supply intended for motor‑drive applications. It replaces a two‑stage linear supply with a single‑stage flyback topology and provides motor speed control via a potentiometer or a 3.6 V‑10 V control voltage.
The document includes full specifications, schematics, PCB layout, bill of materials, transformer details, performance data and waveforms, as well as EMI compliance and safety information.
| Input Voltage | 90‑265 VAC |
|---|---|
| Output Voltage | 11.5‑12.5 V ±5% |
| Continuous Output Power | 36 W |
| Peak Output Power | 72 W |
| Efficiency (Full Load) | 80 % |
| Conducted EMI | Meets CISPR22B / EN55022B |
| Safety Standard | UL1950 |
| Ambient Temperature Range | 0 °C – 40 °C |
Motor speed is controllable by a small potentiometer or a 3.6 V to 10 V variable DC voltage.
The design is certified to meet UL1950 safety standards.