DC1745A is an isolated flyback converter featuring the LT3748 controller for high input voltage applications. It is designed for a 15V output at up to 3A from a 100V to 400V DC input.
The DC1745A is a demonstration circuit board designed to evaluate the performance of the LT3748 isolated flyback controller. It is configured to provide a 15V output at up to 3A from a high input voltage DC source (100V to 400V) or a universal AC input (85V to 265V). The circuit eliminates the need for an optocoupler by sensing the isolated output voltage from the third winding of the flyback transformer.
| Output Voltage | 15V ±5% |
|---|---|
| Output Current | 3A |
| Minimum Input DC Voltage | 100V |
| Maximum Input DC Voltage | 400V |
| Minimum Input AC Voltage | 85VAC (RMS) |
| Maximum Input AC Voltage | 265VAC (RMS) |
| Minimum Load Current | 150mA |
| Typical Efficiency (DC Input) | 87% |
| Typical Efficiency (AC Input) | 84% |
A minimum load of approximately 150mA is required on the output to maintain regulation.
Yes, the demo circuit can be powered from a universal offline input of 85V to 265V AC using the AC input terminals.
No, the circuit does not require an optocoupler or signal transformer for regulation.