LT3741 High Power Constant Current, Constant Voltage Synchronous Buck Controller Demonstration circuit
The DC1602A demonstration circuit is designed to evaluate the performance of the LT3741 High Power Constant Current, Constant Voltage Synchronous Buck Controller. The board is optimized for a 20A output from a 12V input and is intended for use with high-power LED loads, such as the PT120 from Luminus Devices. The output current is regulated until the output voltage reaches a programmed limit of approximately 6V. Due to the use of 30V MOSFETs on the board, the maximum recommended input voltage is 24V, although the LT3741 chip itself supports up to 36V.
| Input Supply Range (Demo Board) | 12V to 24V |
|---|---|
| Output Voltage Limit | 6V |
| Output Current | 20A |
| Switching Frequency | 380 to 460 kHz |
| Typical Efficiency | 94% |
The ideal load is a single high-power LED, such as the PT120 from Luminus Devices, because smaller LEDs may not handle the high current.
The maximum recommended input voltage is 24V, even though the LT3741 chip supports up to 36V, because the demo board uses 30V MOSFETs.
The output current can be adjusted by varying the CTRL1 voltage.