New update of my DC-DC boost LED driver (full story you can see here (in Russian)). Added output overvoltage protection (D2,D3) and D1 changed to Vishay 30BQ100. Also I've added simple amplifier for current-sense resistor, so it can be now 1W (1 Ohm for 700mA LEDs, 2 Ohm for 350 mA).
Inductor: 60 turns of 18AWG copper wire on T90-52 core (I've used inductor from dead ATX PSU).
Please note: There is no short-circuit protection for output!
Some other notes.
Some old photos with SF-28 rectifier.
Powering up 12 pcs 3W leds (serial connection) from 12V PSU.
Inductor: 60 turns of 18AWG copper wire on T90-52 core (I've used inductor from dead ATX PSU).
Please note: There is no short-circuit protection for output!
Some other notes.
- Overvoltage limiting 1W zener diodes D2 and D3 may be changed to single 0.5W zener for appropriate maximum output voltage. For example BZX55C47 for max. 47V output.
- Maximum output power depends on primary power supply maximum load capability, current sense resistor R1, MOSFET Q1, inductor coil and flyback rectifier D1.
- This circuit cupports max. 16V input (limit by MOSFET driver).
- NCP3065/66 is more suitable for CC LED driving (lower feedback voltage) but I don't have them now for test.
Some old photos with SF-28 rectifier.
Powering up 12 pcs 3W leds (serial connection) from 12V PSU.
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