- Joined
- Sep 11, 2011
- Messages
- 249
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- 18
Hello all,
I'm looking to drive my single mode 638nm diode HL63603TG from DTR. I want to drive it at 300mA and be able to PWM it to dim the output from 0-100% duty cycle or somewhere near that at ~10kHz. I'll be using a single cell Li-ion battery which should output 4.2-3.5V.
I thought of using the LM317 as a constant current source but I'm not sure if the LM317's voltage drop is too great since the red diode needs around 3.2-3.3V to operate.
I also thought about using the X-drive buck which has an enable pin for modulation. However, I don't know the maximum PWM frequency that it allows. I'm looking for around 10kHz. It says here that the input voltage of the x-Drive is
If anyone has better ideas or if my ideas are flawed please let me know!
Thanks!
I'm looking to drive my single mode 638nm diode HL63603TG from DTR. I want to drive it at 300mA and be able to PWM it to dim the output from 0-100% duty cycle or somewhere near that at ~10kHz. I'll be using a single cell Li-ion battery which should output 4.2-3.5V.
I thought of using the LM317 as a constant current source but I'm not sure if the LM317's voltage drop is too great since the red diode needs around 3.2-3.3V to operate.
I also thought about using the X-drive buck which has an enable pin for modulation. However, I don't know the maximum PWM frequency that it allows. I'm looking for around 10kHz. It says here that the input voltage of the x-Drive is
so I think using a single cell Li-ion battery would be fine.X-Drive V6 input voltage range is 3.4 to 16.0 volts
SXB-2 all versions input voltage range is 2.8 to 6.0 volts
If anyone has better ideas or if my ideas are flawed please let me know!
Thanks!
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