Other Parts Discussed in Thread: LMH13000
Tool/software:
Hi,
I'm looking for the Continuous wavelength (CW) mode laser driver.
Does this part support CW mode (without any modulation)?
Regards,
Nanjunda M
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Tool/software:
Hi,
I'm looking for the Continuous wavelength (CW) mode laser driver.
Does this part support CW mode (without any modulation)?
Regards,
Nanjunda M
Hi Nanjunda,
Do you know how much bias current you will require for your application? Many of our ONET parts have the ability to set bias current or to set a ratio between bias current and PD current. I am wondering if this might meet your requirement.
Thanks,
Drew
Hi Nanjunda,
Devices in the ONET portfolio have a maximum bias current of ~150mA, so these would not be suitable.
I am wondering if LMH13000 might be suitable. Please let me know your thoughts.
Additionally, if your primary need is a current sink/source, you might find this application note helpful.
https://www.ti.com/lit/an/snoaa46/snoaa46.pdf
Thanks,
Drew
Hi Drew,
Thank you for your suggestion. However, we are looking for a driver that operates in constant power mode and can supply sufficient current to drive our laser, ideally around 200 mA.
Please let us know if you are aware of any suitable options.
Thanks,
Gopal
Hi Gopal,
I apologize, but is not clear to me why LMH13000 is not meeting your criteria. This device sinks continuous current from 50mA to 1A. Can you please help clarify?
Thanks,
Drew
Hi Drew
You are correct, but we require the laser driver to operate in constant power mode, whereas the LMH13000 operates in constant current mode only.
Thank you again for your suggestions.
-
Gopal
Hi Gopal,
I understand now, thank you for clarifying.
Our ONET parts are able to implement a constant output optical power by maintaining a ratio between the bias current and PD current.
If your goal is to achieve constant optical power, you could connect your PD to a TIA to convert PD current to voltage and use the voltage to drive the Vset of LMH13000.
Beyond this, I don't have any other devices to suggest.
Thanks,
Drew