ONET1130EP: Laser CW mode of operation settings

Nanjunda M1

Prodigy 225 points

Part Number: ONET1130EP
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

5 months ago

0 Drew Miller1 5 months ago

TI__Mastermind 36483 points

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

0 Nanjunda M1 5 months ago in reply to Drew Miller1

Prodigy 225 points

Hi Drew,

Bias Current required is about 200mA.

Regards,

Nanjunda M

0 Drew Miller1 5 months ago in reply to Nanjunda M1

TI__Mastermind 36483 points

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

0 Gopal Krishna 5 months ago in reply to Drew Miller1

Prodigy 20 points

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

0 Drew Miller1 5 months ago in reply to Gopal Krishna

TI__Mastermind 36483 points

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

0 Gopal Krishna 5 months ago in reply to Drew Miller1

Prodigy 20 points

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

0 Drew Miller1 5 months ago in reply to Gopal Krishna

TI__Mastermind 36483 points

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

0 Nanjunda M1 5 months ago in reply to Drew Miller1

Prodigy 225 points

Thanks for the suggestions, Drew.

Regards,

Nanjunda M

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ONET1130EP: Laser CW mode of operation settings