MA850 PWM frequency


I’d bought EVKT-MA850-KNOB .

Its operation looks fine under MACOM, but would you please let me know

how to get PWM frequency=50KHz for MA850?

MA850 data sheet page 5 :PWM frequency =50KHz typ, but my PWM frequency is just 3KHz
My setting may be something wrong?

Thank you for your support.

Best Regards

Dear Kanji Shibatani,
thank You for Your details.
Please provide a readout of the devices register e.g. over the MACOM app.
As a Register Read snapshot or a JSON file.
Best regards,


Dear Marco-san

Thank you for your quick reply!

Here I attached my setting capture.

Should I need some setting with following some procedure… ?
I thought EVKT850-knob is plug& play …

Best Regards

May I have your answer?

Dear Kanji Shibatani,
we are very sorry for the delay and thank You for Your details.
The MA850 You have is a version before January 2017 with a different register set.
This old factory setting provides a 3kHz PWM frequency, not a 50kHz frequency as nowadays and documented.

Please request a new knob EVKT with MA850 (EVKT850-KNOB-Q-01A) from our local field sales, reference to the MPS forum and me if they have questions.

We are very sorry for this situation and the delay.

Beeing courious: what date code does the sensor have?

Best regards,
Marko Hepp

Dear Marco-san

Thank you for your answer. I understood that.
I am just evaluating basic operation of MA850, so no need to have new one.
Thank you for your consideration.

The date code on chip is: AXZG / 35C.

Thank you and with my best regards