Power ManagementのトピックRe: PT2000 current pulse control problem

PT2000 current pulse control problem

Hwanmin — Tue, 16 May 2023 09:18:23 GMT

Hello
Currently, through SPI communication with MPC5777C, MC33PT2000 uses PT2000 dev studio to perform memory fusing using RAM values from which microcodes are extracted. As a result of checking the output of the microcode according to the current START signal, the following problems were encountered.

Currently, I am trying to control the injector using the MC33PT2000 injector driver. First of all, the basic-FRDMPKPT2000EVM appropriately utilized the example code provided by NXP to obtain the current output waveform as shown below.

As a result of checking the ripple of I hold on and I hold off, and I peak on and I peak off current, an error of about 3.8A was found. However, as a result of observing the waveform of the output current by referring to the Bosch document, the current difference of the low ripple current produces an error of 1A. Although the T hold-off value and the T peak-off value were properly adjusted in DRAM, I did not see a decrease in the difference in current.
What parameter must be adjusted in the microcode to display the output with a gap of about 1A for the current difference?

thank you

Re: PT2000 current pulse control problem

Hwanmin — Tue, 16 May 2023 09:20:52 GMT

This is the RAM information extracted from the microcode loaded on the used PT2000.

Re: PT2000 current pulse control problem

TomasVaverka — Sun, 21 May 2023 18:01:01 GMT

Hello,

Your question is currently being reviewed by product experts and we will get back to you with an answer likely early next week.

Best regards,

Tomas

Re: PT2000 current pulse control problem

TomasVaverka — Wed, 24 May 2023 13:02:54 GMT

Hello,

You should see a difference by adjusting the Thold_off time and reduce it. We can see on your scope shot that your Toff time is quite long so when you adjust Thold_off time you should see this duration reduced.

You can write this parameter in DRAM in live using SPIGEN to make sure it is really taken in account.

If it doesn’t work, you can send us the IDE project so we look at the values.

Best regards,

Tomas