DRV103: PWM to control dutycycle

Dennis Weber

Part Number: DRV103

Hello everyone,

In our application we want to control the dutycycle of the DRV103 with a microcontroller but it has no DAC. Is it possible to drive it with a low pass filtered PWM signal? Also: Can it lead to problems, if a high switched GPIO has to sink current?

I made this to play around with the idea:

https://falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgoqoQFMBaMMAKAEsQAWQz8FPLjxBoBVGPEhgMeBCwBOg3iMXC8okNlzwWAJWEolnKmEJUDY4TTjhohJGFtJj8-YarY0wo1GQSWAYw1PcyCzNR8HCSjosEZybGhiSANOMDxTbmxCMAQnWEkWAHdQ1QFuJXDIIpKQ8uF8KBYAcxV+MqEPCyqWzmJCPjK+8FMfKuLe-rB+FSnRFgAHGu86tvBRlgB7ZBAhKiNiATyIZy2UHd5jBByEcjyJMjtCFHtLM+wWbAEzgDEIJ18QEwQAARACuABcAJ4AHQAzgBhSH+AA2dA+AmwIF+EQkvnggIgOjosLYsPBAEMAHb+NFAA

The resistors are calculated to almost span the entire DRV103 duty cycle range with a control duty cycle between 0 and 100%.

over 3 years ago

0 Kalin Burnside over 3 years ago

TI__Genius 13300 points

Hello Dennis,

The DRV103 Duty Cycle Adj pin will accept an analog signal regardless of the means it is produced as long as it is a stable DC voltage. PWMing the pin is not recommended. Could you clarify your second question?

Regards,

Kalin Burnside

0 Kalin Burnside over 3 years ago

TI__Genius 13300 points

Hello Dennis,

Since you have not responded in two weeks I will be closing this thread. If you have more questions pertaining to this topic please create a new thread.

Regards,

Kalin Burnside

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DRV103: PWM to control dutycycle