Other Parts Discussed in Thread: DRV8847, DRV8850
Is it possible to achieve a sinusoidal o/p current from the DRV8837 by modulating the PWM drive? Or would another device be more suitable (5V Vcc, 1.8A pk)?
Regards
Jim
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Hi Jim,
Yes, it possible. But the DRV8837 may not be the best device depending on the application.
Can you provide more details on your application?
What load are you driving?
What is your desired PWM frequency?
What features of the DRV8837 are desired?
Any other information?
Hi Rick
See below:
What load are you driving? DC Motor
What peak current do you require? 1.2 A peak, 0.9A RMS
What is your desired PWM frequency? 1kHz
What features of the DRV8837 are desired? Sleep Mode
Any other information? Limited space
Thanks
Jim
Hi Jim,
Thank you for the additional information.
Assuming the DC motor is brushed, the following devices are also possible options:
The DRV8847 which has:
A voltage range of 2.7 to 18V
Ability to monitor the current by adding an opamp on the external sense resistor
RDSon of ~500mOhm in parallel (higher than the DRV8837)
The DRV8850 which has:
A voltage range of 2 to 5.5V ( 7V abs max -- this could be an issue)
RDSon of 65mOhm
Ability to monitor the current using the VPROPI output
An integrated adjustable LDO that can provide up to 100mA