Tool/software:
Hi,
In the case of this IC, I believe the motor voltage: VM = VCC.
If the back-EMF of VM causes AOUT/BOUT to exceed the VCC voltage, to what extent is it tolerable?
The rated VCC is 7V, so I think it is correct to consider the tolerance range to be 7V.
A customer enquired about the rated voltage of AOUT/BOUT, so I asked just to be sure.
In the customer's system, a voltage that exceeds VCC is observed when AOUT/BOUT rises (but only for a very short time).
Best regards,
Hiroshi
Hi Hiroshi-san,
Thank you for your question.
The absolute maximum for this device is 7 V. Generally speaking VM / VCC must not exceed 7 V to ensure device integrity over its lifetime. What is the operating VCC of the application?
In the customer's system, a voltage that exceeds VCC is observed when AOUT/BOUT rises (but only for a very short time).
This happens when the VBEMF is conducted by the FET body diode to VCC. This is expected behavior. Very short excursions (μs) are tolerated by the body diode and the device and does not cause any device damage. However if the peak amplitude exceeds 1 V (one diode drop) because of fast edges, customer can use four Schottky diodes one each across the H-Bridge FETs to mitigate the spike amplitude. Most cases would not require this Schottky diode. Thank you.
Regards, Murugavel
