DRV8350F: VM and VGLS

Cherry Zhou

Part Number: DRV8350F

Hi team,

Here's an issue from the customer may need your help:

According to the manual, the operating supply VM voltage of the gate driver is displayed in the range of 9-80V, on page 17: The low-side gate drive supply voltage is generated using a linear regulator of the VM supply, which regulates the VGLS output to 14.5V. The VGLS supply is further regulated to 11 V on the GLX low-side gate driver output. The linear regulator powered by VM is 14.5 V.

Is it affected if VM=12V? Is VGLS still equal to 14.5 V? Are there any disadvantages of VM=12V compared to VM=15V?

Thanks.

Best Regards,

Cherry

over 2 years ago

0 Joshua Horlander Cruz over 2 years ago

TI__Mastermind 24570 points

Hi Cherry,

When VM = 12V, the VGLS will be around 11.5V, the VGSL will be around 10.5V, and the max average current VGLS supply will be lowered from 25mA to 20mA. VCP will also see a lower voltage and 20mA max average current.

For information on average current, please see Section 1.5.2 of the Understanding Smart Gate Drive app note.

To see the effects of VM's voltage on the VGLS and VCP regulators output, please refer to section 7.5 of the Datasheet.

Best Regards,

Joshua

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DRV8350F: VM and VGLS