DRV8106-Q1: DRV8106H-Q1

Hello Jithu,

Thanks for reaching out to us via this forum.

The only way you could achieve this is by following the logic for the control - see table below from the datasheet. Connect IN1 to logic HIGH. Use nHIZ1 as the control input, when this is 0 the HSFET and LSFET will be off. When this is 1 the HSFET will be on and LSFET will be off. If you have our EVM you can try this with it. Thank you.

Regards, Murugavel 

I dont have the EVM to try as i am in design phase.

I wanted to know when i am using 70% PWM. Will HS switch at 70% and LS at 30% or individually i can control HS at 70% without GL1 turning on at 30%?

My application is to drive one high side(HS) switching for motor and another low side(LS) switching for different circuit. Both HS and LS circuits have to be independent. We are looking to control it through same PWM pin as both HS and LS wont work simultaneously. We need driver to switch between activating HS and LS i.e, when motor is there at HS the LS needs to be switched off and when LS is there HS needs to be off. So I want to know if I give PWM( form 20% to 100% duty cycle) can I set whether HS is on or LS is on independently? I have a confusion that this is not possible as it is controlled by single PWM. I believe if I give duty less than 100% the on time will switch HS on and off time will switch LS on. Is this correct?

Hello Jithu,

Jithu T P said:

So I want to know if I give PWM( form 20% to 100% duty cycle) can I set whether HS is on or LS is on independently? I have a confusion that this is not possible as it is controlled by single PWM. I believe if I give duty less than 100% the on time will switch HS on and off time will switch LS on. Is this correct?

Note, conventionally PWM is input to INx and set nHIZ1 HIGH to enable the bridge. This would work like you described. However, the following workaround is to have PWM input on nHIZ1 pin.

Connect IN1 to logic HIGH. Use nHIZ1 as the PWM control input, when PWM is LOW, the HSFET and LSFET will be off or in other words output HiZ. When PWM is HIGH, the HSFET1 will be on and LSFET1 will be off. This would be how a HS driver would work.

If you're using another DRV8106H-Q1 device. You can do the same. If you connect IN1 to logic LOW and ue nHIZ1 as the PWM control input, when PWM is LOW, the HSFET and LSFET will be off or in other words output HiZ. When PWM is HIGH, the LSFET1 will be on and HSFET1 will be off. This would be how a LS driver would work. 

You could use the same PWM if you won't have to drive both the devices simultaneously with the same duty cycle.

Regards, Murugavel  

Ok. I came to same conclusion but had one doubt in this. When i am using with PWM on nHIZ, will it require LS to be on for some time for the capacitor charge pump like bootstrap network?