BUF602: Stable with capacitive loads ?

Hello Patrick,

Great work so far investigating your use case here, thank you for providing all the details.  I am going to take a look at simulation and check across my team on any data or bench validation we have done on capacitive load.

While I may not be able to provide an overall rule of thumb, I can always take a look in lab if you have specific values for BUF602 capacitive load.  I imagine 1uF is a key value, but are there any additional values between 0uF and 1uF you would like me to think about?

Best,

Alec

Hello Alec,

Thanks for replying so fast. 100nF is the typical use case. I took the range 0 to 1µF to be sure.

For future designs I would like to know up to which capacitive load this device would stay stable if so. It's a very handy device.

Regards,

Patrick

Hello Patrick,

Thank you for sharing your typical values as well as max/min.  I can work on this and provide an update for what capacitive loads are able to be kept stable with BUF602.

Best,

Alec

Hello Alec,

Do you still need some info to be able investigating this topic ?

Thanks for your answer.

Regards

Patrick

Hello Patrick,

I have not been able to test this on bench in the lab for stability.  I do agree your simulation results appear in order and do suggest stability across the range of 0 to 1uF.

I will have time to dedicate to this on middle-end of this week.   I did find an older thread where we established stability analysis via TINA as a way to understand capacitive loading.  You are already doing this with your approach, which is a good sign that it is reasonable.

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/805849/buf602-buf602-as-capacitive-gate-load-driver

I will prioritize checking 100nF capacitive loading and I am going to see what I can offer in terms of a guiding range on cap values.

Best,

Alec

Hello Alec,

Didi you already have the chance to look further on this topic ? I'm very eager to know whether the BUF602 remains stable ?

Best regards,

Patrick

Hello Patrick,

I have not yet had time to look more on our discussion of load capacitance.  I will check with my team for hardware and let you know if I can get data early next week.

Best,

Alec

Hello Alec,

May I ask whether you had the chance meanwhile having a look to this topic with your team ?

Thanks for your answer.

Regards,

Patrick

Hello Alec,

I'm not sure I did fully understand your answer. Can you give me a precise statement about the simulation model itself and the tests you did, both related to this topic ? Thanks.

Best regards,

Patrick