High voltage power mux

Hi Gaurav, do you have a TI device in mind?

Hello,

I was hoping to get this answer from the TI application engineers. maybe there is high voltage gate driver that can be used with external mosfets? can you check internally with other engineers? Thanks

Hey Gaurav,

Are you looking for a half-bridge gate driver?

We have a few in our portfolio that would work in that case. These are the UCC2771x series such as the UCC27710, UCC27712, and UCC27714. These are 600V half-bridge drivers with varying output currents.

Could you share more about your system such as a block diagram or schematic so that I can promote the correct gate driver?

Let me know if you have any questions.

Thank you,

William Moore

something like the TPS2117 but the input voltage sources are identical 360VDC which I have to mux. any one is primary and other is secondary that takes over when teh 1st one shuts down/fails. Max current is 6A. I can also use external mosfets to control if integrated solution is not possible becaouse of high voltage.

Thanks.

Hey Gaurav,

Yes with these gate drivers, external MOSFETs would be needed for switching the load. We do not have an application note on this that I am aware of though, but any of the aforementioned gate drivers are suitable for 360VDC.

Is this a 100% duty cycle system in steady state? If so, a high-side bias circuitry will need to be implemented for these half-bridge gate drivers.

Let me know if that is the case and if you have a block diagram or any other questions regarding this.

Thank you,

William Moore

Hello,

block diagram is attached. I am trying to OR two HV power supplies 360VDC each). V1 is higher priority and V2 is switched in when V1 is lost. A comparator is used to switch. I was initially using Pmosfets but at this voltage they have a very high RDSon and doesnt make sense to drive a 6A load. N channel is more preferable, but they will need a gate drive higher than 360V to enhance fully and provide lowest Rdson. The mosfets have to be connected such that even if both mosfets are off, the body diode can provide the load for a short time till the mosfets turn on. so, essentially I just need a gate driver that can drive the nchannel mosfets (could be a charge pump too. Ctrl1 and ctrl2 are derived from the comparator. let me know if anything comes to mind. Thanks. 

Hey Gaurav,

Looking at this, I think a solid state relay from our power switches team may be more applicable here so I am going to redirect you to that team for this question.

Thank you,

William Moore