TPS25983: Power supply more that 26V

Stanislav Dittmar

Part Number: TPS25983
Other Parts Discussed in Thread: TPS1663, TPS1685

Tool/software:

Hi! I will supply the TPS25983 from 24V acid lead batterie. This batterie type can have max.voltage till 29V. How can I use this part with this batterie? Is it possible to switch 4x diods between TPS25983 GND and batterie GND (so like a negative protection with a diode) and so reduce the max voltage on TPS25983: 29-4*0.5V=27V?

5 months ago

0 Arush Gupta 5 months ago

TI__Mastermind 39045 points

Hi Stanislav,

Can you share your operating current and any specific feature you are looking for. I can check and recommend another device.

If you want to use this device only, then I can think of some solution but it would be better to use another part if operating conditions allow.

Best Regards,
Arush

0 Stanislav Dittmar 5 months ago in reply to Arush Gupta

Prodigy 20 points

Hello! I need the operating current of 10A and peak current of 16A. Speciall functions are: charge the big capacitor of 300µF (mostly with dv/dt), old in short and hot in short. I think, thats all what I need.

0 Stanislav Dittmar 5 months ago in reply to Arush Gupta

Prodigy 20 points

sorry, capacitor has a 3000µF

0 Arush Gupta 5 months ago in reply to Stanislav Dittmar

TI__Mastermind 39045 points

Hi Stanislav,

I would recommend using 2x TPS1663 in parallel to get 12A steady state current support. This eFuse support 60V input voltage.

Best Regards,
Arush

0 Stanislav Dittmar 5 months ago in reply to Arush Gupta

Prodigy 20 points

12A is not enough for my project. I need 20A.

0 Arush Gupta 5 months ago in reply to Stanislav Dittmar

TI__Mastermind 39045 points

Hi Stanislav,

I think hotswaps controller + external FET will be better solution then. Let me add my colleague who can help you with it. Please expect reply by early next week.

Best Regards,
Arush

0 Stanislav Dittmar 5 months ago in reply to Arush Gupta

Prodigy 20 points

I have already tries LM5069MM with SiR638DP Mosfets and dv/dt. Cold in short ok, cold with capacitance load ok, but the hot in short was not ok, Mosfets were damaged: 2mR shunt resistor and 1k + 220nF dv/dt. What's wrong?

0 Amrit Jit 5 months ago in reply to Stanislav Dittmar

TI__Mastermind 32761 points

Hello Stanislav,

For 24V and 20A, You can check TPS1685. They are easy to stack.

2- TPS1685 would be sufficient. TPS1685 will be available from this week.

Thanks

Amrit

0 Stanislav Dittmar 5 months ago in reply to Amrit Jit

Prodigy 20 points

Hi! Thank you for your reply! Is it possible to attach the blocking Mosfet to block the reverse current to TPS1685? Thank you

0 Amrit Jit 5 months ago in reply to Stanislav Dittmar

TI__Mastermind 32761 points

Hello Stanislav,

There is no blocking FET driver in TPS1685. Although you can connect ideal diode before TPS1685 for reverse polarity protection.

Let me know if you want us to recommend ideal diode part number.

Thanks

Amrit

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TPS25983: Power supply more that 26V