TLV1805: Comparator that works with a power supply voltage of 50V

Conor

Part Number: TLV1805

Hi,

I'm looking for a Comparator that works with a power supply voltage of 50V.
As far as I can see from the TI store, I think the Comparator has a maximum power supply voltage of 40V (such as TLV1805).
・Are there any plans to release a 50V comparator in the future?
・If there are any other solutions, please let me know.

Thanks,

Eevee

11 months ago

0 Chuck Sins 11 months ago

TI__Mastermind 23415 points

Eevee

Thanks for your post. I would like to learn more about your application and system needs. Would you feel comfortable sharing on the forum or would you prefer to share offline?
Chuck

0 Conor 11 months ago in reply to Chuck Sins

Mastermind 8120 points

Hi, Chuck

Thank you for following up.

I used Toshiba's TB6575FNG (BLDC Motor driver) with VM=24V.

Since we are considering driving with VM > 40V, we have selected a new comparator instead of the existing one.

As far as the "functional description guide" below is concerned, the circuit for level shifting is guided.

We are also considering this level shift circuit, but if there is a comparator, we can just change it, so we are looking for it.

If there is a Comparator that supports a 50V power supply voltage, it can be used when driving the TB6575FNG with VM > 40V, so I asked on this forum.

Do you have any solution?

■ TB6575FNG Data sheet
https://toshiba.semicon-storage.com/info/TB6575FNG_datasheet_en_20080911.pdf

■ TB6575FNG functional description
https://www.farnell.com/datasheets/391874.pdf

Thanks,

Eevee

0 Clemens Ladisch 11 months ago in reply to Conor

Guru 243220 points

There is no 50 V comparator. It might be possible to use a high-voltage op amp as a comparator, but you have to check that a large differential input voltage is supported (not all datasheets are helpful), and all 50 V op amps are power op amps in large packages.

There is nothing wrong with the level-shifting voltage divider.

0 Conor 11 months ago in reply to Clemens Ladisch

Mastermind 8120 points

Hi, Chuck

Thank you for your comment.
Are there any 50 V op amps that might be suitable for this application? If there is a circuit example when using the amplifier as a comparator, it is easy to get an image.

Thanks,

Eevee

0 Chuck Sins 11 months ago in reply to Conor

TI__Mastermind 23415 points

Eevee

Thanks for the additional information. Sorry, I am looking at the document provided but I am still not totally sure what the input and output requirements are. From what I am understanding, you need a device that can be powered at 50V so that the input to the device can be up to 50V? What about the output, is this also 50V or is it level shifted down?

Also, what is the speed requirement? Is there a max frequency requirement?

Chuck

0 Conor 11 months ago in reply to Chuck Sins

Mastermind 8120 points

Hi, Chuck

I understand that the current solution is to use an operational amplifier with a high withstand voltage and configure it to output when a potential difference is generated.

Thanks,

0 Chi Nguyen1 11 months ago in reply to Conor

TI__Genius 11326 points

Hi Eevee,

Understood. Sorry we do not have anything at the moment to offer, but of course we would love to hear more about the system needs such as the speed and input/output levels.

0 kai klaas69 11 months ago in reply to Conor

Guru 140200 points

Hi Eevee,

so, we are talking about this comparator?

Kai

0 Chi Nguyen1 11 months ago in reply to kai klaas69

TI__Genius 11326 points

Eevee,

closing this thread for now as we have not heard back but if further support is needed, feel free to reply or open a new thread

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TLV1805: Comparator that works with a power supply voltage of 50V