Re: [EE] Looking for serial high-side relay driver

DRV104 from TI. "1.2A PWM High-Side Driver for Solenoids, Coils,
Valves, Heaters, and Lamps"
About $3-$5 each from Mouser

There's also a bunch of high-side LED drivers that could likely be
misused for your purpose.
Infineon TLD1120EL comes to mind.


-Denny

On Thu, May 15, 2025 at 1:22 PM Dwayne Reid <[email protected]> wrote:
>
> Good day to all.
>
> I'm retrofitting an existing product that uses lots of 12 dc or 24 Vdc
> relays.  These relays all have one side of the coils grounded and take
> incoming battery supply to activate.  We are adding a pair of cards that
> allows the relays to be controlled over a 4-wire interface (Gnd, Vbatt,
> data, data).  I have not yet decided whether to implement a simple SPI
> interface or RS-485, based on what options the customer wants.
>
> My old standby relay drivers (TPIC6595 or TPIC6C595) are not suitable
> because they are low-side switching.  My question is: is there a modern
> equivalent that does hi-side switching?
>
> Another option is to float several 74HC595 shift registers from the
> incoming battery supply line and use a whole whack of 2N4403 transistors /w
> clamp diodes to drive the relay coils.  I would then probably use
> opto-isolators to get the signals into the chips.  I will do this if that
> is my only option.
>
> Suggestions greatly appreciated!
>
> Many thanks!
>
> dwayne
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