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UCC27518: Difference with UCC27519?

AnBer
Mastermind 29625 points
Part Number: UCC27518
Other Parts Discussed in Thread: UCC27519

Team,

Note: it is known that the IN pin is CMOS level and the EN pin TTL level

-In order to use UCC27518 as alternative to UCC27519:
Can the enable pin be used as a non-inverting input and the IN pin as an enable pin (connected to GND)?


-Is there a way to re-design a UCC27519 PCB/system and use UCC27518 as a UCC27519 (ie non-inverting)?
-Could you please propose a potential schematics for this?

Thanks in advance,

A.

  • 0
    TI__Genius 11770 points

    Hello A,

    Can the enable pin be used as a non-inverting input and the IN pin as an enable pin (connected to GND)?

    Yes, check out figure 4 in section 8.6 on page 9 of the datasheet. The main difference between driving enable and inputs is that inputs are held low(technically high for the inverting pin so that the output is low) while floating, and enables are held high. 

    -Is there a way to re-design a UCC27519 PCB/system and use UCC27518 as a UCC27519 (ie non-inverting)?

    You can do what you suggested in the first question, where you essentially use IN as an enable and use EN as a non-inverting input. Alternatively, you could use a logic inverter or make a discrete one with a pulldown. I think the first option will deliver good results with no/minimal PCB changes though (depending on your controller), so that is probably your best option. If you are interested in the logic inverters, I can provide details, but those solutions will require extra components and not add much value over the first option.

    thanks,

    Alex M