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ULQ2003A-Q1: Need suggestion with IC selection

Kiranmayi Prasada
Prodigy 60 points
Part Number: ULQ2003A-Q1
Other Parts Discussed in Thread: TPS1H100-Q1, ULQ2003A, TPL7407L, LM5060-Q1

Tool/software:

We found ULQ2003AQDRQ1 suitable as a low side driver for relays operating at 28V DC. But the limitations of IC are no provision of short circuit protection, over current protection, under voltage and over temperature protection. Please suggest a relevant IC  for our application or a combination of IC's to meet the requirement.

  • 0
    TI__Mastermind 30790 points

    Hi Kiranmayi,

    TI doesn't have any low side switches with enhanced protections. Could you use a high side switch such as TPS1H100-Q1? What are your requirements for operating current and current limit?

    If you need a low side switch in particular (or you will be PWMing the relay at above 1kHz), then I recommend a high side switch upstream from the relay to be enabled steady-state for the protections, then the ULN device downstream for fast PWMing and inductive energy dissipation.

    Will either of these work?

    Thanks,

    Patrick

  • 0 in reply to Patrick Shalton
    Prodigy 60 points

    Hi Patrick,

    Operating current would be 200mA & voltage would be 32V(max) for each relay. ILim=500mA.

    We are not PWMing the relays, they are driven high or low by MCU GPIO using driver IC ULQ2003A which is at the low side of the relay.

    The high side switch in the upstream option was explored but we have limitation of space on board as there are many relays to be driven.

    We further explored TPL7407L, which according to application note  SLLA352 over current protection is achievable but doesn't say anything about over voltage. It would helpful if any such IC(automotive grade) can be suggested that can provide both over-current and over-voltage protection.

    Thanks,

    Kiranmayi
        

  • 0 in reply to Kiranmayi Prasada
    TI__Mastermind 30790 points

    Hi Kiranmayi,

    Would LM5060-Q1 work? It is a type of eFuse that drives external FETs. Or, please see the devices here which are a bit more complex but would cover all the necessary protections.

    Or, TPS4H000 can be used to drive multiple relays, but it lacks overvoltage protection (this can be implemented with a comparator or voltage supervisor).

    Would any of those work?

    Thanks,

    Patrick