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apenn.13
apenn.13
Associate III
November 23, 2020
Solved

fault IPS160H

  • November 23, 2020
  • 18 replies
  • 5737 views

hello,

I use the component in a board to control gas solenoid valves in a cooking plane.

I need to know for the regulations if in case of any fault or component breakage I always have a low or high impedance output value so as not to always excite the solenoid valve

That is to have a short between a VCC and OUT? or not?

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Best answer by Domenico RAGONESE

Hallo @apenn.13​ 

Both events (hiZ or short) can occur to the integrated power switch between Vcc and Out pins of IPS160H.

You can detect such event on DIAG pin (activated when IN pin is driven low by the MCU) thanks to the "open load detection feature".

However, if you need to guarantee the HiZ in case of any fault (and consequently protect the load), then you need to introduce some redundancy.

I mean, you need another IPS160H (or a P-channel) in series to your IPS160H (you'll have primary switch and secondary switch; the latter connected to the load)

MCU has to check the diagnostic signals and switch off the primary switch in case of short on the power integrated in the secondary switch.

Hope it helps.

Best regards,

Domenico.

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Domenico RAGONESE
Domenico RAGONESE
ST Employee
December 16, 2020

@apenn.13​ 

I can't see any picture attached.

However 150V are fare away for a safe condition for IPS160H: the chip can be destroyed if voltage > 65V is applied between Vcc and GND.

The application components have to protect all the pins of the IC against any violation of the AMR reported in the datasheet.

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