In out application, we use 3 TPS2H160-Q1 (Variant A). All devices are supplied by 24Vdc, Rcl is set to 4.3k to limit the current to ~460mA for each channel.
Both outputs OUT1 and OUT2 are connected by a 20k resistor to 24Vdc for open load detection. In general, everything works as expected, but there is a kind of "leakage current" in open load mode we do not really understand - and I can not find a hint in the datasheet. My intention is to find out if we have to accept this leakage current or if we have done something wrong in our application.
In detail, the TPS2H160 consumes 25mA @24Vdc (~0.6W), when OUT1 is not enabled and not connected ("open load detection"). When we connect OUT1 by a 100R resistor to GND, and still not enable the channel, the device consumes only 4 mA. It has something to do with the voltage measured at OUT1 in open load mode. All 3 devices we use show this behaviour, but only at the first channel OUT1. When we use exactly the same configuration for OUT2, we can not measure this current.
For the moment, I would say that this is caused by the TPS2H160 itself. But why are both channels different? Do you have an idea what can cause this additional current?
