Other Parts Discussed in Thread: TPS27SA08-Q1
Tool/software:
Hello E2E Experts,
Good day.
We are working on a board that utilizes the TPS1HA08-Q1 as a high side driver for passing 24V to our low voltage systems. We are having some issues getting the TPS1HA08-Q1 working properly. We only recently realized it was designed for 12V architectures and thus decided to test it at 12V but ran into the same problems. Below is a picture of our schematic.
Test Setup
For our test setup we had VBB supplied by 12V, DCDC Enable powered by a 3.3V line coming from a power supply, DCDC_SEL pulled to ground, DIA_EN pulled up to 5V, and DCDC_SNS is floating (Not connected to an MCU right now). We have connected a 470 ohm load to the output of the high side driver to test it. When we apply 12V to VBB the HSD goes into its diagnostic state as normal. The instance we turn on the enable pin, the HSD turns on for about 500ms (supplying 12V and the appropriate amount of current to the load) before shutting off and going into it's failure state where the SNS line is pulled high (3.4V). We are not sure why it is doing this.
Regards,
TICSC
