TPS40170: TPS40170

I would double check your component values and your PCB layout.
Also, be sure that your input supply is OK.

Hi,

 I double check the component and there are ok. concerning layout, it could be a problem but doing the measurement once more time, the Voltage at the HDRV or SW goes to ca. 50V by turning on the HIGH-Side MOSFET with 24V Supply only for small time and go back to ca. 2V. This keep on repeating with a frequency of 820Hz. The voltage at the VBP is 8V and at VDD is 3.3V

the LDRV is switching between ca. 1V and 0V for 820Hz.

This is very strange behavour. I would check to
make sure that the device is soldered down correctly and maybe replace the device
with a fresh one.

It would be good to see a snapshot of your layout.

It is really strange for me too. I though it could be soldering problem and I have to send it to the soldering company because the soldering was done per hand.

Joined is the layout. Do not take care of the "LastAnschluss" because it just a MOSFET to control my Load.

I assume you have a top and bottom ground plane pour.
The gate connections could be a little wider.
I do not see where the AGND and GND are connected??
The AGND and PGND and the DAP should be connected.