TPS61175 is used for 5V to 24V boost converter application. Unfortunately there seems to be an issue with the overcurrent protection mode which breaks our design. 
Our schematic is based on the applications suggestion in the datasheet and uses a switching frequency of around 1.2 MHz. In the attachment TPS61175_overcurrent_issue.zip you find the BOM and different oscilloscope pictures stating the problem we are facing.
Please note that the inductor current is no absolute value as the used shunt resistor was quite temperature depended but it gives an impression of the waveform. The overall input current was measured with multimeter and never exceeded 1,5A.
When starting the TPS without load (picture No 1) the output voltage settles at the required 24V (blue curve). The switching voltage is not in PWM mode which is to be excepted as the datasheet mentions a minimum load requirement.
Setting the load current to 10mA (picture 2) translates to the PWM mode.
Now increasing the load up to 130mA shows how the inductor current rises.
But then, at 140mA the switching voltage breaks down, the PWM frequency drops to 290kHz (1/5 of the set frequency) and the output voltage drops to around 6,8V. This seems to be the overcurrent protection mode.
I’m not sure why this feature is activated as we are clearly well away from the required minimum current of 3A according to datasheet.
Additionally this state persists even when the current is lowered again (pictures 8 to 12). Only when completely removing the load does the output voltage rises to 24V again and a new load can be applied.
This issue is seen on several boards.
BR Bernd
