Hello,
I have soldered a DRV2700 chip into an adapter and added components around it on a breadboard - please refer to the scheme below including the voltages I've measured at the pads. However, I can't observe any switching or inductor current. Based on my measurements I believe
1. The charge pump is working (voltage on the pin is higher than the supply voltage).
2. The voltage on the BST pin is ~ 1 diode drop less than the supply voltage, so I believe that current can go through the inductor and the internal diode.
3. The feedback voltage is right.
4. The enable pin works (EN = 0, Isupply = 0 mA; EN = 1, Isupply = 4 mA)
So the thing that doesn't appear to work is the internal transistor switching on and off. I'm out of ideas and I'd be very grateful if someone could provide any tips on the debugging.