I have a TPS2540 charging a new USB C phone. The device reports charging slowly. Using a different charger, the device reports turbo charge, confirming the device is behaving normally. Data connection happens.
The TPS2540 configuration is CDP (CTL1-3 = H) with a 20K ilim (1.5A) and CC1-2 each 5.1K pulldown. Unfortunately, it is only supplying about 70mA.
Attached are the VBUS and D+/-, with an overview and rising VBUS.
What might cause this?