I designed a super capacitor charger based on BQ24640. The charger has adjustable charging voltage and current. The schematic diagram is basically the same as that provided by the official. It is powered by a DC stabilized power supply.
When the input voltage is 5v, the output voltage can be set normally. When the input voltage is greater than 5v, the output voltage remains around 1.7v and is not adjustable.
May I ask what causes this to happen?