I have a LTM8055 Demo DC2017A, the LTM8055 datasheet shows input can be +5V, but when I add +5V to DC2017A input, the output is only 1.65V; when I rise the input voltage above 5.7V, the output is 12V corrently.
where is the problem? Could anybody help me?
The demo board is designed to start working at 5.5Vin through the R10, R11 resistors on RUN pin. During power-up, you have to take the Vin to 5.5V first then adjust down to 5V in order to get 12V at the output at 5Vin.