Hi
SN6605B question, the attachment is T4 SPEC, Vin: 5V, Vout: 6V, Iout:> 0.2A. At present, it is found that Vout is 7.4V when starting up, but Vout will slowly drop to 1.24V during the starting process (see the figure below). This power is supplied to U7033 and U7076, but the voltage will still drop when U7033 and U7076 are disconnected. Up to 1.24V, is it caused by T4? If so, is there a suggestion for Turns ratio? Does T4 sense value need attention?
Measuring point
CH1: T4 Pin 4 (frequency is 409.2KHZ)
CH2: Vout