TOP250YN low control voltage
I recently replaced a TOP250YN in an amplifier with a TOP250YN flyback topology, nearly identical to Figure 41 on Page 20 of the TOP242/250 datasheet (https://www.power.com/sites/default/files/product-docs/top242.250.pdf)
the main difference in the circuit is that R1 (4.7M) is not in this schematic and C5 and R5 are flipped (C5 on top touching Pin C and R5 below touching Pin S). when the amplifier was working prior, i measured 6.1V on Pin C of the TOP250YN and it was providing all the correct voltages necessary on the output. i put in a brand new TOP250YN and now nothing happens. Pin C only goes to 5.4v and does not hit the 5.8v DC necessary to turn on the device. the output voltage on the flyback transformer only goes to 16v DC when it normally would reach 360v DC when it was operating correctly last time. is my new TOP250YN defective? or do i need to modify the circuit to make this work?