Other Parts Discussed in Thread: LM5160
Hi. I`m making device, where i need to have 15Vout from 24 - 100 Vin. I decided to use LM5161. I tried many designes on TI`s Webench and i ended up at this one:But it doesn`t work. C1, C2, C4 are 1uF foil capacitors for 250V max. C3 has 16V Vmax, but there should be max only 2V on the SS pin. C5 is ceramic capacitor with Umax 200V. C6 is 1uF ceramic capacitor with Umax 16V. So there also shouldn`t be any problems.
I`ve done some simple measurements on my osciloscope, and i found out, that on pin SS isn`t 2V, but approximately 0.2V. On VCC is 7.38V, on BST 9.8V RMS. On FB 0.2V. Do you have any ideas, what i`ve done wrong? Where i`m making mistake? I`ve read datasheet many times, but i can`t find any mistake. Thanks in advance. Jachym