I tried to design the LT8330 as my 15V regulator.
But what I found in my circuit was only -15V in TP12 but 0V in TP13.
It ran very good in the simulation.
The VDC_IN is 9V.
Does anyone know what happen?
My best guess is that your coupling cap C140 is open or your hardware does not match the schematic in some way: ohm-out the positive output portion of your circuit to make sure the hardware matches the schematic.
Your question does not make sense in a way - perhaps there is a typo. You say the voltage at TP13 is 0V, but TP13 connects to your resistor divider R119 and R120 which must be working or your circuit would not regulate at -15VOUT.
Your diodes are a little over-sized - 1A average current diodes are sufficient.
I'm attempting to use the LT8330 as a boost converter, following the cookbook schematic on a board that mimics the DC2018A demo board and I'm only getting the supply voltage out of the Schottky diode. I'm looking for an authoritative answer that this chip is not fiction. If it's supposed to work, what's the real solution?
The LT8330 can do 5VIN to 48VOUT according to the datasheet application circuit that I show in the image below. The output current must stay at or below 13mA for 5VIN. Just connect the EN/UVLO pin directly to VIN. If you want to use a resistor divider on EN/UVLO, use 1M for the top resistor in the resistor divider and use 806k for the bottom resistor.
Andy, thank you for the confirmation on the schematic, your post was incentive for me to solder a second board, with a much better job, attention to detail and the circuit is working as advertised. 45.7V and pulls 24mA.
Most grateful, thanks again, Gene
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