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Hello,
I have a problem with my design. (schematics is attached). In this design, I've incorporated TPS48110 and common source back-to-back fets (current 2 fets but an option to expand to 8 fets - 4 parallel to each side).
the FETS don't open up and with even 1A of the load (resistive) the FETS, which are connected to the sense side are hitting up and burning. the circuit doesn't work as it should and the source-gate voltage are jittering of up to 4 volts. The input voltage is 27-30v
The output capacitors are not installed (to eliminate the capacitor's influence). The electronic load is resistive - 1A
The precharge circuit is built by the separate driver (TPSI4050 and other two back-to-back common source fets) with 5 ohm resistor
The strange thing that I see is that the source voltage is 0 vs the ground.
My questions are:
1. Is the back-to-back with common sources configuration allowed with TPS48110?
2. Any chance that the zener diode (ZD35) connected between the source-gate (for FETs protection) actually causes those troubles? It is rated to 15v
Hello Rakesh,
Many thanks for your advice will do and report.
At this moment could you please provide your view on common sources back-to-back FETs configuration? Is it allowed from a functional perspective? Please confirm.
