Solar Mike
New Member
I came across a great new half bridge driver chip that has user set dead-time and only requires a single PWM input; its the Silicon Labs Si823H4BB-IS1. The chip also has internal input isolation, so is fully isolated from the cpu and its low level control signals, making it a great candidate for building a fully synchronous MPPT PV charger.
I have always wanted to build a design that incorporated the new range of multi-source pin smd mosfets in the D2Pak-7 series, these have low RDSon and low lead inductance, so will be quite efficient at high power levels. The three used here are the NTBGS4D1N15MC, 150V, 185A, 0.0041R, heat is conducted through the pcb, which is clamped via an insulator to a 25mm x 25mm alloy bar bolted to the alloy case as a heatsink. This prototype is only using 1oz copper board so have added some tinned areas to allow soldering extra copper wire to the high current carrying traces. All high current areas are located in the top half of the pcb, low level cpu and controls have their own isolated earth plane with a single point connection to main 0v.
Driver Chip:
Schematic:
PCB:
Will send these off to me made, pending delays for Chinese New Year holidays.
Cheers
Mike
I have always wanted to build a design that incorporated the new range of multi-source pin smd mosfets in the D2Pak-7 series, these have low RDSon and low lead inductance, so will be quite efficient at high power levels. The three used here are the NTBGS4D1N15MC, 150V, 185A, 0.0041R, heat is conducted through the pcb, which is clamped via an insulator to a 25mm x 25mm alloy bar bolted to the alloy case as a heatsink. This prototype is only using 1oz copper board so have added some tinned areas to allow soldering extra copper wire to the high current carrying traces. All high current areas are located in the top half of the pcb, low level cpu and controls have their own isolated earth plane with a single point connection to main 0v.
Driver Chip:
Schematic:
PCB:
Will send these off to me made, pending delays for Chinese New Year holidays.
Cheers
Mike