I have used TPS1H100-Q1 in my design for digital output high side driver. It is configured to be used for
-24v-33v battery supply
- 3A load on each digital output,
- Total 10 digital output hence power budget is 30A, however we have restricted PCB design to 15A total with 15A external fuse rating.
I have few questions.
1. Is Texas Instrument designing or any existing product available as a direct replacement pin to pin TPS1H100-Q1 to achieve extremely low RdsOn , much less then <<<100mOhm. I observed 8mOhm design in preview but it is for 12v battery system.
2. PCB manufacturing cost with specialised pcb of TPS1H100-Q1 is costly and nullifies the benefit of BOM cost of replacement of relay. so, net cost benefit is almost zero. Hence, we would like to see high side driver integrated with normal 1oz copper and without having to use lots of vias and heat sink on pcb, but, still achieve 3A-5A maximum current rating. i.e for 24v-33v automotive battery system.
3. Having only Transil/TVS/Transorb Zener in parallel to battery may not be sufficient as eventually external fuse will blow. Hence, do you have a design suggestion to develop 24v,15-20A power supply for high side driver with minimum BOM and size with following features.
- Reverse polarity protection
- Automative load dump protection.
- E-fuse with 33V max and 15-20A max. [ So that external fuse do not blow ].
Overall TPS1H100-Q1 performance and design is quite good at low cost and lots of value addition of configurable current limit, current sense and diagnostics capabilities.
