Can anyone help me design a load switch using the Infeneon IPP120P04P4L p channel MOSFET and the necessary filter components? I would like to use the Texas Instruments ULN2803A darlington driver to drive the MOSFETs gate. Helpful details; Automotive application supplying fuel pump, injector and other hardware. Expected voltage 11 to 16. Electrical noise from alternator. Voltage and current spikes. I would prefer to run switch without heatsink. Thanks.

Edit: I would like design advice and review of this circuit redone directly from Infineon BTF5060-1TEA smart high side power switch data sheet. Has anyone ever used this device before? I intend to use a raspberry Pi 3 to command the appropriate PWM duty cycle to a fuel pump to assist in adjusting fuel pressure through this Smart switch. Fuel pump max current draw will be around 20 Amps. What frequency would you use? Any additional components you would add? Thanks

This is the diagram of the system I’m using TXS0108EPWRG4 level converter but in this case I’m using them as buffers to protect raspberry pi. To monitor current draw and voltage I’m using INA260 power monitors.

enter image description here enter image description here

  • \$\begingroup\$ Given your last question (and my answer) I see you have improved the MOSFET choice but why have you not gone for an automotive high-side switch like this for instance? Given your application (an automotive fuel pump) do you still think it's adequate to use a fairly standard P channel MOSFET? \$\endgroup\$ – Andy aka Jun 9 at 18:58
  • \$\begingroup\$ @Andy This load switch is only to turn on and off the power supply for the fuel pumps PWM driver. I could use either P or N but the P was my way out of not preparing another driver circuit as I already have the ULN2803 although I’m running buffers TXS0108E on the raspberry Pi’s GPIOs. Oh I like that smart switch!! \$\endgroup\$ – Seeedawg Jun 9 at 19:46
  • \$\begingroup\$ So, is this about the same system component as your previous question? \$\endgroup\$ – Andy aka Jun 9 at 20:08
  • \$\begingroup\$ Yes it is, I later realized it wasn’t 100% clear \$\endgroup\$ – Seeedawg Jun 9 at 20:12
  • \$\begingroup\$ For this question, there are plenty of details lacking and most of them are to do with the application being automotive. I'm talking about all the over-voltage protection needed in auto apps as suggested in my previous answer. This is also why folk use high-side switches. Perhaps a block diagram would be useful showing where the device in this question sits in the bigger scheme of the fuel pump control system because nobody coming to answer this will want to talk you through all the safety aspects of not using a single MOSFET for switching off a fuel pump. \$\endgroup\$ – Andy aka Jun 9 at 20:18

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.