P-channel MOSFET as high-side switch gets hot
Mar 25, 2016 · Let's make some calculations: According to datasheet of IRF4905, it has junction to ambient thermal resistance Rja R j a =62°C. Let's assume ambient temperature Ta T a of 25°C and dissipated power of 1,7W.
power supply - Buck converter MOSFET (IRF4905) heating up
Dec 16, 2019 · I tried to build a buck converter without any ICs, just transistors, a diode and passive components. Its purpose is to convert 12V to 5V at 2 Amps. It works, but the switching MOSFET (IRF4905) heat...
IRF4905 MOSFET getting HOT - All About Circuits
Sep 8, 2018 · I have designed and simulated an Arduino circuit to sequentially pulse six (6) glow plugs. I'm using two units to heat glow plugs on a V12 static engine. I need a Neg ground system and I have included flyback diodes to prevent issues with the 12V starter motor inductive load. The arduino is run...
Urgent-how to switch MOSFET on and off | All About Circuits
Sep 11, 2010 · I need to trigger the mosfet on and off for the circuit shown in the picture.
P Channel couterpart for IRFZ44 - All About Circuits
Jan 4, 2013 · I have looked but don't find an exact P channel counterpart for the IRFZ44 hexfet. Does anyone know what is the best choice? Thanks.
what driver chip do i need for a irf4905 p-channel mosfet
Mar 18, 2021 · I'm trying to figure out what chips I need to run my irf4905. the mosfets will need to be running 5 amps at 24 volts using pwm to Varey the watts. if anyone has done anything with this mosfet an kn...
p-channel mosfet heat dissipation - All About Circuits
Dec 5, 2021 · Hi all, I'm testing a few P-Channel Mosfets (IRF4905) I bought. It's just the most basic setup - see sketch; battery is 15V, Incandescent light is pulling about 1.5A. When the gate is connected to (-), the light goes on and the Mosfet reaches +60deg C. in about a dozen or so second. Rated...
IRF4905 P Mosfet - All About Circuits
Feb 10, 2008 · What reason would you advance for that part having any greater availability than the original. In a global economy there is no reason to limit the availability of parts to just your city, unless there is something else going on.
Soft start circuit design for audio amplifier
Nov 21, 2020 · I have a 100W D class amplifier that runs on 24V. It uses 2 x TPA3116D2 IC for amplification. I also have a 24V 16A power supply. I need to provide a soft start circuit for this, because the amplif...
How to protect P-MOSFET from excessive gate voltage
May 27, 2016 · I have some spare IRF4905 P-MOSFET, some optocouplers, some TVS diodes 18V and various Zeners. My idea was this one (I found no optocoupler in Circuitlab, I made it myself more or less). I omit from the schematic the diode protecting from inverse voltage. simulate this circuit – Schematic created using CircuitLab IRF4905 accepts at most Vgs=20V.