All Questions
Tagged with protection mosfet
77
questions
2
votes
1
answer
93
views
High-Side NMOS Short Circuit Protection: How to Calculate Maximal Allowed Turn-off Time?
I'm about to build a high-side MOSFET switch that can switch voltages up to 150V to an external load (0.5A nominal).
For this application I would like to use the N-Channel MOSFET Vishay SiHH240N6E.
...
- 314
1
vote
2
answers
175
views
Operation amplifier input HV protection
I have a setup consisting of 8x AD8428 ultra-low noise opamps on a PCB to measure very small voltages with a noise floor of around some 100uV and a low-pass filter up to 10kHz. The input is connected ...
- 103
0
votes
0
answers
83
views
Reverse polarity protection + inrush current limiting with mosfets schematic
What do you think about this schematic? I want to put this before a DCDC 24 to 5V with maximum 1A. Any comments or suggestions? The aim of this circuit is to have a soft start with the resistor R2 in ...
- 61
2
votes
1
answer
287
views
Reverse polarity protection and inrush current limiting - back to back mosfets
I was testing this circuit in LTspice, it would protect my boards from reverse polarity and limit the inrush current to the input capacitor of a DC-DC (buck or LDO),
but the simulation gave me this ...
- 61
0
votes
1
answer
300
views
How to calculate the gate voltage and Vgs in this N-channel MOSFET reverse-polarity protection circuit?
The schematic below uses an N-channel instead of a P-channel to block reverse-polarity voltage from occurring. This means the gate voltage (and Vgs) must be positive. But there are two options I've ...
- 411
2
votes
2
answers
390
views
Will this NMOS MOSFET reverse-polarity protection circuit work?
Based on the helpful advice from the community, I realised the first schematic I made would not work as a protection for reverse polarity well due to a couple of flaws including the diode having to be ...
- 411
2
votes
2
answers
446
views
N Channel MOSFET reverse voltage protection proposal
While learning how to make a buck converter, I realised that using P channel mosfets for reverse voltage protection is one of the best ways, but I think it could be better using an N channel using the ...
- 411
2
votes
2
answers
913
views
How to limit P-channel MOSFET gate voltage?
While working on my first buck converter I thought it would be a good idea to add reverse-polarity protection. So I went and searched for what would be the best (and easiest) way to do it and found P-...
- 411
1
vote
1
answer
99
views
How to put a decent snubber to the MOSFET?
I am trying to make a soft starter for an inverter to make the turn on process as a yield curve like the one in the photo:
so I used this circuit :
however, the problem is still visible in the turning ...
0
votes
1
answer
45
views
R5613L understandig what MOSFET to use
I want to add a battery-protection to my circuit including a switch to disconnect the battery from the rest. I found the R5613L from Nisshinbo (Manufacturer product site with datasheet).
On page 26, ...
- 339
0
votes
1
answer
160
views
Reverse current blocking for P-channel MOSFET
I'm using a P-channel MOSFET Q57 as a switch for current from VIN_ALW_GATED to +VIN_ALW when VIN_ALW_GATED > 17.259 V.
In case VIN_ALW_GATED was not connected to any reference voltage (floating), ...
- 1,067
1
vote
1
answer
140
views
Reverse polarity protection for 320 VDC, 20 A
I would like to add reverse polarity protection to my robot. Supply is 320 VDC, 20 A max. The load is mainly inductive (DC brushless motors, some DC/DC converters).
A simple solution would be using a ...
- 7,697
2
votes
2
answers
988
views
MOSFET protection scheme for voltage spikes
I would like to understand an overvoltage protection scheme for low-side MOSFETS that seems counter intuitive to me, but is referenced in several sources.
Here is the link to the protection scheme:
...
- 21
2
votes
1
answer
105
views
Failures with MAX16127 chips
Recently I have started using the MAX16127 chip in my designs to protect against overvoltage conditions (Do-160G, Section 16.6.2.4 Category Z, for a very specific condition I am trying to survive, 80 ...
- 21
2
votes
3
answers
817
views
Overcurrent protection for solenoid driver circuit
I need advice on designing an overcurrent protection circuit for a pinball solenoid driver.
I am building new driver boards for several of my games from the late 70s to mid 80s. All use the same board....
- 31