Questions tagged [high-side]
High-side refers to DC+ positive line.
136 questions
7 votes
3 answers
907 views
Why are p-type MOSFETs used for high-side switching while n-type are used for low side? TO-220 package seems backwards
Disclaimer: Sorry for my ignorance - I'm a computer scientist but not an electrical engineer. It seems at first glance that this designation should be the other way around. N-type MOSFETs have the ...
1 vote
2 answers
92 views
Voltage Clamp Topologies with BJT, Zener
While trying to use MC07XS6517 high-side switch from NXP, in the application section it talks about using a Vcc Clamp after the 5V LDO using a BJT and Zener diode. I have studied a couple of Zener ...
- 31
2 votes
2 answers
95 views
Driving a solenoid with correct freewheeling diodes
I plan to drive a solenoid (2 amps) like this, high-side and lo-side required for diagnostic purposes. I am in doubt about over-voltages produced by (across) inductor when both switches becomes off. ...
- 635
8 votes
3 answers
901 views
What is the purpose of these capacitors on the battery high side?
Please explain what the purpose of the 22u and 0.1u caps are. Why do we require two in series (why not just one that has the equivalent capacitance)? And do we need both the 22u and 0.1u? Also, please ...
3 votes
2 answers
201 views
Switching power to a sensor: High-Side or Low-Side switching
So the first part of this question How to switch power to a sensor has been asked in a few posts before (e.g. here). However, I want to find out a more nuanced part of this question. The setup ...
- 43
2 votes
2 answers
256 views
Anyone tried small transformer to apply drive to the upper or highside? MOSFET in push pull so can use 2 N-channel MOSFET rather than a P-channel
Anyone ever tried small transformer to apply drive to the upper or highside? MOSFET in push pull say for a square wave oscillator so can use 2 N-channel MOSFETs rather than a P-channel Is it really ...
- 261
0 votes
0 answers
84 views
High Side GaN FET Driver with 100% duty capability
I'm designing a power switch that works with GaN FETs in a back-to back configuration in order to prevent from reverse conduction to the main power source. I'm facing an issue where I cannot find a ...
3 votes
2 answers
131 views
High side isolated output PNP driver - how to drive Q1 fully saturated
As a follow up to my previous question here For the following circuit In his answer Fabio stated: During the ON time, Q1 Vce can never fall below its Vbe, since even if opto transistor ON voltage is ...
- 2,032
5 votes
1 answer
212 views
High side isolated output - Zener as freewheeling diode
I saw the other day a circuit that made me wondering: For a 24V output they designed it as following (my reverse engineered drawing): The outputs are switching a bunch of 24V valves around 3W each. ...
- 2,032
4 votes
1 answer
280 views
Half Bridge High Side output stays on when no load is connected
I'm using 2EDL8024G to build a high-side switch, only HO part is used. While this circuit works OK when I PWM it, but the HO seems keep stays on when HI is off (pull to GND). when VIN=13.8V, VCC=12V, ...
- 319
1 vote
1 answer
90 views
Is bootstrapping required for this bridge configuration?
Is this diagram practical for driving the high-side MOSFET?
user494505
-2 votes
2 answers
170 views
How to measure and control the current of a high-side switch [closed]
I'm trying to build a high-side switch circuit with actively adjustable current limit, since I couldn't able to find a suitable current limiting high-side switch controller for that purpose. My idea ...
- 319
3 votes
1 answer
161 views
What happens when battery polarity flipped over my MOSFETs?
I have the following high side switch circuit in a device. By mistake, the 3.6V LTC battery was connected in the reverse polarity (it was connected as drawn in the figure, but the circuit is designed ...
- 559
0 votes
1 answer
118 views
How to drive a metering pump?
I need to drive the 12V metering pump (a solenoid) of the heater in my campervan from an esp32 (because I'm trying to implement this). The pulses have a frequency between 1 and 4Hz (approx.) I didn't ...
- 49
1 vote
2 answers
445 views
What is the best way to drive an isolated high-side MOSFET as a switch, at high bus voltages?
I'm trying to drive an isolated PMOS as a load switch, connected on the high side to a DC bus voltage of 350V. My load requirement is 0-8A varying, but there is bulk capacitance before the load. So ...
- 157