As you said it is not turning fully on (too low a drive voltage on the gate) or the PWM frequency/waveforms are too fast (no fast mosfet drivers), and the Fets gate capacitance is meaning it doesn't have time to fully turn on and off, and so is getting very hot with the ...
Gradually increase the voltage by turning the pot and measure the voltage across the LOAD. When the voltage is equal to full rail voltage, the FET is fully turned ON. Perform this operation as fast as you can to prevent the FET heating up. Hold your finger on the FET and reduce the vo...
Gradually increase the voltage by turning the pot and measure the voltage across the LOAD. When the voltage is equal to full rail voltage, the FET is fully turned ON. Perform this operation as fast as you can to prevent the FET heating up. Hold your finger on the FET and reduce the vo...
the source is a +48V battery, the fault was only found on high side MOSFETs, source and drain were shorted internally after turning on the circuit, VCC is +12V, there was no waveform, just a constant high pulse sent from microcontroller (I believe that was the issue), but I'm not ...
At the beginning of turning−on of the IGBT/MOSFET, the collector−emitter / drain−source voltage is much higher than the saturation voltage level which is present after the IGBT/MOSFET is fully turned on. It takes almost 1 ms between the start of the IGBT/MOSFET turn−on and the...
I fully agree with Crutschow's comments. I suppose if it really is a triac (an SCR would be more appropriate) and it really does run on DC, it is possible the horn is a type that draws intermittent current through magnetically operated but spring returned contacts. That might be enough...
Below is an example circuit for turning on a MOSFET. To turn a MOSFET transistor on, you need a voltage between gate and source that is higher than the threshold voltage of your transistor. For example, the BS170 has agate-source threshold voltageof 2.1V. (You’ll find this info in the...
When the primary switch T1turns on at time t2′, the MOSFET T2is prepared, i.e., most of the gate charge has been drawn off and the MOSFET T2is not fully conducting. Thus, no reverse current spike will appear across the MOSFET T2at time t2′ as apparent from FIG.2B. ...
These are both turn-on and turn-off gate losses. Most of the power is in the MOSFET gate driver. Gate- drive losses are frequency dependent and are also a func- tion of the gate capacitance of the MOSFETs. When turning the MOSFET on and off, the higher the switching frequency, the ...
When the low-side MOSFET turns on, the SW voltage is nearly 0 V. When the low-side MOSFET turns off, the SW voltage is about -0.7 V. At the procedure of low-side MOSFET turning on or off, SW voltage does not change too much and does not produce large overshoot or undershoot. For...