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Will try using Complementary P/N type FDS4559 Mosfet as per your suggestions
for gate driving can use NPN transistors for both N channel and P channel Mosfet. Will use P Channel for PWM speed control and N channel for Direction Control.
Hi all,
I want to drive 24V 2A BLDC motor using Nuvoton MS51FB9AE 8051 controller.
But i am bit confused with the circuit diagram. After going through some of the articles provided online some circuit shows N channel mosfet on High Side and same N Channel mosfet on Low side also. and some...
Yes,
I have even tried the circuit attached.
But the result is the same.
Resistance of LDR in Normal Light is approx 4K and in dark it goes around 500K
Voltage we have is 220V 50Hz
We have also covered the LDR with cover, so that the LED light does not illuminate on LDR
Hi All,
I am trying to built a Night Lamp using LDR which auto lights up the White 2835 3V 4 in series 0.2W LED's when Dark.
The circuit i am using is capacitive power supply.
My problem is when in dark area the LED does not glow to full brightness. it lights up Dim. but when i remove the LDR...
Excatly Got you point.
Will try High side Current sensing as you suggested.
But for high side current sensing
do i have to use P channel mosfet and PNP transistor as per the circuit attached.
For high side current sensing, i have to use P Channel mosfet...??
and even i have tried circuit you sent with alteration. add 1.5K resistor to Transistor E and GND. but the problem is the same. Voltage across the mosfet is 1V
KlausST. can you please let me know why the voltage across the mosfet is 1.12V and not 0.25 as per the datasheet.
How did you make it that the volt across Mosfet would be 1V
As per what i have understood reading the datasheet is Pd is120 degree per watts.
but as per the stimulation you sent, the power consumption of mosfet is approx 116mW when in ON condition. So 120 Degree x 116mW which gives me 13.92 + 25 degree ambient temp which is approx 38.92.
but in actual...
i have gone through the stimulation you sent.
changing the dimmer resistor, also changes the duty cycle. but also will reduce the LED brightness. which i cannot.
For selecting this Mosfet AO3400, i considered the RDSon as it it quite low (33mohms)
because Using 220 Package was not possible because of the limitation of space in PCB.
Hi All.
I Am using a Constant current circuit (Attached) to drive the SMD LED's.
i am using Approx 750mA of Current to drive a LED's with 5V input which is working fine. Mosfet used is SMD SOT23 Package AO3400. My problem is the mosfet gets extremely hot around 70 to 75 degree Celsius within...
I agree with your point and would surely implement MOC3021 opto triac in place of pc817. I think using moc3021 circuit would be a easy part.
Actually in one of my project, where I have to control a single AC motor, I have used the same circuit which worked properly.
But again when I am using 2...
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