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Depends on which device you're more comfortable/familiar with. Either could do the relatively task.
Hi, more than four possible options, no guarantees at all... SOT-23-5 for: 53 came up with R1223N322H (pwm St-Dwn DC/DC Cnv-Ctr, CE, 3.2V, 500KHz, Reset-Pr.); RN5RZ53AA-TL-FB (Low Noise, LDO, -CE, 5,3V?2%, 100mA); RN5RF53AA (LRip, -CE, 5,3V?2%, 1A*). P63 came up with S-1701B3328-M5T1 (LDO VR, CE, 3,3V?1%, 400mA and VDet 2,8V, -Rese
Your requirement is step down conversion (20VDC to 8VDC) t on/t off = duty is the duty cycle ( Duty = 50% or more generally ) fmin is the minimum frequency Vf is the diode forward voltage drop (.5V) CT is oscillator frequency setting capacitor you can vary the pwm frequency by varying CT value V ripple is the ripple voltage present in the outp
See Proteus output message windows, there is allways a warning with a message like "Simulation is not being performed in real time". moreover, you're not doing the right way, a soft generated pwm as you did will change if you add more routines to run in the main() function.
Hi, it resets the capture/compare/pwm module. As soon as you switch the ECCP module OFF you may use the pins as usual port pins. *** For further, more detailed discussion please write what microcontroller you refer to and/or give a link to the datasheet (@manufacturer) Klaus
Thanks brad.actually i have already built and tested a buck converter on breadboard using Tl494 and Irf1407 with duty cycle 0-100% adjustable.input is variable i.e 16-40 volts and output is 12/14 volts.i provided 24 volts in and adjusted output to 12 volts.with a load of 60 watts on output for 5 mins, fet was totally normal with a very small heat s
Hi am using unipolar stepper motor by using 4 NMOS chip each source connected to ground and each drain connected to corresponding coil and gate from Microcontroller .and common connected to 12v . i dont know the rated current /voltage of this motor , but i measured the coil resistance [common to A pole 2E and A to -A is 4E like in B side also same
Look's like this topic becomes more and more popular here Why do you trying to start work with power electronic? Why don't you want to order devboard or play with Proteus simulation? Really, this will be much cheaper.
I wanna choose a MOSFET for brushless motor controller ( 36 volt , 15 Amps) Which is more important in the selection ? (Power MOSFET for BLDC motor controller , about 20KHz pwm frequency) Low Rds(on) Low Qtotal (gate charge value) Low Resistive Switching Times (tr , tf , ton , toff) Low trr (reverse recovery time ) or ... ? please guide m
This is one of the reason s why you need to fully understand what is actually happening in library functions. That device has two ways of generating a pwm output: one using one of the 4 Output Compare peripherals (which have a pwm mode) and also the Motor Control pwm module that is more complex and flexible. I do not know (...)
If you simply drive the base of a transistor with a voltage then the transistor will conduct more current as it heats up which causes it to draw more current which makes more heat which makes more current until something smokes. Instead you need to drive the LED with a current. Add a resistor in series with the emitter of (...)
Do avoid the noise you could used some form of higher-frequency pwm control that uses MOSFETs and not SCRs such as this, but I don't know if those are avail
There is the resistive drop method. Turn on a transistor to varying degrees, to make the LED brighter or dimmer. Or, you can switch the power to the LED on and off, at varying duty cycle (pwm). This is more efficient than the resistive drop method. There are many ways to achieve pwm.
Actually 30v x 20mA is only 0.5 Watts. As the power output is quite low, pwm is more trouble than its worth. A simple amplifier and DAC as suggested above should work quite well.
Actually I forgot to add one more thing I am using speakers with buit in power supply and amplifier.
LM2576 (52KHz) or LM2596 (150KHz), which one is better for Raspberry Pi power supply (which needs a noise free 5V/2Amps supply from 12VDC (230VAC to 0-12V Transformer)). Only their difference is in pwm. will higher pwm give more noise free output ? Thanks in advance.
Your question isn't clear, please give more information. If you keep the terminal voltage constant, the power supplied is entirely decided by the load current (connected devices) and you cannot control that from the power source. I'm also not sure what you expect to do with pwm unless it is at significantly lower frequency than the single phase su
If you use Linear Voltage control for speed, at half speed the regulator will dissipate more than the motor due to extra drop on LDO. In this example pwm is used with low side driver, which works, but suffers speed control with variable load since switch is off 1-D% of time. thus half bridge using MOSFETs which are both off for 0.5us or so during
Try this code. char i = 0; void main() { TRISB = 0x00; TRISC = 0x00; pwm1_Init(5000); pwm1_Set_Duty(127); pwm1_Start(); while (1) { for(i = 0; i < 256; i += 10) { pwm1_Set_Duty(i); Delay_ms(1000); } for(i = 255; i >= 0; i -= 10) { pwm1_Set_Duty(i); Delay_ms(1000); } } }
Thank you for your reply BradtheRad. The power factor is not a problem for my design. All the values of L in the 200-1000uH interval should work fine. more than the inductor value, my problem is how to build it as a physical component (core, number of turns, etc.) taking into account size, saturation and losses. I am sure that it is possible to b

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