Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

calculating the bootstrap capacitor value

Status
Not open for further replies.
S

sabrahermassi

Newbie level 4
Joined
Apr 29, 2013
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,323
hello!
i was calculating the bootsrap capacitance value of a mosfet driver IR2101 and i was wondering what the operation frequency f means ???
I couldn't find it in the datasheet of the IRF2101 .. well i'm using a mosfet IRF7739l too. can someone help me please in order to calculate the Cboot value needed for my allpication .
i want to drive a brushless motor using STM32F1 microcontroller !!
 

f might be the frequency of the pwm your driving it with. A typical frequency is 16KHz. Not audible to most people.
Any value from 100n to 470n should work ok.
 

I calculated the PWM frequency of my brushless motor using this equation : PWM= [Kv*V*poles]/20 and i found 10Khz . As i know that there is a rule which say that the PWM frequency should be at least 10 times that of maximum frequency of the motor. doeas this mean that i have to choose an operating frequency of 100Khz ??
 

I have never heard of that rule or seen that formula?
You can drive the motor with what ever pwm frequency you like.
 

Should I choose a PWM 's duty cycle of 50% or more in order to drive my motor ?
 

You use the duty cycle to control the speed of the motor.
Changing duty cycle changes motor speed.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top