Thanks vern! Got your point. Any PWM controller IC that can deliver frequency in the range 8 khz to 20 khz will fulfill my requirement. If I get that IC, my problem is solved for PWM channels. Also, I don't wanted to go costlier by using motor controller ICs unless no choice.
Minhaj On Wednesday, 18 June 2014 22:48:18 UTC+5:30, Vern Muhr wrote: > > If you want to control a BLDC motor, then the PWM frequency should > normally be in the range of about 8 KHz to 20 KHz, fixed frequency. The > TLC59116 is not for controlling BLDC motors. The important features when > selecting the controller are Voltage and Current. Small motors may operate > at 12V / 500mA. A large motor might operate at 300V / 10A. For smaller > motors, there are single chip solutions. For the larger motors, the > controller is split between a driver IC, and individual discrete MOSFETs or > IGBTs. Another important consideration is do you need to actively apply a > braking force to the motor (Referred to as 4 quadrant control), if not then > you can use simpler 2 quadrant control. Check out the International > Rectifier web site. They are the leading supplier of high-end motor control > parts. > > Best regards, Vern > > On Tuesday, June 17, 2014 3:14:00 AM UTC-7, [email protected] wrote: >> >> Hi jmelson ! >> I am making my own cape. >> I have found one PWM controller (TLC59116) from TI >> http://www.ti.com/lit/ds/symlink/tlc59116.pdf >> but it says individual channels are adjustable but with a fixed >> frequency of 97 khz. Would that be enough or adjustable frequency is a must >> feature for BLDC motor. >> >> Datasheet quote: >> >> *Each LED output has its own 8-bit resolution (256 steps) fixed-frequency >> individual PWM controller that operates at 97 kHz, with a duty cycle that >> is adjustable* >> *from 0% to 99.6%* >> >> Please suggest one. >> >> >> On Tuesday, 17 June 2014 02:10:35 UTC+5:30, jmelson wrote: >>> >>> >>> >>> On Friday, June 13, 2014 10:15:33 AM UTC-5, David Anders wrote: >>>> >>>> The PWM Cape provides 32 channels of PWM output, addressed over an I2C >>>> interface. The three pin connectors are wired in a standard servo pinout, >>>> and power to the connectors can be provided from a screw terminal block on >>>> the end of the board. >>>> >>>> the PWM Cape from Circuitco allows you to add 32 PWM channels to the >>>> beaglebone black: >>>> >>>> http://elinux.org/CircuitCo:PWM_Cape >>>> http://boardzoo.com/index.php/beaglebone-black/pwm-cape.html >>>> >>>> These appear to be for radio control servos, and would be generating >>> PWM at a pretty low frequency, like 50 Hz. For running a brushless servo >>> motor, >>> it probably takes PWM at tens of KHz at a minimum. I have some doubts >>> this cape would be suitable for the OP's use. >>> >>> Jon >>> >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
