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.
