Victor logistics.

[Generalx5]

Originally Posted by Gdeaver

If you want to build a motor driver and are going to use 12 volt or more then there are some single chip solutions that can offer more ability. The victor everybody is familiar with is an open loop design. It provides no feed back or protections. If you going to use a micro controller to command the H-bridge then with a little more work you can have Current feed back, thermal protection and over current protection. With current feed back and knowing the motors current function then you can have sensorless speed control with fair accuracy. For low current motors look at the Freescale MC33887. For more current ability the ST Micro Electronics VNH2SP30 chip offers many features.
Infineon also offers the BTS 7960 and BTS7930. These are half bridge chips.
Pololu.com offers the first 2 chips on carriers and would simplify working with them. They are surface mount and not for bread boarding. Robotpower.com offers the simple H with the BTS7960. The nice thing about the VNH2SP30 is that it only needs the fixed frequency - variable duty cycle PWM on 1 pin. The other chips need 2 PWM outputs from the microcontroler. The next step to this is to control the speed controller over a serial buss. Note that the Lego NXT offers I2c and RS485 for this purpose. May be First and IFI will add some intelligence to the next generation speed controllers.

The chips referred use duty cycle pwm up to 20Khz as input, this would not work with the RC pwm used on the microcontroller...... At least, I think thats right.

As for mosfet types:

http://www.irf.com/product-info/data...a/irf3704z.pdf
The IRF3704Z is a pretty powerful fet. And Current output to power dissapation ratio is fairly good.

Go here if you want to pick your own mosfet specs.
https://ec.irf.com/v6/en/US/adirect/...N=0+4294841672

You can read this guide for pairing up FETS with drivers. Provided by Microchip.com

http://ww1.microchip.com/downloads/e...tes/00799b.pdf