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Old Jan 25, 2004, 08:29 AM
KreAture is offline
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Impossible? Hah!
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Oslo Fornebu, Norway
Joined Jun 2003
3,074 Posts
Hi. I've been looking at all the chips selected for theese designs and most of em are not good at all. The 141 chip from ST needs a center-tap to work right.

There is however a great chip from Toshiba called TB6537F. Datasheet avaiable here:
http://www.semicon.toshiba.co.jp/td/..._datasheet.pdf

Basically, this is a fully-fledged brushless controller. It has most of what it needs buildt in.

Features:
- PWM input (wants about 16 khz) for speed controlling
- buildt in startup logic
- stops when no pwm is received (PWM = 0% duty)
- small and light (24 pin SSOP only 0.32 grams!!!)
- over-current protection
- no center-tap needed
- programmable lead angle: 0, 7.5, 15 and 30

Needs:
- 2 external opamps, 1 for OC detection and 1 for commutation wave amplification.
- 1 3-phase driver array or 6 FET's + 3 drivers for the P-FETs.
- crystal/oscillator (1-10MHz)

and a PWM signal!

I am working on getting my hands on one of theese chips. They should integrate very well with any small microchip both AVRs and PICs.

With a 10 MHz resonator max speed should be about as good as the MGM controllers.
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