TB6572AFG*** Toshiba, TB6572AFG*** Datasheet - Page 7

• Manufacturer Part Number: TB6572AFG***
• Manufacturer: Toshiba

Specifications of TB6572AFG***

• Function: Controller
• Vopmax (vm*): 17V (30V)
• Io (lpeak): 20mA
• Sinusoidal Current Wave: yes
• Sensor-less: no
• Speed Feedback Loop: yes
• Package: QFP52
• Rohs Compatible†: yes

The TB6572AFG uses position detection signals to create modulation waveforms, which it compares with
triangular waves to generate sine wave PWM signals.
It counts the time between zero-crossing points for the three position detection signals (electrical angle: 60°)
and uses the time as data for the next 60° phase of the modulation waveforms.
A 60° phase part of a modulation waveform consists of 32 data items. The time width for a single data item
in a 60° phase part is 1/32 of that for the preceding 60° phase part. The modulation waveform proceeds with
that width.
In the above chart, the time between HA rising and HC falling is marked (1). The modulation waveform
within the (1)' period proceeds with a width that is 1/32 of (1). In the same way, the waveform within the (2)'
period proceeds with 1/32 of (2), which is the time between HC falling and HB rising.
If next zero-crossing does not take place appear after 32 data items, the next 32 data items proceed with the
same time width until next zero-crossing occurs.
Timing charts may be simplified for explanatory purposes.
HA
HB
HC
S
S
S
S
A
B
C
B
* t = t (1) × 1/32
*t
*t
(5)
1
2
3
(6)
4
5
6
(6)’
(1)
32 data item
(1)’
(1)’
(2)
7
(2)’
(3)
30
(3)’
31
32
* HA, HB, HC: Hall amplifier
TB6572AFG
2008-1-21