TB6556FG Toshiba, TB6556FG Datasheet - Page 15

• Manufacturer Part Number: TB6556FG
• Manufacturer: Toshiba

Specifications of TB6556FG

• Function: Controller
• Vopmax (vm*): 7V (12V)
• Io (lpeak): 2mA
• Sinusoidal Current Wave: yes
• Sensor-less: no
• Speed Feedback Loop: no
• Package: SSOP24
• Rohs Compatible†: yes

with the triangular wave and a sine-wave PWM signal is generated.
falling (or rising) edges is counted. The counted time is used as the data for the next 60° phase of the
modulation waveform.
item is 1/32 of the time width of the 60° phase of the previous modulation waveform. The modulation
waveform moves forward by the width.
time (1) from HU: ↑ to HW: ↓. Similarly, data (2)’ moves forward by the 1/32 time width of the time (2) from
HW: ↓ to HV: ↑.
same time width until the next edge occurs.
every 60° electrical angle. Thus, when the Hall device is not placed at the correct position or during
acceleration and deceleration, the modulation waveform is not continuous at every reset.
There are 32 items of data for the 60° phase of the modulation waveform. The time width of one data
The modulation waveform is generated using Hall signals. The modulation waveform is then compared
The time (electrical degrees: 60°) from the rising (or falling) edges of the three Hall signals to the next
In the above diagram, the modulation waveform (1)’ data moves forward by the 1/32 time width of the
If the next edge does not occur after the 32 data items end, the next 32 data items move forward by the
The modulation wave is brought into phase with every zero-cross point of the Hall signal.
The modulation wave is reset in synchronization with the rising and falling edges of the Hall signal at
S
V
HU
HV
HW
S
S
Sw
U
V
* t = t(1) × 1/32
*t
*t
1
⑤
2
3
4
⑥
5
6
32 data items
⑥’
①
(1)’
①’
②
15
②’
③
30
31
32
③’
*HU, HV, HW: Hall signals
TB6556FG
2009-02-10