tb6585fg TOSHIBA Semiconductor CORPORATION, tb6585fg Datasheet - Page 11

• Manufacturer Part Number: tb6585fg
• Description: 3-phase Sine-wave Pwm Driver For Bldc Motors
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5. Position Detection
6. Rotation Pulse Output
7. Reverse Rotation Detection
<Simplified Diagram of the Automatic-Lead-Angle Correction Circuitry>
*: Gain = (R
The in-phase input voltage range, V
*: The Hall amplifier can operate when V
This pin generates a rotation pulse (3 pulses/electrical degree).
Example: With an eight-pole motor, 12 pulses are generated per revolution. (12 ppr)
The direction of the motor rotation is detected. The drive mode is then selected between 120° commutation
and 180° commutation modes.
The detection is performed at every electrical degree of 360°.
Note: When the Hall signal frequency is below 2.5 Hz, the TB6585FG is put in 120° commutation mode even
Motor current
zero-cross points of each phase signal, that is, the 60-electrical-degree interval, the amplitude should be as
high as possible. (VS is recommended to be 200 mVpp or higher.)
CW/CCW Pin
High (CCW)
Low (CW)
when 180° commutation mode is selected.
1
HUM
V [v]
+ R
2
) /R
Actual Rotation Direction of the Motor
1
, R
V
V
(Hall effect input)
RF
RF
CCW (counterclockwise)
CCW (counterclockwise)
3
= 100 kΩ, C
V
(FG output)
CW (clockwise)
CW (clockwise)
S
Amp
≥ 50 mV
R
2
V
.
S
CMRH,
1
Gain × V
S
= 0.1 μF
Gain × V
is at least 50mVpp. However, to stabilize the time interval between
V
is from 1.5 to 3.5 V. The input hysteresis, V
H
RF
11
RF
Peak
hold
V
H
V
H
Commutation Mode
180° commutation
120° commutation
120° commutation
180° commutation
= 8 mV (typ.)
IV pin
Gain × V
Gain × V
(peak)
(peak)
RF
LA pin
RF
HUP
Lead-
angle
value
T [s]
Lead-angle value
A/D converter
5-bit
H, is
TB6585FG
8 mV (typ.).
2008-03-04