tb6551f TOSHIBA Semiconductor CORPORATION, tb6551f Datasheet - Page 15

• Manufacturer Part Number: tb6551f
• Description: 3-phase Full-wave Sine-wave Pwm Brushless Motor Controller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Operating Waveform When Driven by Sine-Wave PWM
Generation inside of IC
Output waveform
Inter-line voltage
Note: At startup, the motor is driven by a sine wave when the Hall signals are 5 Hz or higher (f
When the motor is driven by a sine wave, the motor is accelerated/decelerated according to the On duty of
T
duty on page 11).
Phase W
Phase U
Phase V
ONU
motor is rotating in the same direction as the TB6551F controls it (REV = Low).
(V-W)
(W-U)
V
(U-V)
V
V
WU
VW
UV
W
U
when the amplitude of the modulation symbol changes by voltage V
X
V
Y
Z
Triangular wave frequency = carrier frequency = f
Modulation signal
15
osc
/252 (Hz)
(CW/CCW = = = = Low, OS = = = = High)
Triangular wave (carrier frequency)
e
(see the diagram of output On
osc
= 4 MHz) and the
2002-12-24
TB6551F