TB6572AFG*** Toshiba, TB6572AFG*** Datasheet - Page 19

• 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

Integral amp output
(speed command)
17. V
V
READY output
CC
< V
V
Drive mode
The TB6572AFG contains a circuit to avoid the V
This is accomplished by switching the drive mode from synchronous rectification to high-side PWM.
(1)
(2)
When the drive mode has changed to high-side PWM, the current waveform may be distorted. When the
drive mode returns to synchronous rectification, sine-wave driving is used with 180° energization.
Normally, V
(min).
This feature does not guarantee that any V
cause in the power supply circuit, a separate V
CC
= 28.5 V
CC
CC
= 24 V
START
(typ.)
Switching from synchronous rectification to high-side PWM
The TB6572AFG continually monitors the V
changes to high-side PWM.
Switching from high-side PWM to synchronous rectification
When the integral amp output levels off for a constant motor speed (with the READY output being
Low), the drive mode changes to synchronous rectification.
Bounce Prevention
Bounce Prevention Mode (normal) >
CC
Deceleration mode
(max) should be kept below the minimum V
LOW
Constant speed
Sync. rectification
V
CC
bounce
High-side PWM
CC
bounce will be avoided. In cases where V
CC
19
CC
CC
bounce filter should be added.
bounce caused by abrupt acceleration or deceleration.
voltage. If Vcc rises above 28.5 V (typ.), the drive mode
CC
bounce prevention threshold of 27.6 V, V
Sync. rectification
Constant speed
CC
TB6572AFG
bounces due to a
2008-1-21
K