TB6572AFG*** Toshiba, TB6572AFG*** Datasheet - Page 13

• 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

8.2
Control Amplifier
•
•
•
The voltage integrated in the charge pump is input to the control amplifier.
The input is placed in high-impedance state because it is a P-ch gate.
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for
explanatory purposes.
The control amplifier circuit has an offset of 0.45 V (typ.). If the INTEG-out pin voltage exceeds
the offset value, the energization signal outputs become active. It incorporates a clamp circuit
that saturates the PWM duty ratio for the energization signal outputs when the INTEG-out pin
voltage becomes 2.85 V (typ.).
The PWM duty ratio indicates the value at the peak of the modulation waveform. A duty ratio of
100% indicates that the peak value coincides with the peak of the triangular wave.
INTEG-out
Triangular wave
100
(PWM duty ratio: 100%)
0.5
V
ref1
V (INTEG-out) (V)
2.85
13
V
ref1
Modulation waveform
TB6572AFG
2008-1-21