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| 型号： | TA8490F |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.2 A, PDSO30 |
| 封装： | 0.375 INCH, 1 MM PITCH, PLASTIC, SSOP-30 |
| 文件页数： | 5/22页 |
| 文件大小： | 593K |
| 代理商： | TA8490F |
TA8490F
2001-06-13
13
Triangular wave oscillator circuit
Triangular waves are generated by connecting a capacitor between the OSC pin and GND. The charging /
discharging currents are ±50 A, and the oscillation frequency is as
[Hz]
(pF)
C
2
A)
(
100
OSC
f
×
=
Taking into account efficiency considerations and the effects of noise, Toshiba recommends using the IC with an
oscillation frequency of more or less 100kHz.
VM output voltage (3phase maximum) detection circuit
This circuit selects the highest voltage from the three phases of output voltages and then outputs the voltage
difference between the selected voltage and VM as a voltage referenced to GND (VCE for the upper output stage).
This voltage is filtered by a capacitor at the CP pin and compared with the triangular wave before being output
on the SWC pin.
When using a switching regulator, the driver IC operates in a closed loop with a VCE of 0.3V (typ.) for the upper
output stage.
Switching regulator control signal output circuit
This circuit outputs the result of comparison between VCE for the upper stage and the triangular wave from one
of the opencollector output terminals. By controlling an external PNP transistor in this way, the circuit
controls VM.
The output function is as follows :
Thermal shut down circuit
This circuit turns off output when Tj = 175°C(typ.) (according to design specification).
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