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參數(shù)資料
| 型號(hào)： | AN3861SA |
| 廠商： | PANASONIC CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Sensor-less Motor Drive IC for VTR Movie Cylinder |
| 中文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1 A, PDSO32 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-32 |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大?。?/td> | 103K |
| 代理商： | AN3861SA |
VSL =
Ich
6 f
emf
×
CSL
VSL
GND
Fig.5 Waveform of SL1, SL2 and SL3
(5) FC terminal
This is an oscillation terminal which determines the commutation frequency at operation start and the frequency f
emf
of induc-
tive voltage for switching over the charging/discharging current of the SL terminal (Refer to (6) below). Normally, f
FC
=16.3kHz
when CFC=560pF and the frequency at operation start is approx. 4Hz.
(6) SL1, SL2, SL3 terminal
The SL1, SL2 and SL3 are terminals producing the slope waveform for synthesizing the trapezoidal wave current. Since the
slope waveform is synthesized by charging/discharging the external capacitor with the constant current, the amplitude VSL
becomes as follows :
Where, Ich : Charging/Discharging current
CSL : Capacitance value
f
emf
: Frequency of motor inductive voltage
The value of Ich is changed according to the relationship between the frequency of the motor inductive voltage and the oscilla-
tion frequency of the FC terminal, as shown in Fig.6 in the next page. Therefore, the capacitance value of external capacitor CSL
should be selected so that the value of VSL could fall in the range from 0.5 to 1.5V during constant rotation.
Since the relative dispersion of three external capacitors may cause increase of motor noise, the capacitor with high accuracy
should be used.
(7) Capacitance value of Uin, Vin, Win
The capacitor of Uin, Vin and Win prevents the malfunction of the comparator due to spike-shaped voltage which is generated
in the motor coil at operation start. For this reason, it should be used as necessary for large motor of large L such as winding coil.
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