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參數資料
| 型號： | E-L8150TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO28 |
| 封裝： | LEAD FREE, SOP-28 |
| 文件頁數： | 16/37頁 |
| 文件大?。?/td> | 753K |
| 代理商： | E-L8150TR |
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Obsolete
Product(s)
- Obsolete
Product(s)
L8150
Operating description
5.3
Speed Control Circuitry
The rotation speed control signal (VSP) is an external signal, whose range is 2.1V
÷5.4V.
This signal is amplified by an inverting amplifier which takes as reference a voltage derived
from VREG through a voltage divider.
The amplifier output is the input signal of an 8-bit ADC which generates the digital word
KVAL, used to determine the duty cycle value according to the following Figure 13:
Speed control:
Intout 0-0.7V: duty =100% for smooth drive
(max duty is limited at about 95% for rectangular as shown in the following figure)
Intout 0.7-3.7V: duty control 100-0%
Intout 3.7-4.5: duty = 0 %
Intout 4.5V - 5V (VREG): all power off (all 6 output = GND)
(Each Vth depends linearly on VREG, being obtained by means of voltage dividers).
Figure 13.
Duty cycle
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