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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L8150 датащи(PDF) 23 Page - STMicroelectronics |
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L8150 датащи(HTML) 23 Page - STMicroelectronics |
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23 / 37 page  L8150 Operating description 23/37 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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