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TPIC2101D Folha de dados(PDF) 6 Page - Texas Instruments |
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TPIC2101D Folha de dados(HTML) 6 Page - Texas Instruments |
6 / 18 page TPIC2101 DC BRUSH MOTOR CONTROLLER SLIS060 – OCTOBER 1995 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 automatic mode signal decoding (continued) The device enters the sleep state if the PWM signal on the AUTO terminal is absent (the AUTO terminal remains high or low) for 2048 clock cycles of the 20 KHz oscillator. An internal 1 mA pull-up resistor is provided for the AUTO terminal when in the auto mode. This pull-up resistor is not present in the manual mode or during sleep state. The device adjusts the output PWM duty cycle to keep the effective motor voltage constant with changing battery voltages (Vbat) as per the equation: PWMout + (2.88 ) 13.12(1 * Input Duty Cycle)) V bat 100% Figure 3 illustrates this transfer curve with various battery voltages. 50 40 20 10 0 90 30 0 10 20 304050 60 70 60 80 100 70 80 90 100 Vbat = 8 Vbat = 12 Vbat = 16 PWMin – Incoming Pulse Width Modulation – % Figure 3. Output PWM vs. Incoming PWM for Various Battery Voltages The allowable automatic mode PWMout variation is ± 7% over all operating conditions as indicated in the AC characteristics Table. manual mode speed signal decoding In manual mode, a high input (>5.5V) on the MAN terminal changes the state of the device from sleep to run. While in the run state the device senses the resistance between the MAN and AUTO terminals by turning on a 2 mA current sink to each terminal. The MAN and AUTO current sinks are multiplied 20 X from the CCS current. This 2 mA current sink creates a 1 V drop across each 0.5 k Ω resistor and a 0 to 2.2 V differential across the 0 to 1 k Ω potentiometer (and thus across the 2 terminals). The SPEED and INT terminals should be utilized as in the proceeding section as a low-pass filter. When the connection to the MAN terminal is opened, the device enters the sleep state. In addition, the device is capable of rejecting up to 2.2 V of source voltage offset (VIO), as indicated in Figure 4. |
Nº de peça semelhante - TPIC2101D |
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Descrição semelhante - TPIC2101D |
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