Datenblatt-Suchmaschine für elektronische Bauteile |
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TPIC2101 Datenblatt(PDF) 5 Page - Texas Instruments |
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TPIC2101 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 21 page TPIC2101 DC BRUSH MOTOR CONTROLLER SLIS060 – OCTOBER 1995 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 current limit protection Current through the motor is limited by lowering the GD terminal PWM when a high current situation occurs. If the condition persists, the device shuts off the gate drive (GD terminal) until the circuit is reset externally by entering the sleep state. theory of operation This section explains the normal circuit operation for the automatic and manual states. power supply and oscillator Positive voltage is supplied to the integrated circuit on the Vbat terminal, ground is the GND terminal. The IC steps down the Vbat supply to the regulated 5.5 V supply at the V5P5 terminal. AREF is shorted to V5P5 in run state and disconnected when the IC is in sleep state. Two terminal connections (COSC and ROSC) are provided to control an internal oscillator. The oscillator freq, f(osc), is defined by the following equation: f (osc) + 2 ROSC COSC Nominal oscillator frequency is 20-kHz based on the recommended components. automatic mode signal decoding In automatic state, a high-to-low signal transition on the AUTO terminal (open collector) will wake the device from the sleep state into the run state. The speed command information is contained in the duty cycle of a 100 Hz PWM signal on the same terminal. The speed information is inverted, i.e. a signal that is 10% high commands a faster speed than a 20% high signal. In automatic mode the MAN terminal is floating. The device is capable of rejecting ± 2 V of ground offset VIO between the open-collector switching transistor and the GND terminal without affecting the output duty cycle. Two terminals are provided for an RC integrator (SPEED and INT) to average the incoming PWM signal for use as a PWM comparator input. Figure 2 illustrates the automatic state connections. 2 3 499 Ω 499 Ω No Connection I = 100 µA VIO 20 k Ω min 27.4 k Ω 14 2.75 V 4 7 4.7 µF MAN AUTO CCS SPEED INT TPIC2101 Figure 2. Automatic Mode Connections |
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