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TPIC2101 Datasheet(PDF) 4 Page - Texas Instruments |
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TPIC2101 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 21 page TPIC2101 DC BRUSH MOTOR CONTROLLER SLIS060 – OCTOBER 1995 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 detailed description The TPIC2101 is an integrated circuit that generates a fixed frequency, variable duty cycle PWM signal to control the rotor speed of a permanent-magnet dc motor. This section provides a functional description of the device. dual command speed input capability The TPIC2101 is user configurable to either auto or manual mode, and can sense either configuration internal to the IC. In automatic mode, the speed-command-signal is an open-collector PWM signal on the AUTO terminal, and the MAN terminal is floating. In manual mode, the speed-command-signal is a variable resistance across the AUTO and MAN terminals with the MAN terminal connected to Vbat. sleep, run, and fault states The TPIC2101 operates in a sleep state, a run state, or a fault state. In the auto mode, a zero-speed input initiates the sleep state. In the manual mode, an open-circuit at the AUTO and MAN terminals initiates the sleep state. The device will also be in the sleep state during fault conditions. In the sleep state, the gate drive terminal (GD) is held low and the overall current draw is less than 200 µA. Any speed command initiates the run state, which is the normal operating state of the device. The fault state is entered only when the device detects an overvoltage or current fault. Fault state is exited either by removal of the overvoltage condition (exiting to run state) or by resetting a current fault by entering the sleep state. speed command adjustment The device adjusts the GD terminal PWM signal with changes in Vbat to keep the effective motor voltage constant. The effective motor voltage is defined to be the product of the GD terminal PWM rate and the voltage of Vbat. Figure 1 shows motor voltage as a function of input speed command in the automatic mode for various battery voltages. PWMin is described as the duty cycle of the PWM signal at the AUTO terminal. 8 6 2 0 020 40 60 10 14 16 80 100 4 12 Vbat = 12 Vbat = 8 Vbat = 16 PWMin– Incoming Pulse Width Modulation – % Figure 1. Motor Voltage vs. Incoming PWM for Various Battery Voltages over/under voltage protection The IC enters the fault state if Vbat rises above over-voltage shutdown (VOV typically equals 18.5 V). If Vbat falls below the under-voltage shutdown (VUV typically equals 7.5 volts) the IC enters sleep state. Hysteresis assures that the device will not toggle into and out of sleep state or fault condition. |
Similar Part No. - TPIC2101_12 |
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Similar Description - TPIC2101_12 |
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