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TPIC2101N Fiches technique(PDF) 4 Page - Texas Instruments

No de pièce TPIC2101N
Description  DC BRUSH MOTOR CONTROLLER
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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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.


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