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TPIC2101 데이터시트(PDF) 5 Page - Texas Instruments

부품명 TPIC2101
상세설명  DC BRUSH MOTOR CONTROLLER
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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
499
No Connection
I = 100
µA
VIO
20 k
Ω min
27.4 k
14 2.75 V
4
7
4.7
µF
MAN
AUTO
CCS
SPEED
INT
TPIC2101
Figure 2. Automatic Mode Connections


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