參數(shù)資料
型號(hào)： TPIC2101D
廠商： TEXAS INSTRUMENTS INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSH DC MOTOR CONTROLLER, 0.05 A, PDSO14
封裝： SOIC-14
文件頁(yè)數(shù)： 18/21頁(yè)
文件大小： 381K
代理商： TPIC2101D
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
–
Output
PWM
–
%
70
60
80
100
70
80
90
100
Vbat = 8
Vbat = 12
Vbat = 16
PWM
out
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
resistor and a 0 to 2.2 V differential across the
0 to 1 k
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.
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