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参数资料
| 型号： | LB8502M |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 0.003 A, PDSO10 |
| 封装： | 0.225 INCH, MFP-10 |
| 文件页数： | 9/11页 |
| 文件大小： | 94K |
| 代理商： | LB8502M |
LB8502M
No.8337-7/11
Pin Setting Procedures (Provided for reference purposes)
1. RC pin
The one-shot multivibrator pulse width can be calculated with the following equation.
TRC(s)
≈ 0.85 × R × C..................................................... Equation 1
If the FG signal frequency at full motor speed is fFG (Hz) and the control duty desired for full speed is DUTY (for
example: 50%
→ 0.5), the values of the resistor and capacitor connected to the RC pin can be determined from the
following equation.
R × C = DUTY/(3
× 0.85 × fFG) ..................................... Equation 2
Note that if "rpm" is the full motor speed, since one revolution will be two FG periods, the following equation gives the
FG frequency, fFG (Hz).
fFG(Hz) = 2rpm/60 ......................................................... Equation 3
For reference purposes, the following table lists the RC pin external component values determined from equations 2
and 3 when the control duty at full speed will be 80% for a variety of full motor speed values.
Note that the capacitor value must be in the range 0.01F to 0.015F due to the RC pin discharge capacity of the IC.
Full motor speed
R
× C
R
C
10000rpm
0.94
× 10-3
63k
0.015
F
8000rpm
1.18
× 10-3
78k
0.015
F
6000rpm
1.57
× 10-3
105k
0.015
F
4000rpm
2.39
× 10-3
157k
0.015
F
2000rpm
4.68
× 10-3
312k
0.015
F
The table below lists the RC pin external component values when the control duty for full motor speed is changed for a
full motor speed of 10,000rpm.
Duty at full speed
R
× C
R
C
80% (= 0.8)
0.94
× 10-3
94k
0.01
F
60% (= 0.6)
0.71
× 10-3
71k
0.01
F
40% (= 0.4)
0.47
× 10-3
47k
0.01
F
Also, note that the FG frequency can be determined from the following equation for various control duty input states.
fFG = DUTY/(3
× 0.85 × RC).......................................... Equation 4
2. C Pin
Since a capacitor that can smooth the pin voltage is connected to the C pin, if the CTL pin input signal frequency is f
(Hz), then the capacitor must meet the following condition. (Here, R is the IC internal resistance of 180k
(typical).)
1/f = t < RC
Note that the larger the capacitor, the longer the soft start time will be and its response to changes in the input signal will
be slower.
VREF circuit
CTL circuit
CTL pin
A capacitor that can smooth the pin voltage is connected
here.
1/f = t < CR
C pin
180k
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相关代理商/技术参数 |
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