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參數資料
| 型號： | FAN8902 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | DC FAN Motor Controller(風扇直流電機控制器) |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, 0.8 A, PDIP14 |
| 封裝： | 0.300 INCH, DIP-14 |
| 文件頁數： | 8/14頁 |
| 文件大小： | 140K |
| 代理商： | FAN8902 |
FAN8902(KA3902)
8
6. MOTOR STALL CURRENT LIMITATION
In the steady state, the terminal voltage on a motor is consisted of a back EMF and the voltage drop on the armarture resistors.
When the motor happens to be stalled, the back EMF becomes zero, and the motor current (I
M
) is quickly increased until a
maximum values.
Therefore the duty of the pin #12 output becomes lower because of the increase of the sense voltage (V
RS
). Also it makes the
voltage (V
La
) be lowered, then it makes the duty become lower again.
This mechanism makes the motor current hold very low value in the stalled motor state.
The voltage on pin #14 (V
La
) ia calculated as follows:
We can choose the ratio of the resistors, R2 and R3, as follows:
- Applied the rated voltage on motor, and then measured the current IRAT
- Matched the maximum command current, V
CMD,MAX
to I
RAT
.
V
CMD,MAX
= V
La,MAX
= R
S
×
I
RAT
×
5
×
5
for example, if R
S
= 10m
and I
RAT
= 20[A] at V
BAT
= 13[V],
V
CMD,MAX
= V
La,MAX
= 10m
×
20
×
25 = 5V
- V
La,MAX
= 5V = V
BAT
×
1
×
R3 / (R2 + R3)
Ratio = R3 / (R2 + R3) = V
CMD,MAX
/ V
BAT
= 5 / 13
Therefore, R2 : R3 = 8 : 5
+
+
+
×
5
1
14
10
12
M
VBAT
C1
C2
Q1
D1
IM
Q2
V
RS
R
S
R5
4R
R
V
CMD
R3
C4
R2
V
GS
R10
I*
Logic
PWM
COMP
Buffer-OP-amp
V
CS
V
LA
FAN8902
CMD
+
V
La
V
BAT
D
×
+
R2
R3
---------------------
×
=
Assumed the saturation voltage of Q1 is zero.
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