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參數(shù)資料
| 型號： | KA3903 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Power Window Motor Control IC |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, 0.4 A, PDIP16 |
| 封裝： | 0.300 INCH, DIP-16 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 286K |
| 代理商： | KA3903 |
FAN8903(KA3903)
8
Over Current Protection
Simple Applications
The voltage (Vrs) proportional to the motor current is generated across the resistor (R
S
). If the Vrs exceeds the reference volt-
age (Vref), over current part-time integration carried out through R3, C2 and OP-amp.
When the amount of over current integration is lager than S2, the over current signal issued.
The cancel time (T
C
) between motor stall and motor switch-off is determined by following equations;
You can adjust both the value of the sensing resistor (R
S
) according to motor type and the cancel time by changing R3 and
C2. Additionally the over current detection of the FAN8903 is immune to any sudden peak current or a current slightly lager
than the reference current.
Temperature Compensation Applications
Generally speaking, the less ambient temperature, the more motor current. In the previous applications, there are some diffi-
culties to decide the reference current level.
In case of low ambient temperature, the difference between the operating motor current and the reference current is very small.
When the reference current level is high, the margin is large. But at a high ambient temperature, the difference between the
motor current and the stall current is small.
Moreover, the stall current at depends on a battery voltage. It is hard to decide what the optimal reference level is.
In the following figure, in the room temperature, the inverting voltage (V2) and the reference current are calculated as follows;
V2
Vcom
R3
Rntc
Rt
R3
+
+
(
)
×
=
Vcom
Vref
V2
–
=
The resistance of the NTC decreases according to rising of the ambient temperature. So the reference level, Vcom is changed
with the temperature change as shown in the following figure.
To ensure precision of the reference level, Rt can be adjusted.
T
C
C2
dV
×
(
)
I
C
=
where I
C
Vrs
Vref
–
(
)
R3
=
,
dV
Vouth
0.8
–
=
+
FAN8903
OP-amp
Vref
OCP
0.8V
C2
474
R3
47k
RS
20m
Vrs
MOTOR
+
6
7
Vro
OCP
Vro
Vref
S1
S2
Vrs
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