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參數(shù)資料
| 型號(hào)： | P82CF201BDH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low power, low price dual fan manager |
| 中文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, MO-153, SOT-360-1, TSSOP-20 |
| 文件頁(yè)數(shù)： | 5/11頁(yè) |
| 文件大?。?/td> | 83K |
| 代理商： | P82CF201BDH |
Philips Semiconductors
Product data
P82CF201
Low power, low price dual fan manager
2002 Nov 18
5
Motor Failure Detection and fault Reporting
(including watchdog reset)
As shown in Figure 4, the V
SENSE
input is connected to the collector
of NPN transistor through an inverting buffer transistor (2N3904 or
PMBT3904D) which amplifies the signal from the low-value current
sensing resistor in the ground return leg of the fan circuit. During
normal fan operation, communication occurs as each pole of the fan
is energized.
The fan current develops across the sense resistor(R
SENSE
). This a
voltage follower of the PWM pin.
In a running motor, a current will flow through the resistor R
SENSE
resulting in a voltage drop. The commutation will cause a narrow
window where there is no current flow. Motor detection is done by
the presence of commutation pulses. If there is constant voltage
level on the V
SENSE
pin when the motor is driven by a PWM signal,
the motor is jammed. When there is no voltage at all, the motor
might not be connected or the MOSFET is defective. The fault
condition also triggers the maximum PWM applied to the running
fan.
To detect the commutation pulses correctly, the V
SENSE
input needs
a logic high level of 0.2*V
DD
+0.9 V. (For example:
1.56 V@V
DD
=3.3 V). The design of proper sense circuitry is a
matter of scaling the R
SENSE
and the gain in buffer transistor to
meet the logic high as shown in Figure 4. Assuming the V
BE
(min) of
the transistor is approx. 0.5 V. Table 1 lists some recommended
R
SENSE
values according to the nominal operating current.
Table 1. Recommended values of R
SENSE
per
Figure 4
Nominal Fan Current(mA)
Min R
SENSE
(ohms)
5.1
100
200
2.5
450
2.2
800
1.0
In addition, when the thermistor resistance falls below 1.7 K
(for
NTC thermistor) indicating temperature above 76
°
C, the fault line
will be asserted.
When the fan fails continuously, the fault signal will be held on LOW.
su01720
FANXDRIVE
V
SENSE
x
3.3 V
12 V FAN
+12 V
Q1
SI4410DY
R
(2.2
TYPICAL)
+12 V
3.3 V
Figure 4. Interfacing the 82CF201 to a 2-Wire fan.
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