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
文件頁數(shù): 4/11頁
文件大?。?/td> 83K
代理商: P82CF201BDH
Philips Semiconductors
Product data
P82CF201
Low power, low price dual fan manager
2002 Nov 18
4
su01718
R
refC
DRIVE
R
thermC
DRIVE
R
refC
R
ref
INTERNAL V
ref
COMPARATOR
R
thermC
R
therm
Figure 2.
Fan Drive
Depending on the value of the thermistor, the fans will be driven by
MOSFET with a PWM signal.
When the thermistor resistance is higher than 10 K
and
THRESHOLD is set to “0” , the fan will be turned off.
However when the thermistor resistance is higher than 10 K
and
THRESHOLD is set to “0” , the fan will be driven by a 30% duty
cycle.
When the thermistor resistance is 10 K
, the fan will be driven by a
30% duty cycle PWM signal.
When the thermistor resistance is 1.7 K
, the fan will be driven by a
95% duty cycle PWM signal.
Any value in between is linear.
A Hysteresis with 30% PWM duty cycle (when THRESHOLD = 0) is
introduced to maintain constant cooling when the thermistor cools
from 10K (approx. 25
°
C) to down 15K (approx. 20
°
C). This reduces
on/off cycling for small temperature fluctuation.
When THRESHOLD is not connected or tied to “1”, the fans will
have a 30% PWM duty cycle to maintain constant cooling whenever
power is applied.
In most application, the V
GS
(Gate-Source Turn-on voltage) of the
MOSFET is lower than the V
OH
(V
DD
-0.7) of the fan drive pins.
When the V
GS
of MOSFET is higher than V
OH
, a non-inverting
amplifier (for N-type MOSFet) is needed. For easy reference, this
circuit is shown in Figure 5.
su01719
30%
95%
98%
PWM
R
therm
1.7K
10K
15K
HYSTERESIS
(THRESHOLD = 0)
Figure 3.
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