參數(shù)資料
型號(hào)： TDA21801
廠商： INFINEON TECHNOLOGIES AG
元件分類： 運(yùn)動(dòng)控制電子
英文描述： AC MOTOR CONTROLLER, PDSO8
封裝： GREEN, PLASTIC, DSO-8
文件頁(yè)數(shù)： 3/30頁(yè)
文件大小： 836K
代理商： TDA21801
FanControl
Page 11 of 30
DS-FanControl-TDA21801
6 Application Information
6.1 Filter and Amplifier parameters
The Fan current is measured by a shunt resistor RRSin and connected to the RSin pin. This is the input
signal to the pre-amplifier with a typical gain of 15 and a typical cut off frequency of 20k Hz and –6 dB/
octave.
Only an input signal between 40mV and 330mV will be properly detected and processed otherwise the
recognition of the pulse cannot be guaranteed.
The value of the shunt resistor RRSin has to be chosen according to the current of the fan. For example
with spike current of 400mA a shunt resistor of typically 0.68 should be used.
At typical operating condition.
Values
Parameter
Symbol
Conditions
Min. Typ. Max.
UNIT
Gain
GRSin
Verified by Design
14.7
15
15.3
Cutoff frequency
FFA
Verified by Design
20
kHz
RSin pin source current
IRsin
VRSin= 100m V
0
4
uA
Fig. 3 Analog front end Block Diagram
VRSin
R
14R
R
14R
Rf
VREF
VOUT
C
D
VOUT‘
R3
R1
R2
Ib
I2
I1
+
_
+
_
V-
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