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参数资料
| 型号： | TDA21801 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 运动控制电子 |
| 英文描述： | AC MOTOR CONTROLLER, PDSO8 |
| 封装： | GREEN, PLASTIC, DSO-8 |
| 文件页数： | 18/30页 |
| 文件大小： | 836K |
| 代理商： | TDA21801 |
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FanControl
Page 25 of 30
DS-FanControl-TDA21801
6.8 FanM
The FanM is a digital output to show the fan speed. The output is an open drain MOSFET with internal
pull up and pull down to have same behavior like a 3.3V pull up of 10K.
If there is no OTP-condition detected by the analogue-speed-value block, the FanM signal with running
fan will have a duty cycle of 12.5% in steady state condition and if the fan is able to run at the loop
speed). If the fan is not able to run at the loop speed the duty cycle is lower than 12.5%.
The FanM signal is generated to give two pulses per revolution for a four poles fan. Each of the 2
pulses has the same time length of t = 16 / frequency of VCO
There are 2 exceptions:
a)
FanM output with OTP-early-warning condition at NTCin-pin:
This condition is detected, if the NTC input goes below VNTC_EW (with a certain hysteresis VHyst_EW ).
In this case the FanM-signal will be inverted to give a warning to the PC-system, that the power supply
is becoming too hot and soon might be switched off.
In this case the FanM duty cycle will switch to 87.5% or higher.
b)
FanM output with OTP-psu-shut-down condition at NTCin-pin:
FanM goes to continuous HIGH-position = open Drain MOSFET off. This is a way that an external
control system can detect that there is an OTP condition. This signal is a static signal, because the RC-
VCO pin will also be used as OTP output. This will stop the oscillator.
6.8.1 Electrical Characteristic – FanM Signal
At typical operating conditions
Values
Parameter
Symbol
Conditions
Min. Typ. Max.
Unit
Output voltage high
VFanM_H
Generated from VDD=12 V
26.5
26.8
27.1
%of
VDD
Output voltage low
VFanM_L
Isink =6m A
0.4
V
Output impedance
RFanM
6.6
10
12.8
k
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