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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： | 11/30页 |
| 文件大小： | 836K |
| 代理商： | TDA21801 |
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FanControl
Page 19 of 30
DS-FanControl-TDA21801
6.6 NTC input
The analog input for NTC divider gives speed information to the VCO (as indicated before) and detects
two over temperature conditions for RC-VCO output and FanM output and TRSOUT output:
a)
OTP-early-warning condition
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 signal to the PC-system that the power
supply is becoming too hot and soon might be switched off.
Normally the FanM signal has a duty cycle of 12.5% or lower. In the case of OTP-early-warning
condition this duty cycle will switch to 87.5% or higher. This can be easily detected by the PC-system.
b)
OTP-psu-shut-down condition
This condition is detected, if the NTC input goes below VNTC_OT (with a certain hysteresis VHyst_OT).
In this case actions will be started to shut down the Power supply via the RC-VCO pin, also to switch
FanM to High-level and TRSOUT to Low-level.
OTP and Early warning output are filtered and delayed before they become active.
6.6.1 Electrical Characteristic - NTC
At typical operating condition.
Values
Parameter
Symbol
Conditions
Min. Typ. Max.
UNIT
Input voltage range
VNTC
0
VDD
V
Fan Off NTC voltage
VNTC_FanOff
Rising
9.8
10
10.2
Fan On NTC voltage
VNTC_FanOff
Falling
8.8
9
9.2
Early warning
temperature detection
level.
VNTC_EW
Voltage falling
4.685 4.785 4.885
Early warning
temperature detection
hysteresis.
VHyst_EW
To be added to the VNTC_EW
0.19
0.25
0.29
Overtemperature
detection level -
VNTC_OT
Voltage falling
4.075 4.175 4.275
Overtemperature
detection hysteresis
VHyst_OT
To be added to the VNTC_OT
0.19
0.25
0.29
% of
VDD
Voltage gain
GNTC
without external resistor - VbD
-5.2
-5
-4.8
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