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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： | 9/30页 |
| 文件大小： | 836K |
| 代理商： | TDA21801 |
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FanControl
Page 17 of 30
DS-FanControl-TDA21801
6.5 Speed Value Generation parameters
This block generates the lower threshold for the oscillator: increasing the lower threshold the frequency
of the VCO is increased as well. This threshold is given by the highest value of the NTC amplifier
output, FCin amplifier output and VSPn min and it is limited to VSPn max. For VDD=12V and typical values
following limits are valid:
VFCin < 2.9% VDD: fan stops if the voltage at NTC is higher than 9% of VDD. If the voltage of the NTC
decreases below 9% of VDD, the speed of the VCO is controlled by the voltage at the NTC pin. When
the NTC increase back (in case of decreasing temperature) the VCO is controlled by the NTC up to
10% of VDD. If the ‘NTC’ input voltage is increased above 10% of VDD, the fan is turned off again.
2.9% VDD < VFCin < 7.5% VDD: fan speed is controlled only by NTC (If the pin FCin is open, the open pin
voltage is VFC open = 5.4% VDD typical)
7.5% VDD < VFCin: VCO and fan speed are controlled by the highest between NTC amplified output or
FCin amplified output.
VFCin > 23% VDD: VCO oscillator is forced to work at max speed
Fig. 6 FAN speed vs. NTC pin voltage (FCin < 2.9% of VDD)
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