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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： | 7/30页 |
| 文件大小： | 836K |
| 代理商： | TDA21801 |
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FanControl
Page 15 of 30
DS-FanControl-TDA21801
6.3 Digital Control parameters
6.3.1 Function of the speed loop
The VCO sets the length of the FanM pulse (TFanM = 16*Tvco). The length of this pulse is fixed for fixed
VCO frequency. The speed loop tries to keep the FanM duty cycle of 12.5% stable. For fixed VCO
frequency this means that the fan speed is stable. If the VCO frequency is increased, the FanM pulse
length TFanM is decreased, so with the previous fan speed the duty cycle is lower than 12.5%.
The speed loop then increases the fan speed to achieve 12.5% duty cycle. This happens by reducing
TRSOUT.
If the duty cycle is too high, this means the FanM frequency and fan speed is too high, the TRSOUT
output is increasing (voltage across fan is decreasing).
If the duty cycle is too low, this means the FanM frequency and fan speed is too low, the TRSOUT
output is decreasing (voltage across fan is increasing). At power-on and every time the fan is turned on
starting from not rotating condition the applied voltage on TRSOUT is 6.8V referenced to VDD.
6.4 Power Output Stage parameters
The output of the DAC is amplified to the output TRSOUT.
The power output stage is connected with an external transistor to control the fan. There is an
intentional internal coupling of fast VDD supply voltage variations to the output TRSOUT to keep the
voltage across the fan stable. The ratio between supply variations and voltage variations across VDD-
TRSOUT is expressed as PSRR in the table below.
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