BD3575HFP-TR

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BD3575HFP-TR Application Field and Working Principle

BD3575HFP-TR is a low noise, high efficiency three-channel, fan motor drive IC designed for fan control applications. It belongs to the family of voltage regulators, specifically the linear family. This device is used to drive brushless DC motors in fans used in desktop computer and mobile terminals.

Applications

The BD3575HFP-TR can be used in the following applications:

• Fan control in desktop computers.
• High-speed fan control in mobile terminals.
• Low operating noise.
• High efficiency motor control.

Working Principle

The BD3575HFP-TR works by controlling the voltage applied to the fan motor and regulating it to the desired speed. It achieves this by using an on-chip power MOSFET bridge to convert the input voltage supplied by the system into a regulated fan voltage, which is capable of producing up to a maximum of 35V, depending on the input voltage. This voltage is then adjusted to the desired speed with the help of two internal channel controls, one for the low speed settings and one for the medium speed settings.

The low speed control works by controlling the switching time of the power MOSFET bridge. This is achieved by modulating the frequency of the PWM signal, which is generated internally by the IC. The medium speed settings can be adjusted manually with the help of the external potentiometer. The BD3575HFP-TR also includes a variety of safety features, such as over voltage protection, thermal protection, and motor protection.

The fan speed control is also achieved by the use of a dedicated analog-to-digital converter (ADC) and dual 6-bit resolution digital-to-analog converters (DACs). The ADC allows the controller to measure and monitor the fan\'s speed, while the DACs are used to adjust the fan\'s rpms. This makes it easier for the fan to respond quickly and precisely to the required changes in speed. The on-chip ADC also provides for temperature monitoring, which is useful for temperature control.

Conclusion

The BD3575HFP-TR is a low noise, high efficiency three-channel, fan motor drive IC that is used for fan control in desktop computers and mobile terminals. It works by controlling the voltage applied to the fan motor and regulating it to the desired speed. The device uses an on-chip power MOSFET bridge to convert the input voltage to a regulated fan voltage, and the speed is then adjusted by two internal channels and an external potentiometer. The BD3575HFP-TR also includes a variety of safety features and uses an ADC and two DACs for fan speed control.

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