HV7100

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifi cations is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The HV7100 is an integrated PWM speed controller for driving 24V and 48V DC Fans. The features and benefi ts provided by make driving fans simple and low cost. It drives a high side external P-channel FET, allowing the use of fans having a ground-based tachometer signal. It has a wide input voltage range of +16V to +90V, ideal for +24V or +48V systems. No low voltage supply is needed.

A 4-bit digital control input of HV7100 provides direct interfacing with a microcontroller or system processor to control the fan speed. It can also be used as a stand-alone fan controller, via a thermistor connection to the Linear Control pin.

The HV7100 has a wide PWM frequency range. When driving fans directly with a PWM supply voltage, frequency may be set low, around 50Hz - 120Hz. When used to drive fans requiring a DC supply, an LC fi lter may be employed. In this case, PWM frequency may be as high as 100kHz, reducing component sizes in the fi lter.

The HV7100 is an ideal device to incorporate in fan trays and fan control modules, as it reduces circuit complexity and minimizes parts count and overall cost for thermal management.