HV7100

Supertex inc. HV7100 24/48V Fan Driver/Controller With High-Side Drive Features ►► High-side drive allows use of tachs ►► Direct interface to host controller ►► Noise-immune linear speed control ►► 4-bit digital speed control ►► Operates from single +24/+48V supply ►► Programmable PWM frequency ►► Undervoltage lockout Applications ►► 24/48V chassis cooling tray ►► Servers ►► SAN equipment ►► Cellular and fix wireless systems ►► 24/48V PBX system ►► Base stations General Description The HV7100 is an integrated PWM speed controller for driving 24 and 48VDC fans. The features and benefits provided by the HV7100 make driving fans simple and low cost. The HV7100 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 +16 to +90V, ideal for +24 or +48V systems. No low voltage supply is needed. A 4-bit digital control input provides direct interfacing with a micro controller 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 50 - 120Hz. When used to drive fans requiring a DC supply, an LC filter may be employed. In this case, PWM frequency may be as high as 100kHz, reducing component sizes in the filter. The HV7100 is an ideal device to incorporate in fan trays...