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
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.
Supertex
