HV7100_13 Datasheet, PDF (1/8 Pages) Supertex, Inc – 24/48V Fan Driver/Controller With High-Side Drive

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 and fan
control modules, as it reduces circuit complexity and minimizes
parts count and overall cost for thermal management.
Typical Application Circuit
V_PP
Host
Controller
speed control
enable
VPP1 VPP2
VGATE
DIN0 - DIN3
HV7100
EN
LIN
CT
RT
VDD
OUT
GND
Optional LC filter for
providing a DC fan drive
Doc.# DSFP-HV7100
B072413
tach signals
Supertex inc.
www.supertex.com