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PDF HV7100 Data sheet ( Hoja de datos )
| Número de pieza | HV7100 | |
| Descripción | 24/48V Fan Driver/Controller | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV7100 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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
VPP
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
1 page  
HV7100
When using linear control mode, DIN0 – DIN3 should be set
to logic 0. If desired, DIN may be used to set a lower limit on
the fan speed. This input is immune to moderate noise on
the control signal.
Digital Control - Applying logic signals to the DIN0 – DIN3
pins sets the duty cycle of the output. 0000 = 0% and 1111
= 100%. See Table 1 for details. In digital control mode, LIN
should be set to 0V. DIN0 – DIN3 pins have internal pull
downs so that the DAC output will default to 0V when it is
not used.
External PWM - An external PWM signal can be applied
to the Enable pin to directly control the duty cycle. A logic 0
turns the transistor off, and a logic 1 turns it on. When using
this control method, connect DIN0 – DIN3, LIN, and RT to
VDD. Connect CT to GND.
The DAC output and the Linear Control signals are OR’d
together. Whichever has the higher value dominates. This
allows an analog temperature sensing circuit to override the
digital inputs (DIN0 – DIN3) for added system protection.
The following table illustrates the correlation between the
digital inputs and LIN voltage to the PWM duty cycle.
Table 1. DAC signal and LIN voltage to Duty
Cycle Programming.
DIN3 DIN2 DIN1 DIN0
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
* Guaranteed 0% @ 0000 and 100% @ 1111
LIN
0.500V
0.633V
0.766V
0.900V
1.033V
1.167V
1.300V
1.433V
1.567V
1.700V
1.833V
1.967V
2.100V
2.233V
2.367V
2.500V
Gate Drive
Duty Cycle
0%*
6.7%
13.3%
20.0%
26.7%
33.3%
40.0%
46.7%
53.3%
60.0%
66.7%
73.3%
80.0%
86.7%
93.3%
100%*
PWM Fan Drive
VPP
VPP1 VPP2
VDD
D3 VGATE
D2
D1
D0
HV7100
EN
LIN OUT
CT
RT
VDD
GND
When using direct PWM drive to the fans, it is best to set a
low PWM frequency, in the range of 50Hz -120Hz.
Doc.# DSFP-HV7100
B072413
Supertex inc.
5 www.supertex.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HV7100.PDF ] | |
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