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PDF US891 Data sheet ( Hoja de datos )
| Número de pieza | US891 | |
| Descripción | Two-Coil Fan Driver | |
| Fabricantes | MELEXIS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de US891 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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US890 / US891
Two-Coil Fan Driver – High Output Current
Features and Benefits
0 Peak output current up to 1200mA
0 Low start-up voltage
0 Low output resistance
0 High sensitivity integrated Hall Sensor
0 Power-efficient CMOS and power MOSFETs
0 Built-in output protection clamping diode
0 Locked rotor protection and auto-restart
0 Integrated tachometer (US890) or alarm (US891)
signal protected output
0 Low cost
0 2-coil fan driver with FG/RD output in
RoHS Compliant 4-pin VK package
Application Examples
0 5V/12V DC brushless motor/fan
0 PC, server, laptop cooling fan
0 Power supply cooling fan
0 Large and small fan size
Ordering Code
Product Code Temperature Code
US891
E
US890
E
Package Code
VK
VK
Option Code
AAA-000
AAA-000
Legend:
Temperature Code:
Package Code:
Packing Form:
E for Temperature Range -40°C to 85°C
VK for Plastic Single in Line
BU for Bulk
Packing Form Code
BU
BU
Ordering example:
US891EVK-AAA-000-BU
1 Functional Diagram
2 General Description
The US890/891 is a one-chip solution for driving
two-coil brushless DC motors and fans.
Based on the advanced Melexis CMOS process,
the IC contains a Hall-effect sensor, dynamic
offset correction and powerful output drivers with
1200mA peak output current capability.
Specially designed for driving large fans, the
device is optimized for low start-up voltage.
Frequency Generator or Rotation Detection is
available. The open-drain output makes easier the
connectivity with any external interface such as
hardware monitoring or Super I/O IC.
These features are combined with the Melexis
patented no-VDD design to fit the IC in a small 4-
pin VK package.
3901000890
Rev 003
Page 1 of 12
Data Sheet
Apr/12
http://www.Datasheet4U.com
1 page  
US890 / US891
Two-Coil Fan Driver – High Output Current
9 Detailed General Description
The US890/891 is a one-chip solution for driving two-coil brushless DC motors and fans. Based on advanced
Melexis CMOS process, the chip contains a Hall-effect sensor, dynamic offset correction and powerful output
drivers with 1200mA peak output current capability.
The low side output coil drivers are fully protected against switching transients. So an external zener diode is
not needed to cut the high voltage spikes induced by the motor coils.
The US890 has an open-drain integrated tachometer FG output that follows the Hall signal.
In the US891, the open-drain rotation detection output RD is active low during normal spinning of the motor. It
goes high when the flux switching frequency becomes too low, which means the motor is blocked.
10 Unique Features
Specially designed for driving large fans, both ICs have LRP characteristics optimised for low start-up
voltage. At low VDD, fans typically take longer to start up than at higher VDD.
The motor start-up phase (from zero to maximum rotation speed) is illustrated below. Big fans with large
inertia may have slow start-up causing a longer first output pulse after power-on. If this pulse duration is
longer than the LRP TON period, the fan may falsely enter locked rotor condition.
The US890/891 provides an adequate and simple solution to prevent this by automatically adjusting the LRP
period at low voltage. It directly improves the motor start-up reliability.
3901000890
Rev 003
Page 5 of 12
Data Sheet
Apr/12
5 Page 
US890 / US891
Two-Coil Fan Driver – High Output Current
17 VK Package Information (4-pin TO-92)
5.22+/-0.10
4.20+/-0.10
0.00
0.20
1.27+/-0.03
5°
+2
-1
(2X)
3.81+/-0.03
1.55+/-0.10
0.73+/-0.10
3°+2 (2X)
0.46
+0.02
- 0.03
5°+-21 (2X)
Notes:
1. All dimensions are in millimeters
2. Package dimension exclude molding flash.
Mold flash shall not exceed 0.127mm.
3. To preserve reliability, it is recommended to
have total lead length equal to 2.5mm
minimum, measured from the package line.
4. VK package is a pin though-hole package,
hence adapted for wave soldering process.
A reflow soldering process is not
recommended with VK package as it may
seriously affect device reliability.
0.38+/-0.03
0.30+/-0.10
(2X)
0.38+/-0.03
Marking:
1st Line : US890 (US891) - Name of the device
2nd Line : XXYWW
XX - lot number (last 2 digits)
Y - assembly year (last digit)
WW - assembly week number
3°+2
(2X)
1.9
Hall plate location
0.52
Notes:
1. All dimensions are in millimeters
3901000890
Rev 003
Page 11 of 12
Data Sheet
Apr/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet US891.PDF ] | |
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