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PDF US3881 Data sheet ( Hoja de datos )
| Número de pieza | US3881 | |
| Descripción | CMOS Low Voltage Hall Effect Latch | |
| Fabricantes | Melexis | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de US3881 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Features and Benefits
• Chopper stabilized amplifier stage
• Optimized for BDC motor applications
• New miniature package / thin, high reliability package
• Operation down to 2.2V
• CMOS for optimum stability, quality, and cost
Applications
m• Solid state switch
• Brushless DC motor commutation
o• Speed sensing
.c• Linear position sensing
• Angular position sensing
U• Current sensing
t4Ordering Information
Part No.
Temperature Suffix
eUS3881
E (-40°C to 85°C)
US3881
L (-40°C to 150°C)
Package
SO (SOT-23) or UA (TO-92)
SO (SOT-23) or UA (TO-92)
he* Contact factory or Sale Representative for legacy temperature options
www.DataS Sheet4U.comFunctional Diagram
Description
The US3881 is a bipolar Hall effect sensor IC
fabricated from mixed signal CMOS technology. It
incorporates advanced chopper stabilization
techniques to provide accurate and stable magnetic
switch points. There are many applications for this
sensor in addition to those listed above. The design,
specifications, and performance have been
optimized for commutation applications in 5V and
12V brushless DC motors.
The output transistor will be latched on (BOP) in the
presence of a sufficiently strong South pole
magnetic field facing the marked side of the
package. Similarly, the output will be latched off
(BRP) in the presence of a North field.
The SOT-23 device is reversed from the UA
package. The SOT-23 output transistor will be
latched on in the presence of a sufficiently strong
North pole magnetic field subjected to the marked
face.
ataNote: Static sensitive device; please observe ESD precautions.
.DReverse VDD protection is not included. For reverse voltage
protection, a 100W resistor in series with VDD is recommended.
ww3901003881
wRev. 012
Page 1
Sept/02
1 page  
Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched
capacitor techniques to eliminate the amplifier
offset voltage, which, in bipolar devices, is a
major source of temperature sensitive drift.
CMOS makes this advanced technique possible.
The CMOS chip is also much smaller than a
bipolar chip, allowing very sophisticated circuitry
to be placed in less space. The small chip size
also contributes to lower physical stress and less
power consumption.
Applications
If reverse supply protection is desired, use a
resistor in series with the VDD pin. The resistor
will limit the Supply Current (Fault), IDD, to 50
mA. For severe EMC conditions, use the
application circuit below.
Installation
Consider temperature coefficients of Hall IC and
magnetics, as well as air gap life time variations.
Observe temperature limits during wave
soldering.
Applications Examples
3901003881
Rev. 012
Page 5
Sept/02
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet US3881.PDF ] | |
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