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PDF EUM6883MIR1 Data sheet ( Hoja de datos )
| Número de pieza | EUM6883MIR1 | |
| Descripción | 800mA BTL Linear Fan Motor Driver | |
| Fabricantes | Eutech Microelectronics | |
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EUM6883
800mA BTL Linear Fan Motor Driver
DESCRIPTION
EUM6883 is a single-phase full wave DC fan motor
driver. It is used as an interface between a HALL IC
and a single coil brushless motor. With its BTL linear
control and low saturation output stages, EUM6883
silently and efficiently drives a fan motor. The
functions built in EUM6883 are linear control drive
mode, fan tachometer, lock detection, automatic restart,
Hall Bias and thermal shutdown. When output voltage
changes from L to H (or H to L), linear control mode
gently drives the output stage. This makes EUM6883
suitable for the electronics equipment which required
low noise and high reliability. If the motor is stalled by
the external force, overdrive current may incur coil
overheat or burning. To prevent this, the lock detection
circuit shuts off the driver. The automatic restart circuit
resumes powering up the driver after a few seconds.
Rotation detection open drain output is pulled down
when a motor runs. FG is the Fan tachometer output,
and HB provides bias supply for a Hall sensor.
FEATURES
z Linear Control for Single-Phase Full Wave Drive
z Wide Input Range 1.8V~13.8V
z Low Saturation Output Voltage 0.5V @250mA
z FG Tachometer Output
z Lock Detection, Automatic Restart
- RD = L when Rotation; RD = H when Stop
z 1.5V Hall Bias
z Thermal Shutdown Protection
z Available in MSOP-10 Package
z RoHS Compliant and 100% Lead (Pb)-Free,
Halogen-Free
APPLICATIONS
z CPU Cooling Fan
z Car Audio Cooler
z Power Supply Cooling Fan
Block Diagram
DS6883 Ver1.0 Aug. 2009
Figure 1.
1
1 page  
EUM6883Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Application Sections
Hall signal input terminals (H+ H-)
Figure 4. Hall Input Voltage Range
Figure 5. Hall Element
A Hall sensor can be connected to HB or VCC. Use R1
or R2 to limit the current bias to a Hall element. Make
sure the hall signal amplitude input within range of
0.3V~Vcc-1.5V. If the noise influences the hall signal
on the board, connect a small 100pF ceramic capacitor
between IN+ and IN-.
Linear Control Drive Mode
The output signal of EUM6883 is the amplified version
of the hall input signal. When the amplitude of hall
signal is small, the output rises or fail slowly. Oppositely,
the amplitude of hall signal is big, the output rises and
falls quickly. The hall-input/to output gain is about 51dB
(TYP). Adjust Hall input bias current and set Hall signal
amplitude to get an adequate amplitude of the output
signal.
DS6883 Ver1.0 Aug. 2009
5
Figure 6.
The output signal of EUM6883 is the amplified version of
the hall input signal. When the amplitude of hall signal is
small, the output rises or fall slowly. Oppositely, the
amplitude of hall signal is big, the output rises and falls
quickly. The hall-input/to output gain is about 51dB
(TYP). Adjust Hall input bias current and set Hall signal
amplitude to get an adequate amplitude of the output
signal.
Reverse Connection of Power Supply
Reverse connection of power supply will damage the
device. Insert a reverse current protection diode between
power supply and Vcc pin (see Figure3 and Figure 4.)
Power Supply Line
The motor Back Electromotive Force (BEMF) will causes
the motor coil re-circulate current back to power supply.
Connect a 1µF ceramic capacitor between VCC and GND
to absorb the re-circulating current.
Thermal Design
The thermal design should allow enough margin for actual
power dissipation. See Figure 7 for EUM6883 power
dissipation data.
Figure 7. To use temperature above TA=25°C
reduce 6.24mW/°C.
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| PDF Descargar | [ Datasheet EUM6883MIR1.PDF ] | |
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