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PDF UH477 Data sheet ( Hoja de datos )

Número de pieza UH477
Descripción SINGLE PHASE DC MOTOR DRIVE IC
Fabricantes Unisonic Technologies 
Logotipo Unisonic Technologies Logotipo



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UNISONIC TECHNOLOGIES CO., LTD
UH477
Preliminary
LINEAR INTEGRATED CIRCUIT
SINGLE PHASE DC MOTOR
DRIVE IC
DESCRIPTION
The UTC UH477 is particularly designed for a single phase DC
motor driver circuit. It includes hall sensor and output coil drivers. The
range of the operating voltage and the operation current is typically
0.3A.
The UTC UH477 is a well performance integrated IC with less
required external components. The high sensitivity of Hall effect
sensor is suitable for motors from mini-type CPU coolers to blowers
and DC fans.
FEATURES
* Operating Voltage Ranges Widely from 3.0V to 30V
* 1 Chip Hall Sensor/Drivers
* Output Thermal Shutdown Protect Circuit
* Output Sink Current up to 300mA
ORDERING INFORMATION
Ordering Number
UH477G-G04-K
Package
SIP-4
Packing
Bulk
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UH477 pdf
UH477
Preliminary
LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
The Example of Typical Application Circuit
A typical application circuit is shown as follows. The red, yellow, and black wires are the input points of the
motor system: Red--the input of power supply; Yellow--the output of FG; Black--the ground signal. RC is an external
pull-up resistance for the use of measuring FG signal.
The value of RC can be calculated by the transistor saturation voltage (VON), sink current (IC), and off-level
voltage (VC).
RC
VC
VON
IC
For example:
VC=+5V for TTL level; IC= 10mA at 0.2V saturation voltage; The safety value of RC=470Ω
There is a reverse protection diode D1 in the circuit. As if the red and black wires reversely connect with the
power source, the current flows through the ground via IC and coils L1 and L2 to power supply. Under such kind of
circumstances the IC and coils are easy to be burned out. From that, this reverse protection diode is necessary in
the design. Meanwhile, an extra voltage drop on the supply voltage should be taken into consideration, which is
caused by the reverse protection diode.
The capacitor C1 is designed to reduce the ripple noise during the transient of the output stages, and its value
is determined by the coil impedance and characteristics.
R wire
+VC
RC
Y wire
B wire
D1
C1
VCC
NO
L1 UH477
SO
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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