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UH477G-G04-K Datenblatt(PDF) 5 Page - Unisonic Technologies

Teilenummer UH477G-G04-K
Bauteilbeschribung  SINGLE PHASE DC MOTOR DRIVE IC
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Hersteller  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UH477G-G04-K Datenblatt(HTML) 5 Page - Unisonic Technologies

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UH477
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
5 of 6
www.unisonic.com.tw
QW-R109-028.b
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).
C
ON
C
C
I
V
V
R
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
B wire
+VC
RC
Y wire
VCC
C1
NO
SO
UH477
GND
D1
L1


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