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
Lead Free
UH477L-G04-K
Halogen Free
UH477G-G04-K
Package
SIP-4
Packing
Bulk
PIN DESCRIPTION
PIN NO.
1
2
3
4
PIN NAME
V
CC
NO
SO
GND
DESCRIPTION
IC Power Supply
Coil driver output is low state during the N magnetic field.
Coil driver output is low state during the S magnetic field.
IC Ground
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
1 of 6
QW-R109-028.a
UH477
BLOCK DIAGRAM
Preliminary
LINEAR INTEGRATED CIRCUIT
1
Voltage
Regulator
Hall
Element
Temperature
Compensated
Current
Amplifier
2
Latch
Circuit
Hysteresis
Control
Pre-Driver
Sensitivity
Control
Thermal
Shutdown
4
3
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 6
QW-R109-028.a
UH477
PARAMETER
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
RATINGS
UNIT
V
CC
Pin Voltage
30
V
Peak Current
800
mA
Output Peak Sink Current Hold Current
I
OUT
600
mA
Continuous Current
300
mA
T
A
=25°C
600
mW
Power Dissipation
P
D
T
A
=70°C
450
mW
Junction Temperature
T
J
+150
°C
Operating Junction Temperature
T
J
0 ~ +85
°C
Storage Temperature
T
STG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
SYMBOL
DC ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Voltage
Quiescent Supply Current
Output Saturation Voltage
SYMBOL
V
CC
I
CC
V
CE(SINK)
V
CE(DRIVE)
TEST CONDITIONS
V
CC
=30V, No use pin open
V
CC
=14V, I
C
=200mA
V
CC
=14V, I
C
=200mA
MIN
3
TYP
25
0.55
12.5
MAX
30
30
0.8
14
UNIT
V
mA
V
V
AC ELECTRICAL CHARACTERISTICS
PARAMETER
Rise Time
Fall Time
Switch Time Differential
SYMBOL
t
R
t
F
Δt
TEST CONDITIONS
R
L
=820Ω, C
L
=20pF
R
L
=820Ω, C
L
=20pF
R
L
=820Ω, C
L
=20pF
MIN
TYP
0.5
0.5
1.0
MAX
1.0
1.5
0.5
UNIT
μs
μs
μs
MAGNETIC CHARACTERITICS
A Grade
PARAMETER
Operating Point
Release Point
B Grade
PARAMETER
Operating Point
Release Point
C Grade
PARAMETER
Operating Point
Release Point
SYMBOL
B
OP
B
RP
SYMBOL
B
OP
B
RP
SYMBOL
B
OP
B
RP
MIN
10
-45
MIN
-65
MIN
-90
TYP
MAX
90
TYP
MAX
45
-10
MAX
65
UNIT
Gauss
TYP
UNIT
Gauss
UNIT
Gauss
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 6
QW-R109-028.a
UH477
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
UTC UH477
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 6
QW-R109-028.a
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. R
C
is an external
pull-up resistance for the use of measuring FG signal.
The value of R
C
can be calculated by the transistor saturation voltage (V
ON
), sink current (I
C
), and off-level
voltage (V
C
).
V
−
V
ON
R
C
=
C
I
C
For example:
V
C
=+5V for TTL level; I
C
= 10mA at 0.2V saturation voltage; The safety value of R
C
=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
C1
+V
C
D1
V
CC
NO
R
C
Y wire
L1
SO
UH477
GND
B wire
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R109-028.a
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
