Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UM2640
Preliminary
CMOS IC
TWO-PHASE UNIPOLAR DC
BRUSHLESS MOTOR
PRE-DRIVER IC
„
DESCRIPTION
UTC UM2640 is a 2-phase pre-driver IC for unipolar DC brushes
motors. It features high voltage bipolar technology so that the driver
works up to 48V. High voltage operation delivers more power and
improves power supply efficiency. Therefore, it is suitable for high
voltage fan motor applications.
„
FEATURES
* Wide supply voltage range of 4V~55V
* Absolute Maximum Voltage 60V
* Lock protection.
Auto-restart when the motor lock is undone.
* Lock Alarm Output Terminal
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UM2640L-SO8-R
UM2640G-SO8-R
UM2640L-SO8-T
UM2640G-SO8-T
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Copyright © 2011 Unisonic Technologies Co., Ltd
Package
Packing
SOP-8
SOP-8
Tape Reel
Tube
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Preliminary
CMOS IC
PIN CONFIGURATION
VCC 1
8 OUT2
H1 2
7 OUT1
LA 3
6 Ct
H2 4
5 GND
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
VCC
H1
LA
H2
GND
Ct
OUT1
OUT2
DESCRIPTION
Supply voltage
Positive input for hall amplifiter
Lock alarm output
Negative input for hall amplifiter
Ground
Timing capacitance
Output voltage
Output voltage
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Preliminary
CMOS IC
BLOCK DIAGRAM
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Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
60
V
Hall Input Voltage Range
VIH
-0.3~VCC
V
Output Current
IOUT
30
mA
Lock Alarm Output Voltage
VOLA
60
V
Hall Input Differential Voltage
VIHD
2
V
Lock Alarm Output Current
IOLA
20
mA
Power Dissipation
PD
375
mW
Operating Temperature
TOPR
-40~85
°C
Storage Temperature
TSTG
-55~150
°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.
„
ELECTRICAL CHARACTERISTICS (VCC=48V, TA = 25°C)
PARAMETER
Operating Supply Voltage Range
Operating Current
Hall Input Hysterisis Range
Hall Amplifier Input Bias Current
Hall Input Common Mode Voltage
Output Voltage
Output Leak Current
Lock Alarm Output Voltage
Lock Alarm Leak Current
Ct Charge Current
Ct Discharge Current
Charge/Discharge Current Ratio
Ct H Level Cense Voltage
Ct L Level Cense Voltage
Auto Protection Release ON Time
Auto Protection Release OFF Time
SYMBOL
VCC
ICC
VHYS
IB
VICM
VOUT
ILEAK
VLA
MIN
4.0
VCC=24V
VCC=48V
8
TYP
48.0
3.0
3.8
20
0.5
1.5
IOUT=10mA
VCC=60V
Lock Alarm ON, ILA=5mA
VLA=60V
VCt=1.5V
VCt=1.5V
ILA-LEAK
ICHG
IDCHG
ICHG/IDCHG
VCtH
VCtL
TON
Ct=0.47µF
TOFF
Ct=0.47µF
UNISONIC TECHNOLOGIES CO., LTD
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TEST CONDITIONS
MAX
55.0
4.0
4.8
32
1.0
Vcc-2
Vcc-1.5
5
0.5
10
4.0
2.2
0.6
3.8
0.75
5.5
2.5
0.7
0.25
1.25
8.0
2.8
0.8
UNIT
V
mA
mV
µA
V
V
µA
V
µA
µA
µA
V
V
s
s
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Preliminary
CMOS IC
APPLICATION INFORMATION
The UTC UM2640 is a two-phase unipolar DC brushes motor pre-driver IC that features high voltage process
technology so that the driver works up to 60V.
It is suitable for high voltage fan motor applications where 48V operation is required.
[example of application circuit]
[Design Notes]
Above application example is designed for 48V operation with motor current of 300mA. It uses the following
components:
Hall Elements: HW101A (AKD)
TR1, TR2: 2SC4027A (UTC)
1. Design of R4 and R5
R4 =
VCC - VBE - VCE
IB
Where; VCC is 48V, VCE of UTC UM2640 is 1.5V, VBE of TR1 is 0.7V. IB is the base current of TR1.
The pull down resistance R5 (connected to TR1) influences turn-off time of TR1.
A typical R5 value is ranging from 1kΩ to 10kΩ. It is highly recommended to determine the value with actual
application for better noise performance.
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Preliminary
CMOS IC
APPLICATION INFORMATION(Cont.)
2. Design of Ra and Ca
Ra and Ca must be used if VCC exceeds operating voltage range of UTC UM2640.
Example of VCC 60V Application
Given that current consumption of UTC UM2640 is 4mA (at VCC=48V), Ra is given by:
60 - 48
Ra =
= 3kΩ
4 × 10 -3
Ca is needed if UTC UM2640 is oscillated or shows unstable operation. A typical value of Ca is from 0.01µF to
0.1µF. A ceramic type is recommended and it must be placed near VCC and Gnd.
By insertion of Ra and Ca,the ESD immunity is improved greatly.
3. Design of D2
If an application requires active power on and off, TR1 (TR2) may be damaged or resulted in destruction.
In such application, adding diode between motor winding and Gnd will reduce the damage.
4. Design of ZD1 and ZD2
Zenner diodes are used for limiting kick back voltage of motor winding generated when power transistors is (TR1
and TR2) turned off from on.
There are two methods to consume kick back voltage:
1) Inserting ZD1 (zenner diode connected between Base and Collector of TR1) Energy of kick back voltage is
consumed by TR1 (or TR2). When ZD1 is in operation, Collector voltage is sum of Vbe and ZD1. Therefore,
breakdown voltage of ZD1 must be lower than that of TR1.
2) Inserting ZD2 (zenner diode connected between Collector and Emitter of TR1) Energy of kick back voltage is
consumed by ZD2. To protect TR1, breakdown voltage of ZD2 must be lower than that of TR1.
This method is generally used when Energy of kick back voltage is large. In such application, power rating of ZD
must take in consideration.
5. Selection of C1 and D1:
C1 is used to weaken noise. A typical value is 0.1uF.
Optimize the value in actual operating conditions if necessary. D1 is a diode for protecting against reverse voltage
supply. Silicon rectifier diode is appropriate.
6. Design of R1 and R2
Hall amplifier is a differential amplifier with hysteresis characteristics (24mV typical).
The common-mode input voltage is between 1.5V and VCC-2V and the input signal must be within the range.
Non-excitation hall bias voltage is to be set at a half of VCC for effective use of common-mode input voltage range.
Therefore the same value of hall bias resistors is selected for R1 and R2.
The output voltage of hall elements is effected by the bias current and magnetic flux density of hall elements.
The optimum input voltage of UTC UM2640 is 100mVp-p and higher. With such input voltage, the highest
efficiency can be obtained.
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Preliminary
CMOS IC
APPLICATION INFORMATION(Cont.)
7. Design of C2:
Lock Protection Function, consists of Motor Lock Detection and Auto Resume Function, is a safety feature to
protect a motor and a driver circuit from fatal destruction in case of motor halt.
Motor Lock Detection detects motor halt due to irregular load conditions and then cuts motor driving current for
safety operation. When Lock Detection is activated; Lock Alert Out (LA: Pin 3) goes to L.
A value of C2 determines Lock detection time (Ton) and Auto Resume Time (Toff).
Lock detection time (Ton) is given by:
Vch - Vcl
[sec]
TON = C2
Ic
Where C2 is 0.47uF:
2 .5 - 0 .7
TON = 0.47 × 10 -6 ×
= 0.22[sec]
3.8 × 10 -6
Auto Resume Time (Toff) is given by:
Vch - Vcl
TOFF = C2
[sec]
Idc
Where C2 is 0.47uF:
2 .5 - 0 .7
TOFF = 0.47 × 10 - 6 ×
= 1.13[sec]
0.75 × 10 - 6
A typical value of C2 is either 0.47uF or 1uF depending on a motor.
Lock Protection
Lock Alert Out (LA: Pin 3) is a open collector output and R3 is a pull up resister. A typical value of R3 is 10kΩ.
It must be noted that Lock Alert Out stays an H state during few hundred milliseconds from power up as shown in
the picture below.
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UM2640
Preliminary
CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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