US62 [MELEXIS]
Two-coil fan driver; 双线圈风扇驱动器
| 型号： | US62 |
| 厂家： | 
Melexis Microelectronic Systems |
| 描述： | Two-coil fan driver |
| 文件： | 总11页 (文件大小：408K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
US62 / US63
Two-coil Fan Driver
Features and Benefits
Application Examples
ꢀ Low cost
ꢀ 5/12V fans
ꢀ High sensitivity Hall Sensor
ꢀ Peak current up to 400mA
ꢀ Locked rotor protection and auto-restart
ꢀ Power-efficient CMOS and power MOSFETs
ꢀ Built-in output protection clamping diode
ꢀ Integrated tachometer (US62) or alarm (US63)
signal protected output
ꢀ 2-coil fan driver with FG/RD output in
4-pin VK package RoHS Compliant
Ordering Information
Part No.
US62
US63
Temperature Code
E (-40°C to 85°C)
E (-40°C to 85°C)
Package Code
VK (4-pin TO-92)
VK (4-pin TO-92)
1 Functional Diagram
2 General Description
The US62/63 is a one-chip solution for driving two-
coil brushless DC cooling fans.
Based on the advanced Melexis CMOS process,
the IC contains a Hall-effect sensor, dynamic
offset correction and low side output drivers.
Frequency Generator or Rotation Detection is
available. The open-drain output makes easier the
connectivity with any external interface such as
hardware monitoring or Super I/O IC.
These features are combined with the Melexis
patented no-VDD design to fit the IC in a small 4-
pin VK package.
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Data Sheet
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US62 / US63
Two-coil Fan Driver
Table of Contents
1 Functional Diagram ........................................................................................................ 1
2 General Description........................................................................................................ 1
3 Glossary of Terms .......................................................................................................... 3
4 Absolute Maximum Ratings........................................................................................... 3
5 Pin Definitions and Descriptions................................................................................... 3
6 General Electrical Specifications .................................................................................. 4
7 Magnetic Characteristics ............................................................................................... 4
8 Driver Output vs Magnetic Pole..................................................................................... 4
9 Detailed General Description......................................................................................... 5
10 Unique Features............................................................................................................ 5
11 Performance Graphs .................................................................................................... 6
11.1 RDSON vs TJ ............................................................................................................... 6
11.2 RDSON vs VDD ............................................................................................................. 6
11.3 Magnetic Parameters vs TJ ....................................................................................... 6
11.4 Magnetic Parameters vs VDD..................................................................................... 6
11.5 IDD vs VDD .................................................................................................................. 6
12 Test conditions ............................................................................................................. 7
12.1 VDD œ operating......................................................................................................... 7
12.2 RDSON ........................................................................................................................ 7
12.3 IDD ............................................................................................................................. 7
12.4 FG/RD Output Low Voltage ...................................................................................... 7
13 Application Information................................................................................................ 8
13.1 Typical application with pull-up resistor..................................................................... 8
13.2 Configuration for reverse voltage / ground hot-switch protection.............................. 8
14 Application Comments................................................................................................. 8
15 Standard information regarding manufacturability of Melexis products with
different soldering processes........................................................................................... 9
16 ESD Precautions........................................................................................................... 9
17 VK Package Information (4-pin TO-92)...................................................................... 10
18 Disclaimer.................................................................................................................... 11
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Data Sheet
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US62 / US63
Two-coil Fan Driver
3 Glossary of Terms
Two-coil fan
A fan with two-coil windings where current alternates from 1 coil to the other
depending on the direction of the magnetic field.
Units of magnetic flux density :
MilliTesla (mT), Gauss
1mT = 10 Gauss
VDD
IDD
Voltage on the common point of the fan coils.
Current supplying the chip which flows through the coil connected to the
switched off output driver.
Peak output current
The current flowing in the coil at start-up, only limited by the coil resistance
RCOIL and the output driver resistance RDSON.
Continuous output current The current flowing in the coil when the fan is spinning normally.
Locked rotor
FG
The state when the fan stopped spinning due to mechanical blockage.
Frequency generator or tachometer output
RD
Rotation detection or alarm output
LFPM
Linear Feet Per Minute œ Unit of airflow velocity
4 Absolute Maximum Ratings
Parameter
Symbol
Value
18
400
250
-40 to 85
125
Units
V
mA
mA
°C
Fan Supply Voltage
Peak Output Current
Continuous Output Current
Operating Temperature Range
Junction Temperature
VDD
IOUTp
IOUTc
TA
TJ
°C
Storage Temperature Range
Magnetic Flux Density
ESD Sensitivity (AEC Q100 002)
Table 1: Absolute maximum ratings
TS
-55 to 150
Unlimited
2
°C
mT
kV
B
-
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.
5 Pin Definitions and Descriptions
Pin Name
FG (RD)
OUT1
OUT2
GND
Pin number
Function
1
2
3
4
Frequency Generator (Rotation Detection) open drain output signal
Open Drain Coil Driver 1
Open Drain Coil Driver 2
Ground pin
Table 2: Pin definitions and descriptions US62 (US63)
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Data Sheet
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US62 / US63
Two-coil Fan Driver
6 General Electrical Specifications
DC Operating Parameters TA = 25oC, VDD = 5V to 12V (unless otherwise specified)
Parameter
Fan Supply Voltage
Symbol Test Conditions
Min
3.2(1)
Typ Max Units
VDD
18
V
Operating œ RCOIL = 50Ω
Supply Current
IDD
2
4
mA
OUT1, OUT2 ON Resistance
OUT1, OUT2 ON Resistance
RDSON 1,2 VDD = 5V
RDSON 1,2 VDD = 12V
3.5
2.5
Ω
Ω
OUT1, OUT2 Output Clamp Voltage VOUT1,2
36
18
V
mV
V
µA
mA
FG / RD Output Low Voltage
FG / RD Output Clamp Voltage
FG / RD Output Leakage Current
FG / RD Output Current Limit
Package Thermal Resistance
Locked Rotor Period
VOL
IOL = 10mA
250
500
10
VCLMP
ILEAK
IFGLIM
RTH
VFG (VRD) = 18V
VFG (VRD) = 12V
One-sided PCB, zero LFPM
20
200
0.22
1.3
°C/Watt
S
S
us
TON
Locked Rotor Period
Output Switching Delay
TOFF
TDELAY
—Dead time“ when both drivers are off
100
Table 3: Electrical specifications
Note 1: The minimal value of VDD should be determined using the following equation:
VDD = 3V + RCOIL * IDD
7 Magnetic Characteristics
DC Operating Parameters TA = 25oC, VDD = 12V (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Operate point
Release point
Hysteresis
BOP
BRP
BHYST
3
-3
6
6
mT
mT
mT
-6
2
Table 4: Magnetic specifications
8 Driver Output vs Magnetic Pole
Parameter
Test Conditions
OUT1
OUT2
North pole
B < BRP
High
Low
South pole
B > BOP
Low
High
Table 5: Driver output vs magnetic pole
Note 1: The magnetic pole is applied facing the branded side of the package
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Data Sheet
Oct/05
US62 / US63
Two-coil Fan Driver
9 Detailed General Description
The US62/63 is a one-chip solution for driving two-coil brushless DC fans. Based on advanced Melexis
CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.
The output drivers OUT1 and OUT2 are fully protected against switching transients. So there is no need for
an external zener diode to cut the high voltage spikes induced by the fan coils.
The US62 has an open-drain integrated tachometer FG output that follows the Hall signal.
In the US63, the open-drain rotation detection output RD is active low during normal spinning of the motor. It
goes high when the flux switching frequency becomes too low, which means the motor is blocked.
10 Unique Features
The FG/RD output driver provides an over current protection limiting the current flowing in the FG/RD driver
while switched ON. It can occur if a too small pull-up resistor is used or if this resistor is short connected.
This protection helps avoid EOS damage on the FG/RD driver.
The absence of a VDD pin enables the two low side output drivers and FG/RD signal output to fit in a four-pin
VK package. The lack of a VDD pin decreases also the probability to damage the chip due to reverse voltage
connection, using the coil resistance to limit the reverse current. In this condition, the total reverse current is
twice the peak current value of the fan used.
The built-in locked-rotor protection automatically shuts off the coil current when the rotor is mechanically
blocked, or the rotational speed becomes too low. The fan tries to restart every 1.3 seconds until the rotation
of the shaft is allowed again. The On / Off cycling reduces the average current to 1/7 normal. It is enough to
prevent overheating or damage to most fans.
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Data Sheet
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US62 / US63
Two-coil Fan Driver
11 Performance Graphs
11.1 RDSON vs TJ
14
11.2 RDSON vs VDD
14
US62 / US63
US62 / US63
12
12
10
8
10
VDD = 5V
Rdson , Tj = -40°C
Rdson , Tj = 25°C
Rdson , Tj = 125°C
VDD = 12V
8
6
4
2
0
6
4
2
0
0
5
10
15
-40
0
40
Junction Temperature (°C)
80
120
VDD
11.3 Magnetic Parameters vs TJ
11.4 Magnetic Parameters vs VDD
US62 / US63
US62 / US63
10
10
8
8
Bop, VDD = 5V
Bop, VDD = 12V
Bop, Tj = 25°C
6
4
Brp, VDD = 5V
Brp, VDD = 12V
6
Bop, Tj = 125°C
Brp, Tj = 25°C
4
Brp, Tj = 125°C
2
2
0
0
-2
-4
-6
-8
-10
-2
-4
-6
-8
-10
-40
0
40
80
120
0
5
10
15
Junction Temperature (°C)
VDD
11.5 IDD vs VDD
4
3.5
3
2.5
2
Tj = 25°C
1.5
1
0.5
0
0
5
10
15
VDD
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Data Sheet
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US62 / US63
Two-coil Fan Driver
12 Test conditions
12.1 VDD œ operating
12.2 RDSON
12.3 IDD
12.4 FG/RD Output Low Voltage
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Data Sheet
Oct/05
US62 / US63
Two-coil Fan Driver
13 Application Information
13.1 Typical application with pull-up
resistor
13.2 Configuration for reverse voltage /
ground hot-switch protection
14 Application Comments
Figure 13.2 shows the application including several external protections.
The diode DREVPROT best protects the chip and fan coils for reverse voltage condition.
The capacitor CBYPASS is recommended if the supply ground may be disconnected while running even though
the positive supply point is still connected. This capacitor provides a path to ground for the remaining energy
in the coil which has to be evacuated. Without it, the energy can flow from OUT1/OUT2 to the FG/RD driver,
without any limitation and may cause EOS damage.
Its value has to be tuned depending on the coils characteristics. Bigger inductance requires bigger capacitor.
The optional capacitor CFILTER suppresses wire disturbances on the FG/RD output line.
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Data Sheet
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US62 / US63
Two-coil Fan Driver
15 Standard information regarding manufacturability of Melexis
products with different soldering processes
Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity
level according to following test methods:
Reflow Soldering SMD‘s (Surface Mount Devices)
•
•
•
IPC/JEDEC J-STD-020
Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices
(classification reflow profiles according to table 5-2)
EIA/JEDEC JESD22-A113
Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing
(reflow profiles according to table 2)
Melexis Working Instruction 341901308
Wave Soldering SMD‘s (Surface Mount Devices) and THD‘s (Through Hole Devices)
•
•
•
EN60749-20
Resistance of plastic- encapsulated SMD‘s to combined effect of moisture and soldering heat
EIA/JEDEC JESD22-B106 and EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Melexis Working Instruction 341901309
Iron Soldering THD‘s (Through Hole Devices)
•
•
EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Melexis Working Instruction 341901309
Solderability SMD‘s (Surface Mount Devices) and THD‘s (Through Hole Devices)
•
•
EIA/JEDEC JESD22-B102 and EN60749-21
Solderability
Melexis Working Instruction 3304312
For all soldering technologies deviating from above mentioned standard conditions (regarding peak
temperature, temperature gradient, temperature profile etc) additional classification and qualification tests
have to be agreed upon with Melexis.
The application of Wave Soldering for SMD‘s is allowed only after consulting Melexis regarding assurance of
adhesive strength between device and board.
For more information on the lead free topic please see quality page at our website:
http://www.melexis.com/quality.asp
16 ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
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Data Sheet
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US62 / US63
Two-coil Fan Driver
17 VK Package Information (4-pin TO-92)
1.55+/-0.10
0.73+/-0.10
5.22+/-0.10
4.20+/-0.10
Notes:
3°+2 (2X)
+2
1. All dimensions are in millimeters
5° (2X)
-1
2. Package dimension exclude molding flash.
Mold flash shall not exceed 0.127mm.
3. To preserve reliability, it is recommended to
have total lead length equal to 2.5mm
+0.02
- 0.03
0.46
minimum, measured from the package line.
0.00
0.20
4. VK package is a pin though-hole package,
hence adapted for wave soldering process.
A reflow soldering process is not
recommended with VK package as it may
seriously affect device reliability.
Marking:
1st Line : US62 (US63) - Name of the device
2nd Line : xxxxx - the last 5 digits of lot number
0.38+/-0.03
0.38+/-0.03
1.27+/-0.03
3.81+/-0.03
+2
-1
5°
(2X)
0.30+/-0.10
(2X)
3°+2
(2X)
Hall plate location
1.99+/-0.13
0.52 TYP
Notes:
1. All dimensions are in millimeters
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Data Sheet
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US62 / US63
Two-coil Fan Driver
18 Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its
Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with Melexis for current information. This
product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-
support or life-sustaining equipment are specifically not recommended without additional processing by
Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be
liable to recipient or any third party for any damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential
damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical
data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis‘ rendering
of technical or other services.
© 2002 Melexis NV. All rights reserved.
For the latest version of this document, go to our website at
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
Phone: +32 1367 0495
All other locations:
Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com
E-mail: sales_usa@melexis.com
ISO/TS 16949 and ISO14001 Certified
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Data Sheet
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