US73EDC [MELEXIS]
Single Coil Fan Driver; 单线圈风扇驱动器
| 型号： | US73EDC |
| 厂家： | 
Melexis Microelectronic Systems |
| 描述： | Single Coil Fan Driver |
| 文件： | 总9页 (文件大小：123K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
US72/73
Single Coil Fan Driver
Features and Benefits
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Full Bridge Driver
High Sensitivity Hall Sensor
Locked Rotor Shutdown and Auto-Restart
Power-Efficient CMOS and Power MOSFETs
Integrated tachometer (US72) or alarm (US73) signal outputs
Applications
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For 12V/24V Fans
Ordering Information
Part No.
US72
US73
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Temperature Suffix
E (-40°C to 85°C)
E (-40°C to 85°C)
Package Code
DC (8-Pin narrow SOIC)
DC (8-Pin narrow SOIC)
Description
Functional Diagram
The US72 and US73 provide a monolithic
Out1
Out2
solution for driving single-coil fans. The bridge
drivers provide bi-directional current through the
single phase motor winding.
3
6
Vdd
1
Regulator
Clamp
8
US72: The tachometer/Frequency Generator
(FG) version produces a logic signal, which is
aligned with the Hall plate signal.
Hall
Amp.
P1
P2
US73: The Rotation Detector (RD) / Alarm
Signal version has a low output in the normal
condition. When a locked rotor condition occurs
the RD changes to a high state.
Gate Drive
Gate Drive
Switching
Logic
2
FG/RD
Locked-Rotor
Protection
N2
N1
Gnd
4
7
5
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Data Sheet
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US72/73
Single Coil Fan Driver
TABLE OF CONTENTS
FEATURES AND BENEFITS................................................................................................................ 1
APPLICATIONS .................................................................................................................................... 1
ORDERING INFORMATION ................................................................................................................. 1
FUNCTIONAL DIAGRAM...................................................................................................................1-1
1.
GLOSSARY OF TERMS............................................................................................................. 3
ABSOLUTE MAXIMUM RATINGS............................................................................................. 3
US72/73 ELECTRICAL SPECIFICATIONS............................................................................... 3
US72/73 MAGNETIC SPECIFICATIONS................................................................................... 4
GENERAL DESCRIPTION......................................................................................................... 4
UNIQUE FEATURES.................................................................................................................. 4
PERFORMANCE GRAPHS........................................................................................................ 5
APPLICATIONS INFORMATION............................................................................................... 6
APPLICATION COMMENTS...................................................................................................... 6
RELIABILITY INFORMATION.................................................................................................... 7
ESD PRECAUTIONS.................................................................................................................. 7
DC PACKAGE INFORMATION (SOIC-8) .................................................................................. 8
DISCLAIMER.............................................................................................................................. 9
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
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Single Coil Fan Driver
1. Glossary of Terms
Full Bridge: Two output drivers that can both source or sink current. When a load is placed between the
drivers, current can flow through the load in both directions.
FG: The Frequency Generator or tachometer signal; provides one pulse for every magnetic pole
RD: The Rotation detection or Lock Alarm signal is high when the rotor is blocked or spinning very slowly.
MilliTesla (mT), Gauss: Units of magnetic flux density; 1 milliTesla = 10 Gauss
Single Coil Fan: a fan with only one coil winding, usually requiring a bipolar or full-bridge driver
Locked rotor: The condition of a fan that has stopped spinning due to mechanical blockage
2. Absolute Maximum Ratings
Supply Voltage, VDD (overvoltage)
Output Voltage, FG or RD
Output Current, IOUT
28V
28V
500mA
-40 to 85°C
125°C
Operating Temperature Range, TA
Junction Temperature, Tj
Storage Temperature, Ts
-55 to 150°C
2KV
ESD Sensitivity (AEC Q100 002)
Magnetic Flux Density
No limit
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
3. US72/73 Electrical Specifications
DC Operating Parameters TA = 25oC, VDD = 12V (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Supply Voltage
VDD
IDD
Operating
4.5
28
Volts
Supply Current
VDD = 24V, No Load
Full bridge, Rnmos + Rpmos
Peak
4
3
6
mA
Ohms
mA
On Resistance
Rdson
Iload
Iload
Rth
5.3
500
350
Bridge Current
Bridge Current
Continuous
mA
oC/Watt
Thermal Resistance
Locked-Rotor Period
Locked-Rotor period
Freewheel Switching delay
FG/RD Output Leakage
FG/RD On voltage
one-sided PCB, zero LFPM
150
0.25
1.25
200
ton
S
S
toff
tfw
uS
Ioff
Vout = 24V
Iout = 5mA
10
uA
Volts
Vdson
0.5
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Single Coil Fan Driver
4. US72/73 Magnetic Specifications
DC Operating Parameters TA = 25, TA = 25oC, VDD = 12V (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Operate Point
Release Point
Hysteresis
Bop
Brp
Hys
3.0
-3.0
6.0
6.0
mT
mT
mT
-6.0
Note:
1 mT = 10 Gauss
5. General Description
The US72 / US73 provide a one-chip solution for 2-wire or 3-wire fans with a single coil winding. The chip
contains the Hall-effect sensor, dynamic offset correction, and power drivers in a single package. The
output drivers and supply pins are fully protected against switching transients. The FG or RD open-drain
signal outputs are compatible with any TTL or CMOS logic input.
6. Unique Features
The switching of the load current is controlled to limit current slew-rate, and eliminate shoot-through
currents. The 200uS (typical) recirculation allows the current to decay, reducing the switching noise.
The built-in locked-rotor protection will automatically shut off the coil current when the rotor is
mechanically blocked, or the rotational speed drops below 60 RPM. The fan will try to restart every 1.5
seconds until the obstruction is clear. The On / Off cycling reduces the average stall current to 1/6
normal; this is enough to prevent overheating or damage to most fans.
A common two-coil fan with unipolar drivers only uses half of the coil windings at any time. The one-coil
design with full-bridge drivers uses all the windings all the time to generate torque. This generally allows
for a smaller, more efficient stator design.
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Data Sheet
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Single Coil Fan Driver
7. Performance Graphs
Rdson (NMOS + PMOS)
Rdson (NMOS + PMOS)
vs.
vs.
Vdd, Temperature
Vdd, Temperature
US72 / 73
US72 / 73
10
8
10
8
4 V
6
6
125
25
5 V
12 V
30 V
4
4
2
2
0
0
4
8
12
16
20
24
28
-40
0
40
80
120
Junction Temperature (C)
Vdd Voltage (V)
Bop, Brp
vs.
Bop, Brp
vs.
Temperature
Vdd Voltage
US72 / 73
US72 / 73
5
3
5
3
Bop
Bop
Brp
1
1
-1
-3
-5
-1
-3
-5
Brp
0
10
20
30
-40
0
40
80
120
Vdd (Volts)
Junction Temperature (C)
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Data Sheet
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Single Coil Fan Driver
8. Applications Information
The optional diode
protects against
reverse voltage
5V - 24V
1
0.1uF minimum
bypass capacitor
FG / RD
open drain
Hall Sensor Location
8
7
6
5
Hall
plate
0.270
Die
1.950
center of
package
0
1
2
4
3
0
0.130
2.438
center of package
Measurements in mm.
Tolerance +/- 0.15 mm.
9. Application Comments
It is advisable to use a Vdd – ground bypass capacitor of at least 0.1uF, located close to the device.
Ceramic / monolithic types are preferrable. This capacitor is necessary to maintain a stable power supply
during the switching transients – especially if there is a series diode in the circuit.
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Single Coil Fan Driver
10. Reliability Information
This Melexis device is classified and qualified regarding soldering technology, solderability and moisture
sensitivity level, as defined in this specification, according to following test methods:
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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)
CECC00802
Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed
Quality
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EIA/JEDEC JESD22-B106
Resistance to soldering temperature for through-hole mounted devices
EN60749-15
Resistance to soldering temperature for through-hole mounted devices
MIL 883 Method 2003 / EIA/JEDEC JESD22-B102
Solderability
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.
Based on Melexis commitment to environmental responsibility, European legislation (Directive on the
Restriction of the Use of Certain Hazardous substances, RoHS) and customer requests, Melexis has
installed a Roadmap to qualify their package families for lead free processes also.
Various lead free generic qualifications are running, current results on request.
For more information on manufacturability/solderability see quality page at our website:
http://www.melexis.com/html/pdf/MLXleadfree-statement.pdf
11. 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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Single Coil Fan Driver
12. DC Package Information (SOIC-8)
8
7
6
5
3.81
3.99
5.79
6.20
0.38
1.27
2
1
4
3
0.33
0.51
1.27
0o to 8o
4.80
4.95
1.47
1.73
0.010 min.
Notes:
1. Measurements in millimeters.
2. Body dimensions do not include mold flash, protrusions, or burrs - not to exceed 0.15mm .
3. Lead frame material: copper 194.
4. Tolerances: +/- 0.25 mm unless otherwise indicated.
.
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Single Coil Fan Driver
13. 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 13 67 04 95
All other locations:
Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com
E-mail: sales_usa@melexis.com
ISO/TS16949 and ISO14001 Certified
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