View US73_1332893.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

US72/73
Single Coil Fan Driver Features and Benefits
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
For 12V/24V Fans
Ordering Information
Part No. US72 US73 Temperature Suffix E (-40 to 85 C C) E (-40 to 85 C C) Package Code DC (8-Pin narrow SOIC) DC (8-Pin narrow SOIC)
Functional Diagram
Out1 3 Out2 6 Vdd 1 Regulator Clamp 8
Description
The US72 and US73 provide a monolithic solution for driving single-coil fans. The bridge drivers provide bi-directional current through the single phase motor winding. US72: The tachometer/Frequency Generator (FG) version produces a logic signal, which is aligned with the Hall plate signal. 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.
P1
Hall Amp.
P2
Gate Drive
Switching Logic
Gate Drive 2 FG/RD
N1
Locked-Rotor Protection
N2
Gnd 4 7 5
3901090261 Rev. 002
Page 1 of 9
Data Sheet May/04
US72/73
Single Coil Fan Driver
TABLE OF CONTENTS FEATURES AND BENEFITS ................................................................................................................ 1 APPLICATIONS .................................................................................................................................... 1 ORDERING INFORMATION ................................................................................................................. 1 FUNCTIONAL DIAGRAM................................................................................................................... 1-1 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 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
3901090261 Rev. 002
Page 1-2 of 9
Data Sheet May/04
US72/73
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 Operating Temperature Range, TA Junction Temperature, Tj Storage Temperature, Ts ESD Sensitivity (AEC Q100 002) Magnetic Flux Density 28V 28V 500mA -40 to 85C 125C -55 to 150C 2KV No limit
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolutemaximum-rated conditions for extended periods may affect device reliability.
3. US72/73 Electrical Specifications
DC Operating Parameters TA = 25 C, VDD = 12V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ
o
Max
Units
Supply Voltage Supply Current On Resistance Bridge Current Bridge Current Thermal Resistance Locked-Rotor Period Locked-Rotor period Freewheel Switching delay FG/RD Output Leakage FG/RD On voltage
VDD IDD Rdson Iload Iload Rth ton toff tfw Ioff Vdson
Operating VDD = 24V, No Load Full bridge, Rnmos + Rpmos Peak Continuous one-sided PCB, zero LFPM
4.5 4 3
28 6 5.3 500 350 150 0.25 1.25 200
Volts mA Ohms mA mA
oC/Watt
S S uS 10 0.5 uA Volts
Vout = 24V Iout = 5mA
3901090261 Rev. 002
Page 3 of 9
Data Sheet May/04
US72/73
Single Coil Fan Driver 4. US72/73 Magnetic Specifications
DC Operating Parameters TA = 25, TA = 25 C, VDD = 12V (unless otherwise specified) Parameter Operate Point Release Point Hysteresis Symbol Bop Brp Hys -6.0 Test Conditions Min Typ 3.0 -3.0 6.0 Max 6.0 Units mT mT mT
o
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.
3901090261 Rev. 002
Page 4 of 9
Data Sheet May/04
US72/73
Single Coil Fan Driver 7. Performance Graphs
Rdson (NMOS + PMOS) vs. Vdd, Temperature
US72 / 73 10 8 Rdson (Ohms)
Rdson (Ohms) 10 8
Rdson (NMOS + PMOS) vs. Vdd, Temperature
US72 / 73
4V 6 4 2 0 -40 5V 12 V 30 V
6 4
125
25 2 0
0
40
80
120
4
8
12
16
20
24
28
Junction Tem perature (C)
Vdd Voltage (V)
Bop, Brp vs. Temperature
5 Bop 3 Bop, Brp (mT) US72 / 73
Bop, Brp vs. Vdd Voltage
US72 / 73 5 Bop 3 Bop, Brp (mT) 1 -1 Brp -3 -5
1 -1 Brp -3 -5 -40 0 40 80 120
0
10
20
30
Junction Temperature (C)
Vdd (Volts)
3901090261 Rev. 002
Page 5 of 9
Data Sheet May/04
US72/73
Single Coil Fan Driver 8. Applications Information
The optional diode protects against reverse voltage
5V - 24V
Out2 Out1 Vdd Vss Vss Vss
1
0.1uF minimum bypass capacitor
FG/RD
Vdd
FG / RD open drain
Hall Sensor Location
8 7 6 5
Hall plate 0.270 Die
1.950 center of package 0 0
1
2
3
0.130
4
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.
3901090261 Rev. 002
Page 6 of 9
Data Sheet May/04
US72/73
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: 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 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.
3901090261 Rev. 002
Page 7 of 9
Data Sheet May/04
US72/73
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
1
2
3
4
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.
.
3901090261 Rev. 002
Page 8 of 9
Data Sheet May/04
US72/73
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. (c) 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 E-mail: sales_europe@melexis.com
All other locations:
Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com
ISO/TS16949 and ISO14001 Certified 3901090261 Rev. 002 Page 9 of 9 Data Sheet May/04

▲Up To Search▲

Price & Availability of US73

	To Download US73 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .