ETC US91

US90/91
24VHall IC Fan Driver
Features and Benefits
Power efficient CMOS and Power MOSFET technology
Built-in Zener diodes protection for the power outputs
One chip solution
SOIC-8 package
High sensitivity
Locked Rotor shutdown and auto-restart
Applications
Current Range up to 500mA Peak
For 12V/24V Fans
Ordering Information
Part No.
US90
US91
Temperature Suffix
E (-40°C to 85°C)
E (-40°C to 85°C)
Functional Diagram
Package Code
SO (8-Pin Narrow SOIC)
SO (8-Pin Narrow SOIC)
Description
US90: The Tachometer/Frequency Generator (FG)
version produces a logic signal, which is aligned with
the Hall plate signal.
US91: The Rotation Detector (RD) / Alarm Signal
version has a low output in the normal condition.
When a locked rotor condition occurs the RD output
changes to a high state.
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24VHall IC Fan Driver
Absolute Maximum Ratings
Supply Voltage (Over Voltage), VDD
Output Current (Fault), IOUT
30V
500mA
Operating Temperature Range, TA
-40 to 85°C
Storage Temperature Range, TS
-55 to 150°C
Junction Temperature, TJ
125°C
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolutemaximum-rated conditions for extended periods may affect device reliability.
US90/91 Electrical Specifications
DC operating parameters: TA = 25 oC, VDD = 24V unless otherwise specified.
Parameter
Test Conditions
Min
Typ
Max
Units
Fan Supply Voltage
VDD
Operating
5
-
30
V
Supply Current
IDD
Vdd=5 to 30V
-
2.0
4
mA
Output voltage Clamp
VOUT
B<BHYS
-
65
-
V
Output Saturation voltage
VDSS
IOUT = 150mA
-
375
-
mV
Output Saturation voltage
VDSS
IOUT = 250mA
-
625
-
mV
Operating
-
200
-
°C/Watt
Thermal resistance
Rth
Locked rotor protection on
TLRP-ON
-
0.25
-
Sec
Locked rotor protection off
TLRP-OFF
-
1.5
-
Sec
FG/RD output Vds
Vo-LOW
-
-
0.5
V
FG/RD output high
clamp
Vo-HIGH
28
-
-
V
Max
Units
IOUT = 10mA
US90/91 Magnetic Specifications
DC operating parameters: TA = 25oC, VDD = 24V unless otherwise specified. 1 mT = 10 Gauss.
Parameter
Symbol
Test Conditions
Min
Typ
Operate Point
BOP
Operating
-
3.0
6.0
mT
Release Point
BRP
Operating
-6.0
-3.0
-
mT
Hysteresis
BHYS
Operating
-
6.0
-
mT
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Applications Notes
Without reverse bias protection diode
Recommended with higher than 120 ohm
With reverse bias protection diode
Recommended with lower than 60 ohm coil
Applications Comments
EMC protection is built into the power outputs. EMC considerations require that the fan assembly
should tolerate ESD, reverse voltage, over voltage and not radiate RF noise, which may interfere with
other electronic equipment. These capabilities are built into the chip to meet EMC requirements.
Start and Run Current US90/91 maximum starting current is 500mA. Recommended maximum run
current is 250mA.
Power supply voltage. US90/91 are designed for 24V fan. It is recommended that fan operating
voltage does not exceed 30V and that the supply + BEMF be no more than 60V.
Temperature US90S/91S function up to a junction temperature of 125°C. Hall IC circuitry and power
FET outputs provide low power dissipation, and a cool chip.
Locked Rotor conditions are detected by the IC when there is no motion for 0.25 seconds and will shut
off the motor drive for 1.5 second, then turn on the drive current for 0.25 seconds. This sequence will
continue indefinitely until the locked rotor condition is fixed. This feature prevents overheating.
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US90/91 Hall Plate Location
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Package Dimensions
SO: 8-Pin narrow SOIC
Reel Information is attached ref SOIC08AC90.OP2 There are 2600 parts/reel
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Reliability information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave soldering with
usual (63/37 SnPb-) solder (melting point at 183degC).
The following test methods are applied:
•
•
•
IPC/JEDEC J-STD-020A (issue April 1999)
Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices CECC00802
(issue 1994)
Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality
MIL 883 Method 2003 / JEDEC-STD-22 Test Method 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.
For more information on manufacturability/solderability see quality page at our website: http://www.melexis.com/
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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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 lifesustaining 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: All other locations:
Phone: +32 13 67 04 95 Phone: +1 603 223 2362
E-mail: [email protected] E-mail: [email protected]
QS9000, VDA6.1 and ISO14001 Certified
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