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Annual Report 2011
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US91A
Two-Coil Fan Driver - High Voltage (Alarm output)
Description
Applications
Documents
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US91A General Description
The US91A is a one-chip solution for driving two-coil brushless DC cooling fans.
Based on Melexis CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.
The integrated Alarm (RD) output is a safety signal which allow to detect if the fan rotates or not. Its open-drain output facilitates the connectivity with external interface for hardware monitoring.
These features are combined with the Melexis patented no-VDD design to fit the IC in a small 4-pin VK package.
US91A Features and Benefits
Low cost
High sensitivity Hall Sensor
Locked rotor protection and auto-restart
Power-efficient CMOS and power MOSFETs
Built-in output protection clamping diode
Integrated alarm signal output
4-pin VK/VA and 8-pin narrow SOIC package (both RoHS Compliant)
Drop-in replacement of US91
US91A Related Products
Part Number
Description
MLX90285
Two Coil Fan Driver - High Voltage & Low Noise
US91A Applications
Application Note
File Type
Size
Revision
Date
Action
Melexis Two Coil Fan Driver - Power Dissipation
PDF
256.7 KB
001
10/31/2007
Trim and form recommendations
PDF
127.1 KB
3.11
4/13/2009
US91A Documentation
DataSheet
File Type
Size
Revision
Date
Action
US90A/US91A Datasheet
PDF
298.1 KB
005
3/25/2011
Reference
File Type
Size
Revision
Date
Action
BLDC Fan Motor Driver Quick Reference
PDF
1.7 MB
004
10/4/2011
US91A Tools
US91A Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Green / Halogen Free Compliance Declaration US91A
PDF
39.7 KB
1.0
11/19/2009
Package Material Declaration - SOIC8 GR - S2
PDF
97.8 KB
7.0
1/25/2012
Package Material Declaration - VA 6300H2L LF - S3
PDF
103.8 KB
7.0
1/25/2012
Package Material Declaration - VK GR - S3
PDF
104.9 KB
7.0
3/21/2012
RoHS Compliance Declaration US91A VA
PDF
37.4 KB
1.0
11/3/2009
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US91A In The Press
US91A Frequently asked Questions
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