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AN764
| Title |
Title
Implementing Temperature-Based Variable Fan Speed Control in NLX Power Supplies
|
|---|---|
| Name |
Name
AN764
|
| Date |
Date
06/24/2015
|
| Application Categories |
Application Categories
Automotive /
Body System
Motor Control /
Brushless DC Motors
Power Supply & Conversion /
Thermal Management
Signal Conditioning & Measurement /
Temperature Sensing
|
| Product Categories |
Product Categories
Power Management ICs /
Battery Management
Thermal Management /
Fan Controllers
|
| Description |
Description
The NLX Power Supply Specification released by Intel Corp. defines the requirements for next-generation PC system power supplies. There are several enhancements outlined in this specification as compared to the ?old? PS/2 power supply form factor. One of these features is control and monitoring of the cooling fan(s) inside the NLX power supply. The NLX specification designates two interface fan control signals: 1. FanM signal is an output from the NLX-compliant power supply. This signal allows the host (typically a system management ASIC) to monitor fan RPM. FanM is an open-collector signal consisting of two pulses per fan rotation. 2. FanC is an input to the NLX-compliant power supply used by the motherboard to regulate fan speed and to shut the fan down. FanC is a 0V to 12V analog signal.
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