Product category:
Power Supply ICs and Controllers
News Release from: Zetex | Subject: ZXBM2000 series
Edited by the Electronicstalk Editorial
Team on 15 March 2002
Chip takes control of brushless fans and
blowers
The ZXBM2000 series of controller ICs offers a complete variable speed control solution for two-phase, DC brushless fan and blower motors up to 100W.
Integrating rotational speed sensing, locked rotor detection and automatic recovery functions into the ultra small MSOP10 package, the ZXBM2000 series of controller ICs offers a complete variable speed control solution for two-phase, DC brushless fan and blower motors up to 100W The controller's two phase drive outputs deliver up to 80mA to a pair of external mosfet or bipolar transistors connected to the fan motor windings
This article was originally published on Electronicstalk on 24 Jul 2008 at 8.00am (UK)
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Speed control is implemented via the application of a variable external voltage or an NTC thermistor input.
To detect fan rotor position, a built-in Hall amplifier enables Hall sensors to be wired to the controller IC directly and so remove the need for external signal conditioning circuitry.
Four-pin naked Hall sensors or three-pin buffered switching types can be used.
The ZXBM2000 product range comprises three variants offering a choice of diagnostic outputs.
The ZXBM2003 provides a frequency generator (rotor speed) output, the ZXBM2002 offers a locked rotor error output instead, while the ZXBM2001 combines both signals on a dual function pin.
When an obstruction in the fan blade or a seized bearing causes a locked rotor condition, the phase drive outputs go into a safe drive mode to protect the transistor pair and motor windings.
The time spent in the mode is determined by an external timing capacitor or by a clearance of the fault.
When driving 5 to 12V fans, the fan controller IC can be powered directly from the fan motor supply.
For fans operating at voltages above the maximum 18V input level, external regulation is simply added.
The ZXBM2000 series will serve a wide range of mainframe, PC, instrumentation and climate control applications.
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