Product category:
Power Supply ICs and Controllers
News Release from: Zetex | Subject: ZXBM1015
Edited by the Electronicstalk Editorial
Team on 19 April 2005
Predriver chip stays in spec
The ZXBM1015 predriver includes a current monitor that enables supply current on startup and stall to be kept permanently within OEM specifications.
For variable or fixed speed control of single-phase brushless DC fans, blowers and pumps, the ZXBM1015 predriver from Zetex Semiconductors includes a current monitor that enables supply current on startup and stall to be kept permanently within OEM specifications The ZXBM1015 produces a PWM output to drive an external H-bridge that in turn drives the motor windings
This article was originally published on Electronicstalk on 24 Jul 2008 at 8.00am (UK)
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Its integral current monitoring circuit measures the voltage across a low value external resistor in the low side of the H-bridge and deduces how much current the motor is taking during each PWM cycle.
If it takes too much, the predriver backs off the PWM drive to reduce the current drawn.
The predriver IC is also the first of its kind to offer a configurable phase commutation delay, which allows OEMs to accurately meet the requirements of different motor sizes and so further optimise efficiency.
The ZXBM1015 has a fixed internal commutation delay of 100us, which can be easily extended or reduced by the simple addition of an external resistor.
The flexibility of the ZXBM1015 solution is demonstrated by its compatibility with thermistor, voltage and PWM control inputs, which support fully adjustable motor speed control in a wide range of equipment, from desktop computers to central heating systems.
With a built-in Hall amplifier, the predriver is compatible with any type of Hall-effect sensor and can provide as a result, pulsed rotor speed and locked rotor alarm outputs.
For a locked rotor condition, the ZXBM1015 puts motor drive outputs into a safe operating mode to protect the H-bridge and motor windings.
Additional features of this miniature TSSOP20 packaged predriver include an adjustable minimum speed setting, to prevent the motor from running either too slowly or not being able to start, and an automatic restart function, set using a single capacitor.
The price of the ZXBM1015 through distributors is US $0.88 in quantities of 1000.
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