ZXBM1021 Datasheet, PDF (1/24 Pages) Diodes Incorporated – SINGLE PHASE VARIABLE SPEED MOTOR CONTROL PRE-DRIVER

ZXBM1021
SINGLE PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
Description
The ZXBM1021 is a high performance, low noise, single-phase,
Direct Current Brushless (BLDC) motor pre-driver with variable
PWM speed control and current control suitable for fan and blower
motors.
For system flexibility the motor speed can be controlled by either an
external PWM control signal or by a DC voltage signal from an
external control voltage or from a Thermistor network.
To prevent motor inrush current the device has a soft start feature.
To help protect the motor coil, the ZXBM1021 provides rotor lock
protection which shuts down the output drive if rotor lock is
detected. The device automatically re-starts with soft-start when the
rotor lock is removed. The ZXBM1021 monitors the motor current
to provide a programmable over current limit.
A Tachometer output is provided by the open collector output
Frequency Generator (FG) pin which allows external interface to
monitor motor rotation or speed. The FG output is the magnetic
change frequency.
The ZXBM1021 is available in space saving and low profile
U-QFN4040-20 package.
Pin Assignments
(Top View)
U-QFN4040-20
Features
• Operating voltage: 6.8V to 18V
o Can be extended with external regulator
• Speed control via external PWM, DC or Thermistor signals
• Low noise, high efficiency
• Soft start
• Integrated current control
• Reference voltage output
• Built-in Hall amplifier for direct connection of Hall element
• Rotor Lock Protection
o Lock detection, output shutdown and automatic re-start
• Minimum speed setting
• Frequency generator (FG) output
• Thermally enhanced space saving low profile U-QFN4040-20
package
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• Personal, servers and mainframe computers cooling fans
• Instrumentation and equipment cooling fans
• Home appliance fans and blowers
• Central heating blowers and extraction systems
• Industrial fans, blower and extractors
• Hand dryers
• Hand-held power tools
• Pumps
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
ZXBM1021
Document number: DS Draft Rev. 1
1 of 24
www.diodes.com
June 2013
© Diodes Incorporated