Diodes ZXBM1021 User Manual
Description, Features, Pin assignments
ZXBM1021
Document number: DS36322 Rev. 2 - 2
1 of 25
April 2014
© Diodes Incorporated
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 and industry standard QSOP-20 packages.
Features
Operating voltage: 6.8V to 18V
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
Lock detection, output shutdown and automatic re-start
Minimum speed setting
Frequency generator (FG) output
Thermally enhanced space saving low profile U-QFN4040-20 and
industry standard QSOP-20 packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
V
C
C
H
+
ThRef
PWMSPD
C
SPD
C
L
C
K
P
h
2
H
i
H
-
SPD
S
M
IN
F
G
Ph1Lo
Ph2Lo
Ph1Hi
SetThRef
Sense
S
e
tT
h
G
N
D
V
+
O
P
HBIAS
ZXBM1021
U-QFN4040-20
(Top View)
H+
SetThRef
SPD
H-
GND
Ph1Lo
Ph2Lo
C
SPD
C
LCK
FG
ThRef
S
MIN
1
Ph1Hi
Ph2Hi
Sense
SetTh
V+OP
Vcc
PWMSPD
20
10
11
HBIAS
ZXBM1021
QSOP-20
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
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.