Diodes ZXBM2004 - Manual

ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
ZXBM2004
Document number: DS33433 Rev. 5 - 2
1 of 19
www.diodes.com
February 2012
© Diodes Incorporated
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Description
The ZXBM2004 is a 2-phase, Brushless Direct Current (BLDC)
motor control pre-driver with variable PWM speed control
suitable for fan and blower motors.
For system flexibility, motor speed can be controlled by
changing SPD pin voltage which can be either from Thermistor
network, external voltage or PWM signal.
To help protect the motor coil, the ZXBM2004 provides Rotor
Lock Protection which shuts down the output drive if rotor lock
is detected. The device automatically re-starts when the rotor
lock is removed.
A Tachometer output is provided by open-drain Frequency
Generator (FG) Pin which allows external interface to monitor
motor rotation or speed. The FG output is the magnetic
change frequency.
The ZXBM2004 is available in small space saving low profile
U-QFN3030-16 and QSOP-16 packages.
Features
• Supports two-phase BLDC motor control
• Operating voltage: 4.7V to 18V
o Can be extended with external regulator
• PWM speed control via external Thermister, DC voltage or
PWM signals
• Reference voltage output
• Built-in Hall amplifier allows direct connection of Hall
element
• Rotor Lock Protection (Lock detection, output shutdown
and automatic re-start)
• Rotor lock detect (RD) output
• Minimum speed setting
• Frequency generator (FG) output for speed measurements
• Low
noise
• Space saving low profile U-QFN3030-16 and QSOP-16
packages
• “Green” Molding Compound
Pin Assignments
Applications
•
Desktop PC and Servers fans and blowers
• Instrumentation
fans
•
Central heating blowers
•
Automotive instrument cooling and climate control
• Extractor
fans
•
General motors and pumps
( Top View )
QSOP-16
V
CC
SPD
H +
H-
GND
Ph1
Ph2
C
PWM
C
LCK
FG
RD
V+OP
ThRef
S
MIN
N/C
N/C
1
ZXBM 2004
(Top View )
U-QFN 3030 -16
H-
NC
Ph1
FG
GND
RD
H+ V+
O
P
Ph2
SPD
NC
ThRef
C
PWM
V
CC
S
MI
N
C
LCK