ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
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.
NC
ThRef
SPD
C
PWM
GND
C
LCK
S
MIN
Pin Assignments
( Top View )
H+
H-
N/C
ThRef
SPD
C
PWM
S
MIN
GND
ZXBM 2004
1
NEW PRODUCT
V
CC
V+OP
Ph1
Ph2
N/C
FG
RD
C
LCK
QSOP-16
(Top View )
H-
H+
V
CC
V+OP
Ph1
Ph2
NC
FG
RD
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
U-QFN 3030 -16
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
ZXBM2004
Document number: DS33433 Rev. 5 - 2
1 of 19
www.diodes.com
February 2012
© Diodes Incorporated
ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
Typical Application Circuit
NEW PRODUCT
Pin Descriptions
Pin Name
H+
H-
ThRef
SPD
C
PWM
Description
Hall input to non-inverting input of internal operational amplifier
Hall input to inverting input of internal operational amplifier
Reference output voltage
Speed control pin; The control signal voltage should be between 3V to 1V for 0% to 100% (full speed)
speed control
PWM frequency setting pin: Connect a capacitor from this pin to ground (0V) to set PWM frequency.
Capacitor of 0.1nF will give PWM frequency of 24kHz typical.
Minimum speed setting pin: Voltage between 3V to 1V on this pin sets the minimum speed
between 0% to full speed. Lowest minimum speed achieved depends on the motor coil
design.
Supply return ground pin
Rotor lock detect and auto re-start timing pin: Connect a capacitor from this pin to ground to set the lock
detect and restart timing.
Rotor lock detect pin: Open collector output to indicate rotor lock detection
Connect a pull-up resistor from the pin to the pull-up supply rail
Frequency Generator output to provide a tachometer signal
Phase-1 low-side external power switch drive output pin: Darlington emitter follower output with active
pull down to give source/sink current of 80mA/16mA
Phase-2 low-side external power switch drive output pin: Darlington emitter follower output with active
pull down to give source/sink current of 80mA/16mA
Phase output supply voltage pin: The pin allows to optimize the supply to output drive depending on
whether external power switch is Bipolar switch or MOSFET
Power supply pin
S
MIN
GND
C
LCK
RD
FG
Ph1
Ph2
V+OP
V
CC
ZXBM2004
Document number: DS33433 Rev. 5 - 2
2 of 19
www.diodes.com
February 2012
© Diodes Incorporated
ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
Functional Block Diagram
(Note 1)
D2
NEW PRODUCT
Supply Voltage
D1
V
CC
ThRef
Vref
V+OP
Set Phase Drive
Current Limit
L1
L2
C
PWM
PWM Osc
Vcc
V
SPD
Speed Control Voltage
Ph1 Lo
SPD
Phase
Drive &
Control
Vcc
SMIN
Set Min
Speed
Ph2 Lo
C
LCK
Locked
Rotor
Detect
RD
Speed &
Lock
Detect
FG
Vcc
Hall Bias
H+
Hall
H-
Hall
Amp
GND
Notes:
1. The ZXBM2004 has an open-collector FG and RD. Typically a pull-up resistor of 10kΩ is recommended from FG or RD pin to the supply voltage.
ZXBM2004
Document number: DS33433 Rev. 5 - 2
3 of 19
www.diodes.com
February 2012
© Diodes Incorporated
ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
Absolute Maximum Ratings
(T
A
= 25°C, unless otherwise noted, Note 2)
Symbol
Characteristics
Supply voltage
IC input current
Power Dissipation (Note 4)
Operating ambient temperature
Storage Temperature Range
QSOP-16
U-QFN3030-16 (Note 3)
Values
-0.6 to +20
100
500
1500
-40 to +110
-55 to +150
Unit
V
mA
mW
o
o
NEW PRODUCT
V
CCMAX
I
CCMAX
P
DMAX
T
A
T
STG
Note:
C
C
2. Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability
may be affected by exposure to absolute maximum rating conditions for extended periods of time.
3. U-QFN3030-16 dissipation is based on a two-layer 2oz. copper 2”x 2” FR4 substrate PCB with thermal vias to the bottom layer.
Recommended Operating Conditions
(T
A
= 25°C)
Symbol
V
CC
T
A
Supply Voltage
Operating Temperature Range
Parameter
Conditions
Operating
Operating
Min
4.7
-40
Max
18.0
+110
Unit
V
o
C
Electrical Characteristics (
T
A
= 25°C, V
CC
= 12V
)
Symbol
I
CC
VIN
V
CM
V
OFS
I
BS
V
OH
V
OLA
V
OLB
I
OH
I
OL
I
PWMC
I
PWMD
V
THH
V
THL
F
PWM
Notes:
Characteristics
Supply Current
Hall amplifier input voltage
Hall amplifier common mode voltage
Hall amplifier input offset voltage
Hall amplifier bias current
Ph1 and Ph2 output high voltage
Ph1 and Ph2 output low voltage
Ph1 and Ph2 output low voltage
Ph1 and Ph2 output source current
Ph1 and Ph2 output sink current
C
PWM
charge current
C
PWM
discharge current
C
PWM
high threshold voltage
C
PWM
low threshold voltage
PWM frequency
Conditions
No Load (Note 4)
Diff peak to peak
Min
-
40
0.5
Typ.
5.5
Max
7.5
V
CC
-1.5
Unit
mA
mV
V
mV
nA
V
V
V
mA
mA
µA
µA
V
V
kHz
±7
400
I
OH
= 80mA
I
OH
=16mA (Note 5)
I
OH
= 50uA (Note 6)
V
CC
-2.2
Vcc -1.8
0.4
0.4
0.6
0.6
80
16
4.5
38
3
1
C
PWM
= 0.1nF
24
7.85
65
700
4. Measure with pins H+, H-, C
LCK
and C
PWM
and all other signal pins open circuit
5. Measured when opposing Phase Output is Low
6. Measured when opposing Phase Output is High
ZXBM2004
Document number: DS33433 Rev. 5 - 2
4 of 19
www.diodes.com
February 2012
© Diodes Incorporated
ZXBM2004
TWO PHASE VARIABLE SPEED
MOTOR CONTROL PRE-DRIVER
Electrical Characteristics
(cont.)
(
T
A
= 25°C, V
CC
= 12V
)
Symbol
Characteristics
ThRef reference output voltgae
ThRef output current
S
MIN
input current
SPD voltage minimum
SPD voltage maximum
SPD voltage maximum
C
LCK
charge current
C
LCK
discharge current
V
IN
= 2V, SPD=open
100% PWM drive
0% PWM drive
V
IN
= 2V
2.8
-0.25
1
3
0.8
3.8
4.6
3
1
1:12
5
I
FGOL
= 5mA
I
RDOL
= 5mA
7.5
0.5
5
0.5
mA
V
mA
V
µs
054
2
Conditions
I
OThRef
= 100µA
Min
2.88
Typ.
2.96
Max
3.10
1
-0.3
Unit
V
mA
µA
V
V
µA
µA
µA
V
V
NEW PRODUCT
V
ThRef
I
OThRef
I
ISMIN
V
SPDL
V
SPDH
I
ISPD
I
LCKC
I
LCKD
V
CLCKTHH
C
LCK
high threshold voltage
V
CLCKTHL
C
LCK
low threshold voltage
Lock condition On:Off ratio
I
FGOL
V
FGOL
I
RDOL
V
RDOL
t
CD
FG Low level output current
FG Low level output voltage
RD Low level output current
RD Low level output current
Commutation delay
ZXBM2004
Document number: DS33433 Rev. 5 - 2
5 of 19
www.diodes.com
February 2012
© Diodes Incorporated
模拟与混合信号
