1
S E M I C O N D U C T O R S
DESCRIPTION
The ZXBM1004 is a single-phase, DC brushless motor pre-driver with PWM
variable speed control suitable for fan and blower motors. The controller is
intended for applications where the fan or blower speed is controlled by an
external PWM signal, thermistor or DC voltage.
FEATURES
Compliant with external PWM speed control
Compliant with thermistor control
Minimum speed setting
Low noise
Auto restart
Built in hall amplifier
Speed pulse (FG) and lock rotor (RD) outputs
Up to 18V input voltage (60V with external regulator)
QSOP16 package
Associated application notes:-
AN41 - Thermistor control
AN42 - External PWM control
AN43 - Interfacing to the motor windings
APPLICATIONS
Mainframe and personal computer fans and blowers
Instrumentation fans
Central heating blowers
Automotive climate control
DEVICE MARKING
ZETEX
ZXBM
1004
ZXBM1004
ISSUE 4 - SEPTEMBER 2004
VARIABLE SPEED SINGLE-PHASE BLDC MOTOR CONTROLLER
DEVICE
REEL SIZE
TAPE WIDTH
QUANTITY PER REEL
ZXBM1004Q16TA
ZXBM1004Q16TC
7" (180mm)
13" (330mm)
12mm
12mm
500
2,500
ORDERING INFORMATION - QSOP16
QSOP16
ZXBM1004
S E M I C O N D U C T O R S
ISSUE 4 - SEPTEMBER 2004
2
PARAMETER
SYMBOL
LIMITS
UNIT
Supply voltage
V
CCmax
-0.6 to 20
V
Input current
I
CCmax
200
mA
Input voltage
V
IN
max
-0.5 to V
CC
+0.5
V
Output voltage
V
OUT
max
-0.5 to V
CC
+0.5
V
Power dissipation
P
Dmax
500
mW
Operating temp.
T
OPR
-40 to 110
C
Storage temp.
T
STG
-55 to 125
C
ABSOLUTE MAXIMUM RATINGS
Power Dissipation
1) Maximum allowable Power Dissipation, P
D
,
is shown plotted against Ambient Temperature,
T
A
, in the accompanying Power Derating Curve,
indicating the Safe Operating Area for the device.
2) Power consumed by the device, P
T
, can be
calculated from the equation:
P
T
= P
Q
+ P
PhHi
+ P
PhLo
where
P
Q
is power dissipated under quiescent
current conditions, given by:
P
Q
= Vcc x Icc
where Vcc is the application
device Supply Voltage
and
Icc is the maximum Supply
Current given in the Electrical
Characteristics
and
P
PhHi
is power generated due to either one of
the phase outputs Ph1Hi or Ph2Hi being
active, given by:
P
PhHi
= I
OL
x V
OL
where I
OL
is the application Ph1Hi and Ph2Hi
output currents
and
V
OL
is the maximum Low Level
Output Voltage for the Ph1Hi and
Ph2Hi outputs given in the Electrical
Characteristics
and
P
PhLo
is power generated due to either one of
the phase outputs Ph1Lo or Ph2Lo being
active, given by:
P
PhLo
= I
OH
x (V
CC
- V
OH
)
where I
OH
is the application Ph1Lo and Ph2Lo
output currents
and
Vcc is the application device Supply
Voltage
and
V
OH
is the maximum High Level
Output Voltage for the Ph1Lo and
Ph2Lo outputs given in the Electrical
Characteristics
ZXBM1004
S E M I C O N D U C T O R S
ISSUE 4 - SEPTEMBER 2004
3
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
CONDITIONS
Supply voltage
V
CC
4.7
18
V
Supply current
I
CC
6
8.5
mA
No load
(1)
Hall amp input voltage
V
IN
40
mV
diff p-p
Hall amp common mode voltage
V
CM
0.5
V
CC
-1.5
V
Hall amp input offset
V
OFS
7
mV
Hall amp bias current
I
BS
400
650
nA
Ph1Lo, Ph2Lo output high voltage
V
OH
V
CC
-2.2
V
CC
-1.8
V
I
OH
=80mA
Ph1Lo, Ph2Lo output low voltage
V
OLA
0.4
0.6
V
I
OL
=16mA
(2)
Ph1Lo, Ph2Lo output low voltage
V
OLB
0.4
0.6
V
I
OL
=50 A
(3)
Ph1Lo, Ph2Lo output source current
I
OH
-80
mA
Ph1Lo, Ph2Lo output sink current
I
OL
16
mA
Ph1Hi, Ph2Hi output low voltage
V
OL
0.5
0.7
V
I
OL
=100mA
Ph1Hi, Ph2Hi output sink current
I
OL
100
mA
C
PWM
charge current
I
PWMC
-6.2
-7.6
-9
A
C
PWM
discharge current
I
PWMD
65
80
95
A
C
PWM
high threshold voltage
V
THH
2.95
3
3.15
V
C
PWM
low threshold voltage
V
THL
0.94
1
1.11
V
PWM frequency
F
PWM
24
kHz
C
PWM
=0.1nF
ThRef voltage
V
ThRef
2.925
3.0
3.14
V
I
OThRef
=-100 A
ThRef output current
I
OThRef
-0.2
-1
mA
S
MIN
input current
I
ISMIN
-0.25
-0.5
A
Vin = 2V
SPD voltage minimum
V
SPDL
1
V
100% PWM drive
SPD voltage maximum
V
SPDH
3
V
0% PWM drive
SPD input current
I
ISPD
-0.8
-2
A
Vin = 2V
C
LCK
charge current
I
LCKC
-2
-3
A
C
LCK
discharge current
I
LCKD
0.2
0.35
A
C
LCK
high threshold voltage
V
THH
3
V
C
LCK
low threshold voltage
V
THL
1
V
Lock condition On:Off ratio
1:12
FG & RD output current
I
OL
5
mA
FG & RD low level output voltage
V
OL
0.5
V
I
OI
=5mA
ELECTRICAL CHARACTERISTICS (at T
amb
= 25C & V
CC
= 12V)
Notes:
(1) Measured with pins H+, H-, C
LCK
and C
PWM
= 0V and all other signal pins open circuit.
(2) Measured when opposing phase output is low.
(3) Measured when opposing phase output is high.
ZXBM1004
S E M I C O N D U C T O R S
ISSUE 4 - SEPTEMBER 2004
4
Block diagram
Vcc
SPD
H+
H-
Gnd
Ph1Lo
Ph2Lo
C
PWM
C
LCK
FG
ZXBM1004
QSOP16
RD
V+OP
ThRef
S
MIN
1
Ph1Hi
Ph2Hi
Pin assignments
PIN FUNCTIONAL DESCRIPTION
H+ - Hall input
H- - Hall input
The rotor position is detected by a Hall sensor, with the
output applied to the H+ and H- pins. This sensor can be
either a 4 pin 'naked' Hall device or of the 3 pin buffered
switching type. For a 4 pin device the differential Hall
output signal is connected to the H+ and H- pins. For a
buffered Hall sensor the Hall device output is attached
to the H+ pin, with a pull-up attached if needed, whilst
the H- pin has an external potential divider attached to
hold the pin at half V
cc
. When H+ is high in relation to
H-, Ph2 is the active drive.
ThRef - Network Reference
This is a reference voltage of nominal 3V. It is designed
for the ability to 'source' and therefore it will not 'sink'
any current from a higher voltage.
The total current drawn from the pin by the minimum
speed potential divider to pin S
MIN
and any voltage
setting network should not exceed 1mA at maximum
temperature.
SPD - Speed Control Input
The voltage applied to the SPD pin provides control
over the Fan Motor speed by varying the Pulse Width
Modulated (PWM) drive ratio at the Ph1Lo and Ph2Lo
outputs. The control signal takes the form of a voltage
input of range 3V to 1V, representing 0% to 100% drive
respectively.
If variable speed control is not required this pin can be
left with an external potential divider to set a fixed
speed or tied to ground to provide full speed i.e. 100%
PWM drive.
If required this pin can also be used as an enable pin.
The application of a voltage >3.0V will force the PWM
drive fully off, in effect disabling the drive.
S
MIN
- Sets Minimum Speed
A voltage can be set on this pin via a potential divider
between the ThRef and Gnd. This voltage is monitored
by the SPD pin such that it cannot rise above it. As a
higher voltage on the SPD pin represents a lower speed
it therefore restricts the lower speed range of the fan. If
this feature is not required the pin is left tied to ThRef so
no minimum speed will be set.
If the fan is being controlled from an external voltage
source onto the SPD pin then either this feature should
not be used or if it is required then a >1k
resistor
should be placed in series with the SPD pin.
C
PWM
- Sets PWM Frequency
This pin has an external capacitor attached to set the
PWM frequency for the Phase drive outputs. A
capacitor value of 0.1nF will provide a PWM frequency
of typically 24kHz.
The C
PWM
timing period (T
PWM
) is determined by the
following equation:
T
V
V
x C
I
V
V
x C
I
PWM
THH
THL
PWMC
THH
THL
PWMD
=
-
+
-
(
)
(
)
Where:
C = C
PWM
+15, in pF
V
T H H
a n d V
T H L
a r e t h e C
P W M
p i n
threshold voltages
I
PWMC
and I
PWMD
are the charge and
discharge currents in
A.
T
PWM
is in ms
ZXBM1004
S E M I C O N D U C T O R S
ISSUE 4 - SEPTEMBER 2004
5
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