CXA3537EN [SONY]
Fan Motor Driver Adopting the Power-saving DDC Drive System; 风扇电机驱动器采用节能DDC驱动系统
| 型号： | CXA3537EN |
| 厂家： | 
SONY CORPORATION |
| 描述： | Fan Motor Driver Adopting the Power-saving DDC Drive System |
| 文件： | 总2页 (文件大小：36K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Fan Motor Driver Adopting the Power-saving DDC Drive System
CXA3537EN
CXA3537TN
■
Single-phase full-wave drive type fan
motor drivers
While rapid progress continues in portable information equipment
such as notebook personal computers, the associated increases
in power consumption mean that handling the heat generated has
become a critical problem.
■
■
Maximum output current: 300 mA
Power-saving drive provided by the
DDC (drive duty control) system
To contribute to solving this problem, we proposed a new motor
■
■
■
The speed of motor rotation can be
changed by tap switching
1
*
drive system, the DDC system , to reduce fan motor power con-
sumption, and developed the CXA3537EN/TN, which adopts this
system.
Low output saturation voltage for low
loss
Wide operating voltage range:
3.0 to 13.2 V
We showed experimentally that this drive system improves power
consumption by approximately 30% over conventional drive
systems.
■
■
FG outputs, thermal protection circuit
Ultrasmall package (CXA3537EN)
At the same time, we also proposed a procedure for rapidly re-
sponding to the resonant vibration problem by adding a motor
speed modification function.
*1 Patent applied for.
The CXA3537EN and CXA3537TN are
single-phase full-wave drive type fan
motor drivers.
The Speed of Motor
DDC System
Rotation can be Changed
for Power-saving Drive
The DDC system allows the speed of
motor rotation to be changed by chang-
ing the drive duty. The CXA3537EN/
TN provide two taps to switch the drive
duty, and thus one of four speeds can
be selected by switching the taps. (See
figures 3 and 4.)
While conventional single-phase full-
The CXA3537EN is provided in an
wave drive systems apply drive current
ultrasmall 12-pin VSON package, and
regardless of the rotation angle position
the CXA3537TN is provided in a 16-
of the rotor, there are ranges of rotor
pin TSSOP package. The CXA3537TN
rotation angle positions where the drive
features isolation of the drive block
torque generation efficiency with re-
power supply pins from the IC power
spect to the drive current is good, and
supply pins, and provides stable motor
there are ranges of rotor rotation angle
rotational speed control.
Low Output Saturation
Voltage for Low Loss
positions where that efficiency is poor.
(See figure 1.) The DDC system does
not apply drive current at rotation angles
where the drive torque generation effi-
ciency is low, but rather applies drive
mainly at rotation angles where the
efficiency is high. This allows power
consumption to be reduced. (See figure
2.) However, since the average drive
torque with the DDC system is lower
than that provided by conventional
single-phase full-wave drive systems,
problems, such as longer fan motor
startup times, do appear at low-speed
area. The CXA3537EN and CXA3537TN
use a conventional drive system that
provides higher torque at startup and at
low-speed area, and automatically
switch to the power-saving DDC sys-
tem in the vicinity of the fan motor rated
speed.
The CXA3537EN and CXA3537TN
adopt newly-developed low saturation
voltage transistors in the output stage.
At the same time as compensating for
the loss in average drive torque due to
the DDC system, this also reduces cir-
cuit loss.
V
O
I
C
E
We found that when we adopted
the DDC system for use with power
consumption 1.2 W small fan
motors, power consumption was
reduced to 0.8 W. Although the
average drive torque provided by
the DDC system is lower than that
provided by conventional drive
system, in our tests, the speed of
motor rotation only fell by 6%. That
means that the difference of 0.4 W
has simply been lost as heat in
earlier circuits. This is truly waste-
ful. I strongly recommend that fan
motor manufacturers adopt the
CXA3537.
Ultrasmall package
The CXA3537EN is provided in a
VSON (Very Thin Small Outline
Non-leaded package) package. It fea-
tures a mounting size of 2.7 × 3.5 mm
and a maximum mounting height of 0.9
mm. Thus this device supports the small
circuit boards used with small fan
motors. (See figure 5.)
(a) Hole signal
(a) Hole signal
The drive current is only applied
when good efficiency can be obtained.
The drive current is
always applied.
(b) Drive current
(c) Drive torque
(b) Drive current
(c) Drive torque
Rotor rotation angle
(electrical angle) [deg]
Rotor rotation angle
(electrical angle) [deg]
■ Figure 2 Operating Waveforms of a DDC System Drive
■ Figure 1 Operating Waveforms of a Conventional
Single-phase Full-wave Drive
1.4
Conventional single-phase
full-wave drive
1.2
DDC system
1.0
This system achieves a 34%
reduction in power consumption with
only a 6% drop in motor speed.
0.8
0.6
0.4
CXA3537: This device allows one
of four motor speeds to be selected
by switching the taps.
0.2
0.0
■ Figure 3 Power-saving Effects of a DDC
System Drive and Variable-speed
Function (Experimentally verified
results)
Speed of fan motor rotation [rpm]
V
CC
R2
C3
C1
C2
+0.1
–0.05
0.8
3.5
12
1
11
10
9
8
5
7
6
12
7
LOAD
CXA3537EN
2
3
4
FG
R1
GND
Open/short
Jumper selector
1
6
0.5
■ Figure 4 CXA3537EN Application Circuit
■ Figure 5 CXA3537EN Package Dimensions (Provisional)
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