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參數(shù)資料
| 型號(hào)： | CXA3537TN |
| 廠商： | Sony Corporation |
| 英文描述： | Fan Motor Driver Adopting the Power-saving DDC Drive System |
| 中文描述： | 風(fēng)扇電機(jī)驅(qū)動(dòng)器采用了節(jié)電DDC的驅(qū)動(dòng)系統(tǒng) |
| 文件頁(yè)數(shù)： | 1/2頁(yè) |
| 文件大?。?/td> | 36K |
| 代理商： | CXA3537TN |
Fan Motor Driver Adopting the Power-saving DDC Drive System
CXA3537EN
CXA3537TN
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.
To contribute to solving this problem, we proposed a new motor
drive system, the DDC system
*
1
, to reduce fan motor power con-
sumption, and developed the CXA3537EN/TN, which adopts this
system.
We showed experimentally that this drive system improves power
consumption by approximately 30% over conventional drive
systems.
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.
I
Single-phase full-wave drive type fan
motor drivers
I
Maximum output current: 300 mA
I
Power-saving drive provided by the
DDC (drive duty control) system
I
The speed of motor rotation can be
changed by tap switching
I
Low output saturation voltage for low
loss
I
Wide operating voltage range:
3.0 to 13.2 V
I
FG outputs, thermal protection circuit
I
Ultrasmall package (CXA3537EN)
*
1 Patent applied for.
The CXA3537EN and CXA3537TN are
single-phase full-wave drive type fan
motor drivers.
The CXA3537EN is provided in an
ultrasmall 12-pin VSON package, and
the CXA3537TN is provided in a 16-
pin TSSOP package. The CXA3537TN
features isolation of the drive block
power supply pins from the IC power
supply pins, and provides stable motor
rotational speed control.
DDC System
for Power-saving Drive
While conventional single-phase full-
wave drive systems apply drive current
regardless of the rotation angle position
of the rotor, there are ranges of rotor
rotation angle positions where the drive
torque generation efficiency with re-
spect to the drive current is good, and
there are ranges of rotor rotation angle
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 Speed of Motor
Rotation can be Changed
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.)
Low Output Saturation
Voltage for Low Loss
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.
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.)
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.
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