CXA3537TN SONY [Sony Corporation], CXA3537TN Datasheet

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CXA3537TN

Manufacturer Part Number
CXA3537TN
Description
Fan Motor Driver Adopting the Power-saving DDC Drive System
Manufacturer
SONY [Sony Corporation]
Datasheet
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
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.
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.
V
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.
O
I
C
*
E
1
, to reduce fan motor power con-
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.
DDC System
for Power-saving Drive
*
1 Patent applied for.
Single-phase full-wave drive type fan
motor drivers
Maximum output current: 300 mA
Power-saving drive provided by the
DDC (drive duty control) system
The speed of motor rotation can be
changed by tap switching
Low output saturation voltage for low
loss
Wide operating voltage range:
3.0 to 13.2 V
FG outputs, thermal protection circuit
Ultrasmall package (CXA3537EN)
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.)
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.
The CXA3537EN is provided in a
VSON (Very Thin Small Outline
Non-leaded package) package. It fea-
tures a mounting size of 2.7
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.)
The Speed of Motor
Rotation can be Changed
Low Output Saturation
Voltage for Low Loss
Ultrasmall package
3.5 mm

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CXA3537TN Summary of contents

Page 1

... 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 ...

Page 2

Hole signal The drive current is always applied. (b) Drive current (c) Drive torque Rotor rotation angle (electrical angle) [deg] Figure 1 Operating Waveforms of a Conventional Single-phase Full-wave Drive 1.4 1.2 DDC system 1.0 This system achieves a ...

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