cxa3537en Sony Electronics, cxa3537en Datasheet

cxa3537en

Manufacturer Part Number

cxa3537en

Description

Fan Motor Driver Adopting The Power-saving Ddc Drive System

Manufacturer

Sony Electronics

Datasheet

1.CXA3537EN.pdf (2 pages)

Current page: 1 of 2
Download datasheet (23Kb)

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.

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.

, 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

Related parts for cxa3537en

cxa3537en Summary of contents

Page 1

... To contribute to solving this problem, we proposed a new motor * 1 drive system, the DDC system , 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 ...

Page 2

... GND 1 6 0.5 Figure 5 CXA3537EN Package Dimensions (Provisional) The drive current is only applied when good efficiency can be obtained. Rotor rotation angle (electrical angle) [deg] Figure 3 Power-saving Effects of a DDC System Drive and Variable-speed Function (Experimentally verified results) +0.1 0.8 ...

Related keywords

cxa3537en datasheet
cxa3537en data sheet
cxa3537en pdf datasheet
cxa3537en component
cxa3537en part
cxa3537en distributor
cxa3537en RoHS
cxa3537en datasheet download