LTC1695CS5 datasheet(16/20 Pages) LINER

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LTC1695

Table 4 lists some 5V brushless DC fans suitable for typical

LTC1695 fan speed control applications. Figure 5 shows

the measured I-V characteristics of these fans. For a

particular fan selection, users must determine the mini-

mum DAC output voltage code below which the fan stalls.

Most fans continue to consume current, even in a stalled

condition.

Table 4. Some 5V DC Fans’ Characteristics

Manufacturer

Part Number

Airflow Power

Size

(CFM)

(W) (L • W • H)mm3

SUNON

KDE0501PFB2-8

0.65

0.50

20 • 20 • 10

ATC

AD0205HB-G51

0.80

0.45

25 • 25 • 10

SUNON

KDE0502PFB2-8

1.70

0.60

25 • 25 • 10

SUNON

KDE0503PFB2-8

3.20

0.60

30 • 30 • 10

SUNON

KDE0535PFB2-8

4.80

0.70

35 • 35 • 10

Micronel

F41MM-005XK-9

6.10

0.70

40 • 40 • 12

DC FAN SELECTION

The LTC1695, in the 5-lead SOT-23 package, caters mainly

to 5V brushless DC fans, in spot cooling and notebook

computer applications, that consume less than 1W maxi-

mum. These applications typically require fan footprints

on the order of 4000mm3 to 20000mm3. Such fan sizes

are common and commercially available. Examples of

these miniature fans are the “Ultra-thin DC fan” and

“Extra-mini DC fan” from SUNON Inc. Models in these

series range from 17mm to 40mm in size, weigh from 4

grams to 10 grams and provides airflow densities from

0.65 CFM to 6 CFM.

Users must consider parameters like physical size

(L • W • H), airflow (CFM), power dissipation (W) and

acoustically generated noise (dBA) when choosing a fan.

Users must also evaluate the fan’s I-V characteristics

versus fan speed and the start/stall characteristics of the

fan. Other factors include mechanical considerations such

as low cost sleeve bearings or ball bearings that have

better long term reliability. Finally, users must consider if

the fan requires any input protection features such as

reverse-voltage protection. All of these factors affect the

fan’s cost.

Table 3 lists some 5V fan manufacturer’s contact informa-

tion.

Table 3. 5V DC Fan Manufacturers

Manufacturer

Address

SUNON Inc.

1075 W. Lambert Rd., Brea, CA 92821

Tel: (714)255-0208

Website: http://www.sunon.com

Advanced Technology

1280 Liberty Way, Vista, CA 92083

Company

Tel: (760)727-7430

Nidec America

152 Will Dr., Canton, MA 02021

Tel: (781)828-6216

Website: http://nidec.com

NMB Technologies Inc.

9730 Independence Ave., Chatsworth, CA 91311

Tel: (818)341-3355

Website: http://www.nmbtech.com

Micronel

1280 Liberty Way, Vista, CA 92083

Tel: (760)727-7400

Website: http://www.micronel.com

TERMINAL VOLTAGE (V)

150

125

100

1695 • F05

TA = 25°C

KDE0501PFB2-8

KDE0535PFB2-8

KDE0502PFB2-8

AD0205HB-G51

KDE0503PFB2-8

F41MM-005XK-9

Figure 5. I-V Characteristics of 5V

Brushless DC Fan Samples

APPLICATIONS INFORMATION

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