LTC1174 查看數據表（PDF） - Linear Technology

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LTC1174

High Efficiency Step-Down and Inverting DC/DC Converter

Linear Technology 

LTC1174

LTC1174-3.3/LTC1174-5

APPLICATIO S I FOR ATIO

Solving for L in the above equation and with VD = 0.6V,

L = 44.8µH. The next higher standard value of L is 50µH

(example: Coiltronics CTX50-4). The operating frequency,

neglecting voltage across diode VD is:

f

≈

2.5

•

105 ⎛⎝⎜1 −

VOUT

VIN

⎞

⎠⎟

= 111kHz

With the value of L determined, the requirements for CIN

and COUT are calculated. For CIN, its RMS current rating

should be at least:

[ ( )] IRMS

= IOUT

VOUT

VIN − VOUT

VIN

1/ 2

= 174mA

(ARMS)

For COUT, the RMS current rating should be at least:

( ) IRMS

≈

IPEAK

2

A RMS

= 300mA

Now allow VIN to drop to 6V. At this minimum input voltage

the operating frequency will decrease. The new frequency

is 42kHz.

Table 1. Inductor Manufacturers

MANUFACTURER

Coilcraft

1102 Silver Lake Road

Cary, IL 60013

(708) 639-2361

Coiltronics Inc.

6000 Park of Commerce Blvd.

Boca Raton, FL 33487

(407) 241-7876

Gowanda Electronics Corporation

1 Industrial Place

Gowanda, NY 14070

(716) 532-2234

Sumida Electric Co. Ltd.

637 E. Golf Road, Suite 209

Arlington Heights, IL 60005

(708) 956-0666/7

PART NUMBER

DT3316 Series

Econo-Pac

Octa-Pac

GA10 Series

CD 54 Series

CD 75 Series

Table 2. Capacitor Manufacturers

MANUFACTURER

AVX Corporation

P.O. Box 887

Myrtle Beach, SC 29578

(803) 448-9411

Nichicon America Corporation

927 East State Parkway

Schaberg, IL 60173

(708) 843-7500

Sanyo Video Components

2001 Sanyo Avenue

San Diego, CA 92173

(619) 661-6385

Attn: Sales Dept.

PART NUMBER

TPS Series

TAJ Series

PL Series

OS-CON Series

1174fe

12

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