LT8331 datasheet(15/30 Pages) AD

15 / 30 page

LT8331

Rev. C

For more information www.analog.com

tantalum or electrolytic capacitor at the output. Low noise

ceramic capacitors are also available.

Table 3. Ceramic Capacitor Manufacturers

Taiyo Yuden

(408) 573-4150

www.t-yuden.com

AVX

(803) 448-9411

www.avxcorp.com

Murata

(714) 852-2001

www.murata.com

BOOST CONVERTER: DIODE SELECTION

A Schottky diode is recommended for use with the LT8331.

Low leakage Schottky diodes are necessary when low

quiescent current is desired at low loads. The diode leak-

age appears as an equivalent load at the output and should

be minimized. Choose Schottky diodes with sufficient

reverse voltage ratings for the target applications.

Table 4. Recommended Schottky Diodes

PART NUMBER

AVERAGE

FORWARD

CURRENT

(mA)

REVERSE

VOLTAGE

(V)

REVERSE

CURRENT

(µA)

MANUFACTURER

DFLS1100

1000

100

1.0

Diodes, Inc.

RB558VA150TR

500

150

0.5

ROHM

RB068L150TE25

2000

150

3.0

ROHM

RF101L2STE25

1000

200

ROHM

BAV21W

200

0.1

Vishay

APPLICATIONS INFORMATION

Figure 5. Suggested Boost Converter Layout

BOOST CONVERTER: LAYOUT HINTS

The high speed operation of the LT8331 demands careful

attention to board layout. Careless layout will result in per-

formance degradation. Figure 5 shows the recommended

component placement for a boost converter. Note the vias

under the exposed pad. These should connect to a local

ground plane for better thermal performance.

FLYBACK CONVERTER APPLICATIONS

The LT8331 can be configured as a flyback converter for

the applications where the converters have multiple out-

puts, high output voltages or isolated outputs. Figure 6

shows a simplified flyback converter.

The flyback converter has a very low parts count for mul-

tiple outputs, and with prudent selection of turns ratio,

can have high output/input voltage conversion ratios with

a desirable duty cycle. However, it has low efficiency due

to the high peak currents, high peak voltages and conse-

quent power loss.

The flyback converter can be designed to operate either

in continuous or discontinuous mode. Compared to con-

tinuous mode, discontinuous mode has the advantage of

VIN

INTVCC

BIAS

SW1

SW2

SYNC

FBX

PGND

GND

VOUT

PGND

VIN

8331 F05

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