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LT8331 Datasheet(PDF) 15 Page - Linear Technology |
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LT8331 Datasheet(HTML) 15 Page - Linear Technology |
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15 / 30 page  LT8331 15 8331fa For more information www.linear.com/LT8331 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 ASchottkydiodeisrecommendedforusewiththeLT8331. Low leakage Schottky diodes are necessary when low quiescentcurrentisdesiredatlowloads.Thediodeleakage appears as an equivalent load at the output and should be minimized.ChooseSchottkydiodeswithsufficientreverse 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 10 ROHM BAV21W 200 200 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 TheLT8331canbeconfiguredasaflybackconverterforthe applications where the converters have multiple outputs, 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 thehighpeakcurrents,highpeakvoltagesandconsequent 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 ° ° 1 3 5 6 7 8 EN VIN INTVCC NC BIAS NC 16 14 12 11 10 9 SW1 SW2 SYNC SS RT FBX PGND GND VOUT SW VOUT PGND VIN SW 8331 F05 |
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