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LT8331 Datasheet(HTML) 15 Page - Analog Devices

Part No. LT8331
Description  Low IQ Boost/SEPIC/Flyback/Inverting Converter with 0.5A, 140V Switch
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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LT8331 Datasheet(HTML) 15 Page - Analog Devices

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LT8331
15
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
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
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
°
°
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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