typical Applications
550kHz SEPIC Converter Generates 24V from 15V to 30V Input
VIN
15V TO 30V
L1
• 47µH
C1
1µF
1M
VIN
SW
SHDN
FBX
CIN
2.2µF
LT8580
SYNC
VC
RT GND SS
154k
0.1µF
D1
L2
47µH
VOUT
24V
195mA (VIN = 15V)
300mA (VIN = 24V)
274k
COUT
4.7µF
12.7k
3.3nF
22pF
8580 TA06a
L1, L2: COILCRAFT 47µH MSD7342-473
D1: DIODES INC. DFLS1100
CIN: 2.2µF, 35V, 0805, X7R
COUT: 4.7µF, 35V, 1206, X7R
C1: 1µF, 100V, 0805, X7S
LT8580
Efficiency and Power Loss
(VIN = 24V)
90
1400
80
1250
70
1100
60
950
50
800
40
650
30
500
20
EFFICIENCY 350
POWER LOSS
10
200
0 50 100 150 200 250 300
LOAD CURRENT (mA)
8580 TA06b
Transient Response with 100mA to 225mA
to 100mA Output Load Step (VIN = 24V)
ISTEP
100mA/DIV
VOUT
500mV/DIV
AC-COUPLED
IL1 + IL2
500mA/DIV
100µs/DIV
8580 TA06c
For more information www.linear.com/LT8580
8580f
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