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| LTC1871IMS Datasheet, PDF (31/36 Pages) Linear Technology – Current Mode Boost Flyback and SEPIC Controller | |||
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APPLICATIONS INFORMATION
VIN = 4.5V
VOUT = 12V
VOUT (AC)
200mV/DIV
VIN = 15V
VOUT = 12V
VOUT (AC)
200mV/DIV
LTC1871
IOUT
0.5A/DIV
IOUT
0.5A/DIV
50μs/DIV
50μs/DIV
1871 F19
Figure 19. LTC1871 SEPIC Converter Load Step Response
TYPICAL APPLICATIONS
2.5V to 3.3V Input, 5V/2A Output Boost Converter
L1
1.8μH
D1
1
RUN
10
SENSE
2
ITH
9
VIN
RC
LTC1871
+
22k
3
8
CC1
R1
FB
4
INTVCC
7
6.8nF 12.1k
FREQ
GATE
M1
R2 1%
CC2 37.4k
47pF
1%
RT
80.6k
1%
5
MODE/SYNC
6
GND
CVCC + CIN
4.7μF
47μF
X5R
6.3V
CIN: SANYO POSCAP 6TPA47M
COUT1: SANYO POSCAP 6TPB150M
COUT2: TAIYO YUDEN JMK316BJ106ML
CVCC: TAIYO YUDEN LMK316BJ475ML
D1: INTERNATIONAL RECTIFIER 30BQ015
L1: TOKO DS104C2 B952AS-1R8N
M1: SILICONIX/VISHAY Si9426
VIN
2.5V to 3.3V
COUT1
150μF
6.3V
Ã2
VOUT
5V
2A
COUT2
10μF
6.3V
X5R
Ã2
GND
1871 TA01a
Output Efï¬ciency at 2.5V and 3.3V Input
100
95
90
85
80
75
70
65
60
55
50
0.001
0.01
0.1
1
OUTPUT CURRENT (A)
10
1871 TA01b
1871fe
31
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