ltc1871ems-trpbf Linear Technology Corporation, ltc1871ems-trpbf Datasheet - Page 31

• Manufacturer Part Number: ltc1871ems-trpbf
• Description: Wide Input Range, No Rsense Current Mode Boost, Flyback And Sepic Controller
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
TYPICAL APPLICATIONS
200mV/DIV
V
OUT
0.5A/DIV
(AC)
I
OUT
C
47pF
V
V
C2
IN
OUT
= 4.5V
= 12V
R
22k
37.4k
C
C
6.8nF
1%
C1
R2
C
C
C
C
12.1k
IN
OUT1
OUT2
VCC
1%
:
R1
: TAIYO YUDEN LMK316BJ475ML
: SANYO POSCAP 6TPB150M
: TAIYO YUDEN JMK316BJ106ML
50μs/DIV
SANYO POSCAP 6TPA47M
R
80.6k
1%
Figure 19. LTC1871 SEPIC Converter Load Step Response
T
2.5V to 3.3V Input, 5V/2A Output Boost Converter
1
2
3
4
5
RUN
I
FB
FREQ
MODE/SYNC
TH
Output Effi ciency at 2.5V and 3.3V Input
100
95
90
85
80
75
70
65
60
55
50
0.001
LTC1871
INTV
SENSE
GATE
GND
0.01
V
CC
IN
OUTPUT CURRENT (A)
10
9
8
7
6
D1: INTERNATIONAL RECTIFIER 30BQ015
L1: TOKO DS104C2 B952AS-1R8N
M1: SILICONIX/VISHAY Si9426
0.1
200mV/DIV
C
4.7μF
X5R
V
VCC
OUT
0.5A/DIV
(AC)
I
OUT
+
1
1871 TA01b
V
V
C
47μF
6.3V
1.8μH
IN
OUT
IN
= 15V
L1
10
= 12V
M1
D1
50μs/DIV
+
C
150μF
6.3V
×2
OUT1
1871 TA01a
C
10μF
6.3V
X5R
×2
OUT2
GND
V
2.5V to 3.3V
V
5V
2A
IN
OUT
1871 F19
LTC1871
31
1871fe