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LTC1872 Datasheet(PDF) 31 Page - Linear Technology

Part # LTC1872
Description  Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1872 Datasheet(HTML) 31 Page - Linear Technology

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



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