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LTC1872 Datasheet(PDF) 30 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) 30 Page - Linear Technology

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LTC1871
30
1871fe
APPLICATIONS INFORMATION
9. The DC coupling capacitor in a SEPIC converter is cho-
sen based on its RMS current requirement and must be
rated for a minimum voltage of VIN plus the AC ripple
voltage. Start with the minimum value which satisfies
the RMS current requirement and then check the ripple
voltage to ensure that it doesn’t exceed the DC rating.
IRMS(CI) IO(MAX) •
VO + VD
VIN(MIN)
= 1.5A •
12V
+ 0.5V
5V
= 2.4A
Figure 18a. 4.5V to 15V Input, 12V/2A Output SEPIC Converter
Figure 18b. SEPIC Efficiency vs Output Current
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
105k
1%
R3
1M
CVCC
4.7μF
X5R
CIN
47μF
M1
CIN, COUT1: KEMET T495X476K020AS
CDC, COUT2: TAIYO YUDEN TMK432BJ106MM
D1:
INTERNATIONAL RECTIFIER 30BQ040
D1
•
•
L1*
L2*
RC
33k
CC1
6.8nF
CC2
47pF
COUT1
47μF
20V
×2
VIN
4.5V to 15V
VOUT
12V
1.5A
(2A PEAK)
GND
1871 F018a
+
COUT2
10μF
25V
X5R
×2
L1, L2: BH ELECTRONICS BH510-1007 (*COUPLED INDUCTORS)
M1:
INTERNATIONAL RECTIFIER IRF7811W
CDC
10μF
25V
X5R
+
OUTPUT CURRENT (A)
50
55
60
90
85
80
75
70
65
95
0.001
0.1
1
10
1871 F18b
45
0.01
100
VIN = 4.5V
VIN = 15V
VIN = 12V
VO = 12V
MODE = INTVCC
For this design a single 10μF, low ESR (X5R) Taiyo Yuden
ceramic capacitor (TMK432BJ106MM) is adequate.



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