LTC1871 Linear Technology, LTC1871 Datasheet - Page 32

• Manufacturer Part Number: LTC1871
• Description: Wide Input Range/ No RSENSE Current Mode Boost/ Flyback and SEPIC Controller
• Manufacturer: Linear Technology

LTC1871
TYPICAL APPLICATIO S
32
R
22k
C
C
6.8nF
C3
261k
18V to 27V Input, 28V Output, 400W 2-Phase, Low Ripple, Synchronized RF Base Station Power Supply (Boost)
1%
R4
C
47pF
C2
C
C
C
C
C
C
100pF
IN1
IN2, 3
OUT2, 4, 5
OUT1, 3, 6
VCC1, 2
C2
8.45k
1%
:
R2
C
47pF
54.9k
C1
R3
12.1k
1%
:
1%
R2
47pF
C
:
R
22k
FB2
1.10k
C
: SANYO 50MV330AX
: TAIYO YUDEN GMK325BJ225MN
C
6.8nF
1%
C1
R3
C
47pF
SANYO 50MV330AX
TAIYO YUDEN GMK325BJ225MN
TAIYO YUDEN LMK316BJ475ML
93.1k
FB1
1%
NOTE:
R1
127
127k
1. V
1%
1%
5V to 12V Input, 12V/0.2A Output SEPIC Converter with Undervoltage Lockout
R1
R4
V
IN
IN
R
150k
5%
R
150k
5%
T1
T2
UVLO
UVLO
R
60.4k
1%
–
+
1
2
3
4
5
1
2
3
4
5
T
= 4.14V
= 4.47V
RUN
I
FB
FREQ
MODE/SYNC
RUN
I
FB
FREQ
MODE/SYNC
TH
TH
U
1
2
3
4
5
EXT CLOCK
INPUT (200kHz)
RUN
I
FB
FREQ
MODE/SYNC
TH
LTC1871
LTC1871
LTC1871
D1, D2:
L1 TO L3: COILTRONICS VP1-0076 (*COUPLED INDUCTORS)
M1:
INTV
INTV
SENSE
SENSE
GATE
GATE
GND
GND
L1 TO L4: SUMIDA CEP125-5R6MC-HD
L5:
D1, D2:
M1, M2: INTERNATIONAL RECTIFIER IRLZ44NS
V
V
CC
CC
IN
IN
INTV
SENSE
GATE
GND
V
10
9
8
7
6
10
9
8
7
6
CC
MBS120T3
SILICONIX/VISHAY Si4840
IN
SUMIDA CEP125-0R3NC-ND
ON SEMICONDUCTOR MBR2045CT
10
9
8
7
6
C
4.7 F
X5R
C
4.7 F
X5R
VCC1
VCC2
C
4.7 F
10V
X5R
VCC
C
2.2 F
35V
X5R
C
2.2 F
35V
X5R
IN2
IN3
C
1 F
16V
X5R
L1
5.6 H
L3
5.6 H
IN1
+
M1
M2
R
0.007
1W
R
0.007
1W
L2
5.6 H
L4
5.6 H
S1
S2
D1
D2
C
47 F
16V
AVX
IN2
L1*
C
2.2 F
35V
X5R
OUT3
3
4.7 F
C
2.2 F
35V
X5R
•
C
M1
X5R
OUT1
16V
3
R
0.02
DC2
+
S
4.7 F
C
16V
X5R
DC1
+
C
330 F
50V
OUT4
•
C
330 F
50V
OUT2
D1
L2*
D2
+
L3*
C
330 F
OUT5
0.3 H
50V
L5*
C
330 F
50V
•
IN1
*
4
C
4.7 F
16V
X5R
OUT1
3
+
C
4.7 F
16V
X5R
1871 TA03
OUT2
3
1871 TA04
*L5, C
C
OPTIONAL SECONDARY
FILTER TO REDUCE
OUTPUT RIPPLE FROM
<500mV
OUT6
GND
V
–12V
0.4A
V
5V to 12V
V
12V
0.4A
OUT2
C
2.2 F
35V
X5R
IN
OUT1
OUT5
OUT6
ARE AN
P-P
GND
V
28V
14A
V
18V to 27V
OUT
*
IN
AND
TO <100mV
P-P