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LTC1872 датащи(PDF) 33 Page - Linear Technology

номер детали LTC1872
подробное описание детали  Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller
PDF  36 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC1872 датащи(HTML) 33 Page - Linear Technology

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LTC1871
33
1871fe
TYPICAL APPLICATIONS
4.5V to 28V Input, 5V/2A Output SEPIC Converter with Undervoltage Lockout and Soft-Start
Soft-Start
Load Step Response at VIN = 4.5V
Load Step Response at VIN = 28V
RUN
ITH
FB
FREQ
MODE/SYNC
SENSE
VIN
INTVCC
GATE
GND
1
2
3
4
5
10
9
8
7
6
LTC1871
RT
162k
1%
C2
1μF
X5R
NOTES:
1. VIN UVLO
+ = 4.17V
VIN UVLO
– = 3.86V
2. SOFT-START dVOUT/dt = 5V/6ms
R4
49.9k
1%
R3
154k
1%
Q1
R1
115k
1%
R2
54.9k
1%
CVCC
4.7μF
10V
X5R
CIN1
2.2μF
35V
X5R
CIN2
22μF
35V
M1
D1
•
•
L1*
L2*
RC
12k
CC1
8.2nF
C1
4.7nF
CC2
47pF
R6
750Ω
R5
100Ω
COUT1
330μF
6.3V
VIN
4.5V to 28V
VOUT
5V
2A
(3A TO 4A PEAK)
GND
1871 TA02a
+
COUT2
22μF
6.3V
X5R
CDC
2.2μF
25V
X5R
×3
+
CIN1, CDC: TAIYO YUDEN GMK325BJ225MN
CIN2:
AVX TPSE226M035R0300
COUT1:
SANYO 6TPB330M
COUT2:
TAIYO YUDEN JMK325BJ226MN
CVCC:
LMK316BJ475ML
D1:
INTERNATIONAL RECTIFIER 30BQ040
L1, L2: BH ELECTRONICS BH510-1007 (*COUPLED INDUCTORS)
M1:
SILICONIX/VISHAY Si4840
Q1:
PHILIPS BC847BF
VOUT
1V/DIV
1ms/DIV
1871 TA02b
VOUT
100mV/DIV
(AC)
2.2A
0.5A
250μs/DIV
1871 TA02c
IOUT
1A/DIV
(DC)
VOUT
100mV/DIV
(AC)
2.2A
0.5A
250μs/DIV
1871 TA02d
IOUT
1A/DIV
(DC)



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