Linear LTC1474, Демонстрационное руководство

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2
DEMO MANUAL DC143
PERFOR m A N CE SU ARY
U W W W
SYMBOL PARAMETER CONDITIONS BOARD SUFFIX VALUE
V
RIPPLE
Typical Output Ripple I
OUT
= 100mA All 50mV
∆
V
OUT
Typical Line Regulation 4V < V
IN
< 18V, R
SENSE
= 0
Ω
, I
LOAD
= 100mA A, D 35mV
4V < V
IN
< 18V, R
SENSE
= 0.25
Ω
, I
LOAD
= 100mA 25mV
4V < V
IN
< 18V, R
SENSE
= 0
Ω
, I
LOAD
= 100mA B, E 20mV
4V < V
IN
< 18V, R
SENSE
= 0.25
Ω
, I
LOAD
= 100mA 10mV
6V < V
IN
< 18V, R
SENSE
= 0
Ω
, I
LOAD
= 100mA C, F 20mV
6V < V
IN
< 18V, R
SENSE
= 0.25
Ω
, I
LOAD
= 100mA 10mV
Typical Load Regulation 0 < I
LOAD
< 300mA, R
SENSE
= 0
Ω
, V
IN
= 10V All 10mV
0 < I
LOAD
< 150mA, R
SENSE
= 0.25
Ω
, V
IN
= 10V 10mV
V
LBI
Low-Battery Trip Threshold All 1.23V
DM143 F02
V
IN
GND
SENSE
LBI/OFF LBI
ON
V
FB
LBO
LBO
SW
LTC1475
+
6
3
8
1
2
5
7
4
R7
100k RUN
SHDN
R5
C2
1000pF
C1
4.7
µ
F
35V
C5
0.1
µ
F
V
IN
4V* TO 18V
R4
R1
0.25
Ω
R6
0
Ω
R3
3.01M
R2
1M
*3.3V AT NO LOAD
C3
10pF
L1
100
µ
H
D1
MBR0530
+
C4
100
µ
F
6.3V
THIS NETWORK
IS PRESENT IN
BOARD D ONLY
V
OUT
3.3V
300mA
Figure 2. LTC1475 Demo Board Schematic
PACKAGE A D SCHE ATIC DIAGRA S M
W U W
DM143 F01
V
IN
GND
SENSE
LBI LBI
RUN
V
FB
LBO
LBO
SW
LTC1474
+
6
3
8
1
2
5
7
4
R7
100k
R5
JP1
RUN
C2
1000pF
C1
4.7
µ
F
35V
C5
0.1
µ
F
V
IN
4V* TO 18V
R4
R1
0.25
Ω
R6
0
Ω
*3.3V AT NO LOAD
C3
10pF
L1
100
µ
H
D1
MBR0530
+
C4
100
µ
F
6.3V
THIS NETWORK
IS PRESENT IN
BOARD A ONLY
V
OUT
3.3V
300mA
Figure 1. LTC1474 Demo Board Schematic
1
2
3
4 V
OUT
(V
FB
*)
LBO
LBI
GND
8
7
6
5 RUN
V
IN
SENSE
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*ADJUSTABLE OUTPUT VERSION
1
2
3
4 V
OUT
(V
FB
*)
LBO
LBI/OFF
GND
8
7
6
5 ON
V
IN
SENSE
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*ADJUSTABLE OUTPUT VERSION
LTC1474CMS8
LTC1474CMS8-3.3
LTC1474CMS8-5
LTC1475CMS8
LTC1475CMS8-3.3
LTC1475CMS8-5