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參數(shù)資料
| 型號： | LTC3770EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Controller with Margining, Tracking and PLL |
| 中文描述： | 4 A SWITCHING CONTROLLER, PDSO28 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 302K |
| 代理商： | LTC3770EG |
21
LTC3770
3770f
To set a
±
25% margining, select the resistors R3, R4 such
that
V
REFIN
= 0.6
±
25% 0.6
or
1 18
.
3
4
25
%0 6
R
R
=
R4
≈
8R3
Choose R3 to be 10k, R4 to be 82k for this application.
PC Board Layout Checklist
When laying out a PC board follow one of two suggested
approaches. The simple PC board layout requires a dedi-
cated ground plane layer. Also, for higher currents, it is
recommended to use a multilayer board to help with heat
sinking power components.
The ground plane layer should not have any traces and
it should be as close as possible to the layer with power
MOSFETs.
Place C
IN
, C
OUT
, MOSFETs, D1 and inductor all in one
compact area. It may help to have some components on
the bottom side of the board.
Use an immediate via to connect the components to
ground plane including SGND and PGND of LTC3770.
Use several bigger vias for power components.
Use compact plane for switch node (SW) to improve
cooling of the MOSFETs and to keep EMI down.
Use planes for V
IN
and V
OUT
to maintain good voltage
filtering and to keep power losses low.
Flood all unused areas on all layers with copper. Flood-
ing with copper will reduce the temperature rise of
power component. You can connect the copper areas to
any DC net (V
IN
, V
OUT
, GND or to any other DC rail in
your system).
Figure 12. Design Example: 2.5V/10A at 450kHz
3770 F12
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
RUN
V
ON
PGOOD
V
RNG
V
FB
I
TH
SGND
MARGIN1
MARGIN0
I
ON
V
REFIN
V
REFOUT
MPGM
TRACK/SS
RUN
FCB
Z0
BOOST
TG
SW
PGND
BG
INTV
CC
Z1
Z2
Z
VIN
V
IN
PLLIN
PLLFLTR
INTV
CC
5V
LTC3770EG
L1: SUMIDA CEP125-1R8MC-H
C
OUT
: CORNELL DUBILIER ESRE181E04B
C
IN
: UNITED CHEMICON THCR60E1H106ZT
R6
11k
R5
39k
R
C
20k
R3
10k
R2
95.3k
R
ON
75k
R4
82k
R
PG
100k
CC1
500pF
CC2
100pF
C
SS
0.1
μ
F
CV
CC
10
μ
F
CV
IN
0.1
μ
F
DB
CMDSH-3
D1
B340A
+
C
OUT3
23
μ
F
x5R
x2
C
OUT1-2
180
μ
4V
x2
V
2.5V
10A
V
5V TO 28V
+
C
IN
10
μ
F
50V
x3
CB
0.22
μ
F
M1
Si4884
L1
1.8
μ
H
M2
Si4874
+
R1
30.1k
R8
51k
R7
47k
APPLICATIU
W
U
U
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