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LTC1775CS bảng dữ liệu(PDF) 19 Page - Linear Technology

tên linh kiện LTC1775CS
Giải thích chi tiết về linh kiện  High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator
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LTC1775CS bảng dữ liệu(HTML) 19 Page - Linear Technology

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19
LTC1775
Figure 11. 5V/10A Fixed Output from Design Example
A short circuit to ground will result in a folded back
current of:
I
mV
V
s
H
A
SC =
Ω
+ 


µ
µ
=
80
0 013
1 1
1
2
15
0 5
6
62
(.
)( . )
()( .
)
.
with a typical value of RDS(ON) and ρ(50°C) = 1.1. The
resulting power dissipated in the bottom MOSFET is:
P
VV
V
AW
BOT =Ω =
15
5
15
6 2
11 0013
0 37
2
–
(.
) ( . )(.
)
.
which is less than under full load conditions.
CSS
0.1
µF RC
10k
CC1
2.2nF
CC2
220pF
M1
SUD50N03-10
CIN
22
µF
30V
×4
VOUT
5V
10A
M2
SUD50N03-10
D1
MBRS340
DB
CMDSH-3
CVCC
4.7
µF
1775 F11
VIN
TK
EXTVCC
LTC1775
SYNC
VPROG
SW
TG
BOOST
INTVCC
BG
RUN/SS
FCB
ITH
SGND
VOSENSE
PGND
1
VOUT
2
3
4
5
INTVCC
6
7
8
16
15
14
13
12
11
10
9
CB
0.33
µF
RF
1
Ω
VIN
6V TO 22V
L1
6
µH
+
+
CF
0.1
µF
+
COUT
680
µF
6.3V
+
CIN: SANYO 30SC22M
COUT: SANYO 6SP680M
L1: MAGENTICS 55380-A2, 8 TURNS, 15 GAUGE
CIN is chosen for an RMS current rating of at least 5A at
temperature. COUT is chosen with an ESR of 0.013Ω for
low output ripple. The output ripple in continuous mode
will be highest at the maximum input voltage and is
approximately:
∆VO = (∆IL(MAX))(ESR) = (4.3A)(0.013Ω) = 56mV
The complete circuit is shown in Figure 11.
APPLICATIO S I FOR ATIO



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