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LTC7813 Datasheet(PDF) 31 Page - Linear Technology

Part # LTC7813
Description  Hybrid Step-Down Synchronous Controller
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC7813 Datasheet(HTML) 31 Page - Linear Technology

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LTC7821
31
Rev A
For more information www.analog.com
APPLICATIONS INFORMATION
Figure 20. A 48V to 5V, 500kHz, 25A Application
SER2011-901L
L1, 0.9µH
CFLY
10µF
50V
×6
GRM32ER71H106KA12
R1
6.04k
CBST1, 0.22µF
CBST2
0.47µF
CBST3, 1µF
CVCC
4.7µF, 16V
CIN
100µF
100V
M1
BSC027N06LS5
M2
BSC032N04LS
M3
BSC032N04LS
M4
BSC014N04LSI
R2, 1k
C6, 0.47µF
C1
0.1µF
R5
10k
R4
10k
C9
1nF
C10
0.1µF
COUT
150µF
16V
×2
16SVPC150M
1k
R3
C5
0.1µF
C7, 0.1µF
C3
10µF
R6, 68k
R7, 100k
R8, 3.3k
C11
0.22µF
VIN_SENSE
VIN
TEMP
TIMER
RUN
FREQ
HYS_PRGM
EXT_REF
FAULT
PGOOD
MODE/PLLIN
ITH
TRACK/SS
EXTVCC
VFB
ISNS+
ISNS–
PGND
INTVCC
BG2
SW3
BOOST3
TG2
MID_SENSE
MID
BOOST2
BG1
SW1
BOOST1
LTC7821
7821 F20
TG1
VIN
48V
INTVCC
VOUT
5V
25A
D1
CMDSH-4
CMDSH-4
D2
D3, CMDSH-4
INTVCC
8V
PGOOD
FAULT
C8
470pF
+
CMID
10µF
50V
×6
GRM32ER71H106KA12
+
C4
2.2µF
100V
×6
PIN NOT USED IN THIS CIRCUIT: CLKOUT
RFB1, 22.6k
RFB2
4.32k
Efficiency and Power Loss for
48V to 5V vs Load Current
VIN = 48V
VOUT = 5V
fSW = 500kHz
CCM
LOAD CURRENT (A)
1
5
9
13
17
21
25
70
73
76
79
82
85
88
91
94
97
100
0
1
2
3
4
5
6
7
8
9
10
7821 F20a



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