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SC2440AEVB 데이터시트(PDF) 25 Page - Semtech Corporation

부품명 SC2440AEVB
상세설명  Dual 30V Step-Down Switching Regulator with 2A Switches
PDF  28 Pages
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제조업체  SEMTECH [Semtech Corporation]
홈페이지  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2440AEVB 데이터시트(HTML) 25 Page - Semtech Corporation

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25
SC2440A
Typical Application Circuits (Continued)
C15
8.06k
SC2440A
GND
SS2
IN
SW1
FB2
ROSC
COMP2
R7
14.7k
BST1
BST2
SW2
L1
C2
0.1mF
L2
PGOOD2
SS1
PGOOD1
COMP1
FB1
C3
D1
B120
D2
B120
R9
57.6k
OUT1
2.5V/1.8A
30.1k
R21
R3
20k
R2
R1
30.1k
C7
22nF
C10
22nF
C8
5.6nF
R5
8.87k
C5
3.9nF
SYNC
L1: Coiltronic DR73
OUT2
0.8V/1.8A
C4
0.1mF
47mF
4.7mF
C1
22mF
10mH
4.7mH
C1: Murata GRM31CR70J226M
C15: Murata GRM31CR71C475M
100k
R8
C3: Murata GRM32ER70J476M
4.02k
R22
L2: Coiltronic DR73
12V ± 10%
VIN
D3
BAT54
C9
47pF
C6
47pF
D4
BAT54
Stepping Down to a Voltage Lower Than the Feedback Voltage.
(a) 400kHz 12V to 2.5V and 0.8V Step-down Converter.
R
3 is a pre-load to shunt the current from R21 and R22 before PGOOD1 releases SS2.
(b) Start-up waveform (I
OUT1 = IOUT2 = 1A).
(c) Channel 2 load regulation is slightly below that of channel 1 becauseV
FB2 is derived
from V
OUT1.
Figure 16.
(a)
4ms/div
V
PGOOD2
2V/div
V
OUT1
0.5V/div
V
OUT2
0.5V/div
(b)
V
SS2
1V/div
(c)



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