LT1947EMSE データシートの表示（PDF） - Linear Technology
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LT1947EMSE Datasheet PDF : 12 Pages
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LT1947
U
OPERATIO
VIN
C1
2.2µF
CERAMIC
RSS
33.2k
VSS
CSS
33nF
D3
D4
L1
3.3µH
C6
0.68µF
L2
4.7µH
VIN
SW2
D1
SW1
FB1
D2
C3
220nF
R3
182k
R4
10k
VO2 LT1947
FB2
VON
SHDN CT GND
C5
10nF
R1
53.6k
R2
10k
VOFF
–8V
C4 10mA
0.68µF
CERAMIC
AVDD
8V
200mA
C2
3.3µF
CERAMIC
×2
VON
24V
10mA
VOFF
C1: TAIYO YUDEN LMK316BJ225MD
C2: TAIYO YUDEN LMK325BJ335MD ×2
C3: AVX 0.22µF 25V X7R
C4, C6: TAIYO YUDEN LMK107BJ684MA
1947 F03
D1: MBRM120LT3
D2: CMDSH-3
D3, D4: BAT54S DUAL DIODE
L1: SUMIDA CLQ4D103R3
L2: TAIYO YUDEN LB2012B4R7M
Figure 3. RSS and CSS at SHDN Pin Provide Soft-Start
VSS
5V/DIV
VON
20V/DIV
AVDD
10V/DIV
VOFF
10V/DIV
5ms/DIV
Figure 4. Start-Up Waveforms
with Soft-Start Circuit Added
1947 F04.tif
1947fa
8
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