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LT1947 Datasheet(PDF) 8 Page - Linear Technology

Part # LT1947
Description  Adjustable Output TFT-LCD Triple Switching Regulator
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1947 Datasheet(HTML) 8 Page - Linear Technology

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


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