SC4503EVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4503EVB' PDF : 22 Pages View PDF
POWER MANAGEMENT
Typical Application Circuits
SC4503
D2
D3
D4
D5
OUT2
C5
0.1µF
C6
0.1µF
C7
0.1µF
26V (10mA)
C8
1µF
3.3V
3.3V
OFF ON
< 0.4V R3
RUN
17.8k
C1
4.7µF
L1
4.7µH
5
1
IN
SW
SC4503
4 SHDN/SS
FB 3
C3
56nF
GND
2
D1
10BQ015
C4
12pF
R1
309k
OUT1
9V (0.3A)
C2
4.7µF X 2
C9
0.1µF
R2
49.9k
D7
D6
OUT3
-8.5V (10mA)
C10
1µF
D2 - D7 : BAT54S
L1 : Sumida CDC5D23B-4R7M
C2: Murata GRM21BR61C475K
C1: Murata GRM188R61A105K
Figure 13(a). Triple-Output TFT Power Supply with Soft-Start
CH4
CH1
CH2
CH3
400µs/div
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 20V/div
CH3 : OUT3 Voltage, 5V/div
CH4 : RUN Voltage, 5V/div
Figure 13(b). TFT Power Supply Start-up Transient as
the RUN Voltage is Stepped from 0 to
3.3V
40µs/div
Upper Trace : Output Voltage, AC Coupled, 0.5V/div
Lower Trace : Inductor Current, 0.5A/div
Figure 13(c). Load Transient Response. IOUT1
is switched between 50mA and
350mA
2007 Semtech Corp.
19
www.semtech.com
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