SC4502 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4502' PDF : 19 Pages View PDF
SC4502/SC4502H
POWER MANAGEMENT
Typical Application Circuits
D2
D3
D4
D5
OUT 2
C5
0.1µF
C6
0.1µF
C7
0.1µF
23V (10mA)
C8
1µF
3.3V
C1
2.2µF
L1
D1
R5
150K
R6
100K
3.3µH
8
6,7
IN
3 SHDN
SW
FB 2
SC4502
10 SS
COMP 1
GND
C3
4,5
47nF
ROSC
9
R4
7.68K
10BQ015
R3
33.2K
C9
0.1µF
C4
1.5nF
R1
274K
OUT 1
8V (0.4A)
R2
49.9K
C2
10µF
L1 : Coiltronics SD18-3R3
D2 - D7 : BAT54S
D7
D6
OUT 3
-8V (10mA)
C10
1µF
Figure 12(a). 1.5MHz Triple-Output TFT Power Supply.
CH4
CH1
CH2
CH3
4ms/div
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 10V/div
CH3 : OUT3 Voltage, 5V/div
CH4 : Input Voltage, 2V/div
Figure 12(b). TFT Power Supply V Start-up Transient.
IN
CH4
CH1
CH2
CH3
2ms/div
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 10V/div
CH3 : OUT3 Voltage, 5V/div
CH4 : SHDN Voltage, 2V/div
Figure 12(c). TFT Power Supply Start-up Transient as the
SHDN Pin is stepped from 0 to 2V.
2005 Semtech Corp.
17
www.semtech.com
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