SC4501 Semtech Corporation, SC4501 Datasheet - Page 18

• Manufacturer Part Number: SC4501
• Description: 2MHz Step-Up Switching Regulator
• Manufacturer: Semtech Corporation

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POWER MANAGEMENT
Typical Application Circuits
2005 Semtech Corp.
Figure 13(b). TFT Power Supply V
D2 - D7 : BAT54S
CH3 : OUT3 Voltage, 5V/div
L1 : Cooper-Bussmann SD25-2R2
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 10V/div
CH4 : Input Voltage, 2V/div
3.3V
2.2 F
C1
CH1
CH2
CH3
CH4
4ms/div
150K
100K
R5
R6
Figure 13(a). 1.5MHz Triple-Output TFT Power Supply.
IN
8
3
47nF
C3
Start-up Transient.
SHDN
SS
IN
GND
6
4
SC4501
2.2 H
L1
ROSC
7
COMP
5
SW
7.68K
FB
R4
2
1
D2
40.2K
R3
820pF
C4
18
C5
0.1 F
D3
C9
0.1 F
10BQ015
D6
Figure 13(c). TFT Power Supply Start-up Transient as the
D1
D7
C6
0.1 F
D4
1 F
C10
OUT3
-8V (10mA)
R1
274K
49.9K
R2
SHDN Pin is stepped from 0 to 2V.
CH1 : OUT1 Voltage, 5V/div
CH2 : OUT2 Voltage, 10V/div
CH3 : OUT3 Voltage, 5V/div
CH4 : SHDN Voltage, 2V/div
C7
0.1 F
D5
OUT1
8V (0.55A)
10 F
CH1
CH2
CH3
CH4
C2
2ms/div
C8
1 F
OUT2
23V (10mA)
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SC4501