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SC4502HEVB Datasheet(PDF) 17 Page - Semtech Corporation

Part # SC4502HEVB
Description  1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start
PDF  19 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4502HEVB Datasheet(HTML) 17 Page - Semtech Corporation

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



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