Datasheet

10
LT1930/LT1930A
TYPICAL APPLICATIO S
U
GND
V
IN
SW
SHDN FB
V
IN
3.3V
4
51
3
D5
L1
4.7µH
2
R1
124k
LT1930
1930/A TA11a
C5
10µF
C4
1µF
C1
2.2µF
C2
0.1µF
C6
1µF
R2
20k
9V
200mA
–9V
10mA
18V
10mA
C1: X5R OR X7R, 6.3V
C2,C3, C5: X5R OR X7R, 10V
C4: X5R OR X7R, 25V
D1- D4: BAT54S OR EQUIVALENT
D5: MBR0520 OR EQUIVALENT
L1: PANASONIC ELT5KT4R7M
3.3V
0V
V
SS
D
SS
1N4148
R
SS
30k
C
SS
68nF
D1
D4
D3
D2
C3
0.1µF
+
GND
V
IN
SW
SHDN FB
V
IN
3.3V
4
51
3
D7
L1
4.7µH
2
R1
113k
LT1930
1930/A TA12a
C7
10µF
C6
1µF
C1
2.2µF
C2
0.1µF
C8
1µF
R2
21k
8V
220mA
–8V
10mA
23V
10mA
C1: X5R OR X7R, 6.3V
C2-C4, C7, C8: X5R OR X7R, 10V
C5: X5R OR X7R, 16V
C6: X5R OR X7R, 25V
D1- D6: BAT54S OR EQUIVALENT
D7: MBR0520 OR EQUIVALENT
L1: PANASONIC ELT5KT4R7M
3.3V
0V
V
SS
D
SS
1N4148
R
SS
30k
C
SS
68nF
D1
D5
D6
D2
C3
0.1µF
C4
0.1µF
C5
0.1µF
D3 D4
+
8V, 23V, –8V Triple Output TFT-LCD Bias Supply with Soft-Start
9V, 18V, –9V Triple Output TFT-LCD Bias Supply with Soft-Start
Start-Up Waveforms
Start-Up Waveforms
9V OUTPUT
5V/DIV
–9V OUTPUT
5V/DIV
18V OUTPUT
10V/DIV
I
L1
0.5A/DIV
2ms/DIV
8V OUTPUT
5V/DIV
–8V OUTPUT
5V/DIV
23V OUTPUT
10V/DIV
I
L1
0.5A/DIV
2ms/DIV