Datasheet

LT3467/LT3467A
13
3467afe
TYPICAL APPLICATIONS
9V, 18V, –9V Triple Output TFT-LCD Bias Supply with Soft-Start
GND
V
IN
SW
FB
V
IN
3.3V
D5
L1
4.7μH
R1
124k
LT3467
3467 TA06a
C5
10μF
C4
1μF
C1
2.2μF
C2
0.1μF
C6
1μF
R2
20k
9V
220mA
–9V
10mA
18V
10mA
C1: X5R OR X7R, 6.3V
C2,C3, C5, C6: X5R OR X7R, 10V
C4: X5R OR X7R, 25V
D1 TO D4: PHILIPS BAT54S OR EQUIVALENT
D5: PHILIPS PMEG 2005
L1: PANASONIC ELT5KT4R7M
SS
V
SHDN
SHDN
3.3V
0V
C7
0.1μF
D1
D4
D3
D2
C3
0.1μF
I
L1
0.5A/DIV
9V OUTPUT
5V/DIV
18V OUTPUT
10V/DIV
–9V OUTPUT
5V/DIV
2ms/DIV
3467 TA06b
Start-Up Waveforms
8V, 23V, –8V Triple Output TFT-LCD Bias Supply with Soft-Start
I
L1
0.5A/DIV
8V OUTPUT
5V/DIV
23V OUTPUT
10V/DIV
–8V OUTPUT
5V/DIV
2ms/DIV
3467 TA07b
Start-Up Waveforms
GND
V
IN
SW
SS FB
V
IN
3.3V
D7
L1
4.7μH
R1
113k
LT3467
3467 TA07a
C7
10μF
C6
1μF
C1
2.2μF
C2
0.1μF
C8
1μF
R2
21k
8V
270mA
–8V
10mA
23V
10mA
C1: X5R OR X7R, 6.3V
C2 TO C4, C7, C8: X5R OR X7R, 10V
C5: X5R OR X7R, 16V
C6: X5R OR X7R, 25V
D1 TO D6: PHILIPS BAT54S OR EQUIVALENT
D7: PHILIPS PMEG 2005
L1: PANASONIC ELT5KT4R7M
3.3V
0V
C9
0.1μF
D1
D5
D6
D2
C3
0.1μF
C4
0.1μF
C5
0.1μF
D3 D4
SHDN
V
SHDN