10

LT1930/LT1930A

TYPICAL APPLICATIO S

GND

SW

SHDN

FB

3.3V

4

51

3

D5

L1

4.7

µH

2

R1

124k

LT1930

1930/A TA11a

C5

10

µF

C4

1

µF

C1

2.2

µF

C2

0.1

µF

C6

1

µF

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

1N4148

30k

68nF

D1

D4

D3

D2

C3

0.1

µF

+

GND

SW

SHDN

FB

3.3V

4

51

3

D7

L1

4.7

µH

2

R1

113k

LT1930

1930/A TA12a

C7

10

µF

C6

1

µF

C1

2.2

µF

C2

0.1

µF

C8

1

µF

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

1N4148

30k

68nF

D1

D5

D6

D2

C3

0.1

µF

C4

0.1

µF

C5

0.1

µF

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

2ms/DIV

8V OUTPUT

5V/DIV

–8V OUTPUT

5V/DIV

23V OUTPUT

10V/DIV

2ms/DIV