LT1942 Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LT1942

Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver

Linear Technology 

LT1942

BLOCK DIAGRA

SHDN

7

ONE

SHOT

PGOOD

13

SS1

11

ENABLE

1.250V

REFERENCE

SOFT-START

+

FB1 14

–

AVDD BOOST CONVERTER

COMPARATOR

–

RSQ

+

DRIVER

SW1

20

Q1

QR S

+– 28mV

Σ

RAMP-PULSE

GENERATOR

PGND14

VCC

ENABLE –150mV

REFERENCE

–

22

NFB2

6

+

1MHz

OSCILLATOR

VOFF INVERTING CONVERTER

COMPARATOR

–

RSQ

+

DRIVER

SW2

24

Q2

ENABLE

1.250V

REFERENCE

+

FB3

5–

Σ

RAMP-PULSE

GENERATOR

VON BOOST CONVERTER

COMPARATOR

–

RSQ

+

DRIVER

D2 D2

23

SW3

D3

2

3

D3

Q3

Q5

VOUT3

4

Σ

PNP

DRIVE

CTRL4

8

AGND

10

200mV

SS4

12

ENABLE

SOFT-START

90k

+

10k

FB4

–

RAMP-PULSE

GENERATOR

CT

1

DELAY

GENERATOR

9

PGND23

LED BOOST CONVERTER

40V

COMPARATOR

–

SW4

D4

19

16

D4

DRIVER

RSQ

Q4

+

LED1

18

LED2

17

Σ

Q6

Q7

RAMP-PULSE

GENERATOR

21 PGND14

15

1942BD

FB4

1942fb

9

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