LT3759H(RevB) Ver la hoja de datos (PDF) - Linear Technology

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LT3759H
(Rev.:RevB)

Wide Input Voltage Range Boost/SEPIC/Inverting Controller

Linear Technology 

LT3759

BLOCK DIAGRAM

VIN

R4 R3

+

CIN

L1

CDC

D1

L2

t FBX

R2 + COUT1

COUT2

R1

VOUT

2.5V

IS3

VC

1

CC2

RC

CC1

1.72V – A11

+

G6

– A12

–0.86V +

FBX

FBX 2

PGOOD

6

1.6V +

A1

–

+

A2

–0.8V –

Q4

G8

1.52V – A13

+

G7

– A14

–0.76V +

FREQUENCY

FOLDBACK

12

EN/UVLO

IS1

2μA

11

VIN

A10

1.22V

2.5V

IS2

10μA

Q3

BANDGAP

REFERENCE

BG INTERNAL BIAS

GENERATOR

BG_LOW

G4

UVLO INTERNAL BIAS

A8

TSD

~165˚C

VC –

+A7

G5

Q2

PWM

COMPARATOR

CURRENT

LIMIT

VIN LDO

1.2V

SR1

RQ

S

A15

2.7V

SLOPE

VISENSE

RAMP

RAMP

GENERATOR

100kHz ~ 1MHz

OSCILLATOR

–

1.25V

+A3

G1

FREQ

FOLDBACK

1.25V

+

+ A4

Q1

–

FREQ

PROG

SS

3

CSS

SYNC

5

RT

4

RT

10

DRIVE

CURRENT

LIMIT

DRIVE LDO

INTVCC 9 CVCC

DRIVER

GATE

G2

8

M1

50mV

A6

SENSE

7

A5

GND

13

RSENSE

3759 F01

Figure 1. LT3759 Block Diagram Working as a SEPIC Converter

3759fb

8

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