LT3519IMS-1 데이터 시트보기 (PDF) - Linear Technology

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LT3519IMS-1

LED Driver with Integrated Schottky Diode

Linear Technology 

BLOCK DIAGRAM

RSENSE

LED ARRAY

11

ISP

12

ISN

s4

LT3519/LT3519-1/LT3519-2

COUT

PWM

3

PWM

10

CATHODE

D1

7

ANODE

L1

VIN

6

SW

VIN 5

CTRL

14

100mV

–+

–

+

1.1V

A1

+

R1

FB

13

R2

SHDN/UVLO

4

2.2μA

Q3

1.22V

1.22V

+

A2

–

VIN

+

–

G4

+

A3

+

ERROR

AMPLIFIER

BANDGAP

AND

BIAS

VIN

VREF

15

–

A6

+

2V

140μA

92k

Q2

NOTE: THE MAXIMUM ALLOWED Q4 COLLECTOR CURRENT IQ4 IS 2mA.

CIN

–

G1

RC

A4

RQ

+

S

CC

PWM

COMPARATOR

G3

MAIN SWITCH

DRIVER

G2

Q1

MAIN

SWITCH

RAMP

GENERATOR

OSCILLATOR

A5

FB +

1.16V –

RS

GND

1, 8, 9, 16

OPENLED

2

Q4 IQ4

3519 BD

3519fa

7

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