LTC3783EDHD-PBF 查看數據表（PDF） - Linear Technology

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LTC3783EDHD-PBF

PWM LED Driver and Boost, Flyback and SEPIC Controller

Linear Technology 

LTC3783

PIN FUNCTIONS

ITH (Pin 15): Error Amplifier Output/Compensation Pin. The

current comparator input threshold increases with this control

voltage, which is the output of the gm type error amplifier.

Nominal voltage range for this pin is 0V to 1.40V.

RUN (Pin 16): The RUN pin provides the user with an ac-

curate means for sensing the input voltage and program-

ming the start-up threshold for the converter. The falling

RUN pin threshold is nominally 1.248V and the comparator

has 100mV hysteresis for noise immunity. When the RUN

pin is grounded, the IC is shut down and the VIN supply

current is kept to a low value (20µA typ).

Exposed Pad (Pin 17): Ground Pin. Solder to PCB ground

for electrical contact and rated thermal performance.

BLOCK DIAGRAM

SLOPE

COMP

BIAS

VREF

FREQ

5

SYNC

6

1.9V –

+

ILIM

3

FBP

2

FBN

A

1

OV/FB

14

0.615V

V-TO-I

OSC

CLK

S

Q

R

SS_RESET

LOGIC

IVMODE

EA

OV/FB +

VREF –

–

VREF +–

1S

+

0

–

TEMP OT

OV

SENSOR

(165°C)

0.2V +

–

SLEEP

50mA

ITRIP

SS

13

IMAX

ITH

15

PWMIN

7

INTVCC

10

V-TO-I

EN

LDO

VREF

2.23V +

UV

–

BIAS AND

START-UP

VREF

4

GND

17

GATE

9

SENSE

12

0.15V

PWMOUT

8

RUN

16

VREF

VIN

11

3738 BD

3783fb

8

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