LT3743 Просмотр технического описания (PDF) - Linear Technology

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LT3743

High Current Synchronous Step-Down LED Driver with Three-State Control

Linear Technology 

LT3743

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PWMG Control Signals

CTRL_SEL High to PWMGL Low Delay

10

40

ns

CTRL_SEL High to PWMGH High Delay

150

200

ns

CTRL_SEL Low to PWMGH Low Delay

30

60

ns

CTRL_SEL Low to PWMGL High Delay

170

220

ns

PWMGH and PWMGL Pull-up Impedance

3.2

Ω

PWMGH and PWMGL Pull-Down Impedance

1.75

Ω

Current Control Loop gm Amp

Offset Voltage

Input Common Mode Range

VCM(LOW)

VCM(HIGH)

VSENSE+ = 4V, VSENSE– = 4V

VCM(HIGH) Measured from VIN to VCM

l –3

0

3

mV

0

V

2

V

Output Impedance

3.5

MΩ

gm

Differential Gain

375

475

625

1.7

µA/V

V/mV

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT3743E is guaranteed to meet performance specifications

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3743I is guaranteed to meet performance specifications over the –40°C

to 125°C operating junction temperature range.

Note 3: The minimum on and off times are guaranteed by design and are

not tested.

3743fd

4

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