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

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

range, otherwise specifications are TA = 25°C. VIN = 12V, VRUN = 1.5V, VSYNC = 0V, VFBP = VREF , RT = 20k, unless otherwise specified.

SYMBOL

RSYNC

tON(MIN)

PARAMETER

SYNC Input Pull-Down Resistance

Minimum On-Time

Low Dropout Regulator

VINTVCC

UVLO

INTVCC Regulator Output Voltage

INTVCC Undervoltage Lockout

Thresholds

∆VINTVCC

∆VIN

∆VLDO(LOAD)

VDROPOUT

IINTVCC(SD)

INTVCC Line Regulation

INTVCC Load Regulation

INTVCC Dropout Voltage

Bootstrap Mode INTVCC Supply

Current in Shutdown

GATE/PWMOUT Drivers

tr(GATE)

tf(GATE)

IPK(GATE,RISE)

IPK(GATE,FALL)

VPWMIN

GATE Driver Output Rise Time

GATE Driver Output Fall Time

GATE Driver Peak Current Sourcing

GATE Driver Peak Current Sinking

PWMIN Pin Input Threshold Voltages

RPWMIN

tr(PWMOUT)

tf(PWMOUT)

IPK(PWMOUT,RISE)

IPK(PWMOUT,FALL)

PWMIN Input Pull-Up Resistance

PWMOUT Driver Output Rise Time

PWMOUT Driver Output Fall Time

PWMOUT Driver Peak Current Sourcing

PWMOUT Driver Peak Current Sinking

CONDITIONS

With Sense Resistor, 10mV Overdrive

No RSENSE Mode

VOV/FB = 1.5V

Rising INTVCC

Falling INTVCC

Hysteresis

12V ≤ VIN ≤ 36V

0 ≤ IINTVCC ≤ 10mA

VIN = 7V, IINTVCC = 10mA

VSENSE = 0V

VSENSE = 7V

CL = 3300pF (Note 7)

CL = 3300pF (Note 7)

VGATE = 0V

VGATE = 7V

Rising PWMIN

Falling PWMIN

Hysteresis

CL = 3300pF (Note 7)

CL = 3300pF (Note 7)

VPWMOUT = 0V

VPWMOUT = 7V

MIN TYP MAX UNITS

100

kΩ

170

ns

300

ns

l 6.5

1.8

–1

7

7.5

2.3

2.5

2.1

0.2

2

6

–0.1

300

500

25

15

V

V

V

V

mV/V

%

mV

µA

µA

15

ns

8

ns

0.5

A

1

A

1.6

V

0.8

V

0.8

V

100

kΩ

30

ns

16

ns

0.25

A

0.50

A

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 LTC3783E is guaranteed to meet performance specifications

over the 0°C to 85°C operating temperature range. Specifications over

the –40°C to 85°C operating temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3783I is guaranteed to meet performance specifications over the full

–40°C to 125°C operating temperature range.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • 43°C/W) for the DFN

TJ = TA + (PD • 38°C/W) for the TSSOP

Note 4: The dynamic input supply current is higher due to power MOSFET

gate charging (QG • fOSC). See Operation section.

Note 5: The LTC3783 is tested in a feedback loop which servos VFBN to

VFBP = VVREF with the ITH pin forced to the midpoint of its voltage range

(0.3V ≤ VITH ≤ 1.2V; midpoint = 0.75V).

Note 6: In a synchronized application, the internal slope compensation is

increased by 25%. Synchronizing to a significantly higher ratio will reduce

the effective amount of slope compensation, which could result in sub-

harmonic oscillation for duty cycles greater than 50%

Note 7: Rise and fall times are measured at 10% and 90% levels.

3783fb

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