LTC3783IDHDTR 查看數據表（PDF） - Linear Technology

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LTC3783IDHDTR

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

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Main Control Loop/Whole System

VIN

Input Voltage Range

IQ

Input Voltage Supply Current

Continuous Mode

Shutdown Mode

VRUN+

VRUN–

Rising RUN Input Threshold Voltage

Falling RUN Input Threshold Voltage

VRUN(HYST) RUN Pin Input Threshold Hysteresis

IRUN

RUN Pin Input Current

VSENSE(MAX) Maximum Current Sense Threshold

ISENSE(ON)

SENSE Pin Current (GATE High)

ISENSE(OFF)

SENSE Pin Current (GATE Low)

ISS

Soft-Start Pin Output Current

Voltage/Temperature Reference

(Note 4)

VOV/FB = 1.5V, VITH = 0.75V

VRUN = 0V

VSENSE = 0V

VSENSE = 36V

VSS = 0V

3

36

V

1.5

mA

20

µA

1.348

V

1.223 1.248 1.273

V

100

mV

5

nA

125

150

180

mV

70

µA

0.2

µA

-50

µA

VREF

Reference Voltage

1.218 1.230 1.242

V

l 1.212

1.248

V

IREF

Max Reference Pin Output Current

∆VREF/∆VIN Reference Voltage Line Regulation 3V ≤ VIN ≤ 36V

∆VREF/∆IREF Reference Voltage Load Regulation 0mA ≤ IREF ≤ 0.5mA

TMAX

Overtemperature SD Threshold Rising

THYST

Overtemperature Hysteresis

Error Amplifier

0.5

mA

0.002 0.02

%/V

0.2

1.0

%/mA

165

°C

25

°C

IOV/FB

∆VOV/FB(OV)

VOV/FB(FB)

IFBP , IFBN

VFBP – VFBN

gm

AVOL

Oscillator

OV/FB Pin Input Current

OV/FB Overvoltage Lockout Threshold VOV/FB(OV) – VOV/FB(NOM) in %, VFBP ≤ VREF

OV/FB Pin Regulation Voltage

2.5V < VFBP < 36V

Error Amplifier Input Current

0V ≤ VFBP ≤ VREF

2.5V < VFBP < 36V

Error Amplifier Offset Voltage

(Note 5)

0V ≤ VFBP ≤ VREF

2.5V < VFBP ≤ 36V (VILIM = VREF)

2.5V < VFBP ≤ 36V (VILIM = 0.123V)

Error Amplifier Transconductance

VFBP ≤ VREF

2.5V < VFBP < 36V

Error Amplifier Open-Loop Gain

1.212

–3

500

18

7

1.230

–0.4

50

100

10

1.7

14

60

1.248

3

nA

%

V

µA

µA

mV

mV

mV

mmho

mmho

V/V

fOSC

Oscillator Frequency

RFREQ = 20kΩ

Oscillator Frequency Range

250

300

350

kHz

20

1000

kHz

DMAX

fSYNC/fOSC

tSYNC(MIN)

tSYNC(MAX)

VIH(SYNC)

VHYST(SYNC)

Maximum Duty Cycle

Recommended Max SYNC Freq Ratio

SYNC Minimum Input Pulse Width

SYNC Maximum Input Pulse Width

SYNC Input Voltage High Level

fOSC = 300kHz (Note 6)

VSYNC = 0V to 5V

VSYNC = 0V to 5V

SYNC Input Voltage Hysteresis

85

90

97

%

1.25

1.3

25

ns

0.8/fOSC

ns

1.2

V

0.5

V

3783fb

3

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