LT3799I(RevA) 查看數據表（PDF） - Linear Technology

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LT3799I
(Rev.:RevA)

Offline Isolated Flyback LED Controller with Active PFC

Linear Technology 

LT3799

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 18V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

FB Pin Bias Current

(Note 3), FB = 1V

100

600

nA

CTRL1/CTRL2/CTRL3 Pin Bias Current

CTRL/CTRL2/CTRL3 = 1V

±25

nA

Maximum SENSE Current Limit Threshold

96

100

106

mV

SENSE Input Bias Current

Current Loop Voltage Gain

CT Pin Charge Current

Current Out of Pin, SENSE = 0V

∆VCTRL/∆VSENSE, 1000pF Cap from COMP+ to COMP–

15

µA

21

V/V

10

µA

CT Pin Discharge Current

200

nA

CT Pin Low Threshold

Falling Threshold

240

mV

CT Pin High Threshold

Rising Threshold

1.25

V

CT Pin Low Hysteresis

100

mV

FB Pin High Threshold

1.22 1.25 1.29

V

DCM Current Turn-On Threshold

Maximum Oscillator Frequency

Minimum Oscillator Frequency

Back-Up Oscillator Frequency

Current Out of Pin

COMP+ = 1.2V, VIN_SENSE = 1V

COMP+ = 0V, VIN_SENSE

45

µA

300

kHz

25

kHz

20

kHz

Linear Regulator

INTVCC Regulation Voltage

Dropout (VIN – INTVCC)

Current Limit

INTVCC = –10mA; Below VIN Turn-Off Voltage

Below Undervoltage Threshold

9.8

10

10.4

V

750 1150

mV

15

25

mA

Current Limit

Above Undervoltage Threshold

80

120

mA

Gate Driver

tr GATE Driver Output Rise Time

tf GATE Driver Output Fall Time

GATE Output Low (VOL)

GATE Output High (VOH)

CL = 3300pF, 10% to 90%

CL = 3300pF, 90% to 10%

20

ns

20

ns

0.05

V

INTVCC

V

– 0.05

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 LT3799E 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

LT3799I is guaranteed to meet performance specifications from –40°C to

125°C operating junction temperature.

Note 3: Current flows out of the FB pin.

3799fa

3

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