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LT3798EMSE

Isolated No Opto-Coupler Flyback Controller with Active PFC

Linear Technology 

LT3798

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 18V, INTVCC = 11V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

SENSE Current Limit Threshold

Minimum SENSE Current Limit Threshold

Minimum SENSE Current Limit Threshold

SENSE Input Bias Current

VIN_SENSE = 150µA

VIN_SENSE = 34µA

VIN_SENSE = 21µA

Current Out of Pin, SENSE = 0V

96

102

107

mV

14

mV

4

mV

15

µA

FB Voltage

l 1.22 1.25 1.28

V

FB voltage Line Regulation

FB Pin Bias Current

10V < VIN < 35V

(Note 3), FB = 1V

0.01 0.03

%/V

4.05 4.25

4.4

µA

FB Error Amplifier Voltage Gain

FB Error Amplifier Transconductance

ΔVVC/ΔVFB, CTRL1=1V, CTRL2=2V, CTRL3=2V

ΔI = 5µA

180

V/V

170

UMHOS

Current Error Amplifier Voltage Gain

∆VCOMP+/∆VCOMP–, CTRL1 = 1V, CTRL2 = 2V, CTRL3 = 2V

100

V/V

Current Error Amplifier Transconductance ∆I = 5µA

50

UMHOS

Current Loop Voltage Gain

DCM Current Turn-On Threshold

ΔVCTRL/ΔVSENSE,1000pF Cap from COMP+ to COMP–

Current Out of Pin

21

V/V

80

µA

Maximum Oscillator Frequency

Minimum Oscillator Frequency

Minimum Oscillator Frequency

COMP+ = 0.95V, VIN_SENSE = 150µA

COMP+ = 0V, VFB <VOVP

COMP+ = 0V, VFB >VOVP

150

kHz

4

kHz

0.5

kHz

Backup Oscillator Frequency

20

kHz

Linear Regulator

INTVCC Regulation Voltage

Dropout (VIN-INTVCC)

Current Limit

No Load

IINTVCC = –10mA, VIN = 10V

Below Undervoltage Threshold

9.8

10

10.4

V

500

900

mV

12

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%

18

ns

18

ns

0.01

V

INTVCC-

V

50mV

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 LT3798E is guaranteed to meet specified performance from

0°C to 125°C junction temperature. Specification over the –40°C and

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

characterization and correlation with statistical process controls. The

LT3798I is guaranteed to meet specified performance from –40°C to 125°C

operating junction temperature range. The LT3798H is guaranteed to meet

performance specifications over the –40°C to 150°C operating junction

temperature range. The LT3798MP is guaranteed to meet performance

specifications over the –55°C to 150°C operating junction temperature

range. High junction temperatures degrade operating lifetimes. Operating

lifetime is derated for junction temperatures greater than 125°C.

Note 3: Current flows out of the FB pin.

3798fa

3

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