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X-11181-002 Datasheet(PDF) 3 Page - Linear Technology

Part No. X-11181-002
Description  Isolated No Opto-Coupler Flyback Controller
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT3798
3
3798f
ELECTRICAL CHARACTERISTICS
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
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.
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
3798I is guaranteed to meet specified performance from –40°C to 125°C
operating junction temperature range.
Note 3: Current flows out of the FB pin.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SENSE Current Limit Threshold
VIN_SENSE = 150μA
96
102
107
mV
Minimum SENSE Current Limit Threshold
VIN_SENSE = 34μA
14
mV
Minimum SENSE Current Limit Threshold
VIN_SENSE = 21μA
4
mV
SENSE Input Bias Current
Current Out of Pin, SENSE = 0V
15
μA
FB Voltage
l
1.22
1.25
1.28
V
FB voltage Line Regulation
10V < VIN < 35V
0.01
0.03
%/V
FB Pin Bias Current
(Note 3), FB = 1V
4.05
4.25
4.4
μA
FB Error Amplifier Voltage Gain
ΔVVC/ΔVFB, CTRL1=1V, CTRL2=2V, CTRL3=2V
180
V/V
FB Error Amplifier Transconductance
ΔI = 5μA
170
UMHOS
Current Error Amplifier Voltage Gain
ΔVCOMP+/ΔVCOMP–, CTRL1 = 1V, CTRL2 = 2V, CTRL3 = 2V
100
V/V
Current Error Amplifier Transconductance
ΔI = 5μA
50
UMHOS
Current Loop Voltage Gain
ΔVCTRL/ΔVSENSE,1000pF Cap from COMP+ to COMP
21
V/V
DCM Current Turn-On Threshold
Current Out of Pin
80
μA
Maximum Oscillator Frequency
COMP+ = 0.95V, VIN_SENSE = 150μA
150
kHz
Minimum Oscillator Frequency
COMP+ = 0V, VFB <VOVP
4kHz
Minimum Oscillator Frequency
COMP+ = 0V, VFB >VOVP
0.5
kHz
Backup Oscillator Frequency
20
kHz
Linear Regulator
INTVCC Regulation Voltage
No Load
9.8
10
10.4
V
Dropout (VIN-INTVCC)IINTVCC = –10mA, VIN = 10V
500
900
mV
Current Limit
Below Undervoltage Threshold
12
25
mA
Current Limit
Above Undervoltage Threshold
80
120
mA
Gate Driver
tr GATE Driver Output Rise Time
CL = 3300pF, 10% to 90%
18
ns
tf GATE Driver Output Fall Time
CL = 3300pF, 90% to 10%
18
ns
GATE Output Low (VOL)
0.01
V
GATE Output High (VOH)
INTVCC-
50mV
V




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