LT3748(RevA) Просмотр технического описания (PDF) - Linear Technology
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LT3748 Datasheet PDF : 30 Pages
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LT3748
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum to Minimum SENSE Threshold
Ratio
l
5.2
6.6
8.2
mV/mV
SENSE Overcurrent Threshold
SENSE Input Bias Current
RREF Voltage
VC = 2.2V
VSENSE = 10mV (Note 3)
VC = 1.1V
115
130
145
mV
10
15
20
μA
1.20
1.223
1.24
V
l
1.195
1.245
V
RREF Voltage Line Regulation
RREF Pin Bias Current
TC Current into RREF
Error Amplifier Voltage Gain
5V < VIN < 100V
(Note 3)
RTC = 20k
0.005
0.025
%/V
l
35
500
nA
27.5
μA
115
V/ V
Error Amplifier Transconductance
ΔI = 10μA
155
μmhos
VC Source Current
VC Sink Current
Flyback Comparator Trip Current
Minimum GATE Off-Time
VC = 1.1V, VRREF = 0.5V
VC = 1.1V, VRREF = 2V
Current into RFB Pin, RREF = 6.04k
–45
μA
48
μA
10
μA
700
ns
Minimum GATE On-Time
250
ns
Maximum Discontinuous Off-Time
Maximum GATE Off-Time
Maximum GATE On-Time
GATE Output Rise Time
GATE Output Fall Time
GATE Output Low (VOL)
GATE Output High (VOH)
VC = 0V
VRREF = 0.5V
VSENSE = 0V
CL = 3300pF, 10% to 90%
CL = 3300pF, 10% to 90%
24
μs
55
μs
55
μs
16
ns
16
ns
0.05
V
VINTVCC – 0.05
V
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 LT3748E 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
LT3748I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3748H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3: Current flows out of the pin.
3748fa
3
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