LT3756 Просмотр технического описания (PDF) - Linear Technology
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LT3756 Datasheet PDF : 24 Pages
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LT3756/LT3756-1/LT3756-2
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise
noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Logic Inputs/Outputs
PWM Input High Voltage
l 1.5
V
PWM Input Low Voltage
l
0.4
V
PWM Pin Resistance to GND
45
60
kΩ
PWMOUT Output Low (VOL)
PWMOUT Output High (VOH)
0
INTVCC –
0.05
50
mV
V
SHDN/UVLO Threshold Voltage Falling
E-, I-Grades
H Grade
l 1.185 1.220 1.245
V
l 1.175
1.245
V
SHDN/UVLO Rising Hysteresis
20
mV
SHDN/UVLO Input Low Voltage
SHDN/UVLO Pin Bias Current Low
IVIN Drops Below 1µA
SHDN/UVLO = 1.15V
0.4
V
1.7
2.05
2.5
µA
SHDN/UVLO Pin Bias Current High
SHDN/UVLO = 1.30V
10
100
nA
OPENLED Output Low (VOL)
IOPENLED = 0.5mA
(LT3756 and LT3756-2)
200
mV
SYNC Pin Resistance to GND
LT3756-1 Only
30
kΩ
SYNC Input High
LT3756-1 Only
1.5
V
SYNC Input Low
LT3756-1 Only
0.4
V
Gate Driver
tr GATE Driver Output Rise Time
tf GATE Driver Output Fall Time
GATE Output Low (VOL)
GATE Output High (VOH)
CL = 3300pF
CL = 3300pF
35
ns
35
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 LT3756E, LT3756E-1 and LT3756E-2 are 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 LT3756I, LT3756I-1 and LT3756I-2 are
guaranteed to meet performance specifications over the –40°C to 125°C
operating junction temperature range. The LT3756H-2 is guaranteed to
meet performance specifications 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: The LT3756 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operating above
the specified maximum operating junction temperature may impair device
reliability.
Note 4: GATE and PWMOUT pins are driven either to GND or INTVCC by
internal switches. Do not connect these pins externally to a power supply.
375612fb
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