LT3755 Просмотр технического описания (PDF) - Linear Technology

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LT3755

40VIN, 75VOUT LED Controllers

Linear Technology 

LT3755/LT3755-1/LT3755-2

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

Linear Regulator

INTVCC Regulation Voltage

7

7.15

7.3

V

Dropout (VIN – INTVCC)

IINTVCC = –10mA, VIN = 7V

350

mV

INTVCC Undervoltage Lockout

INTVCC Current Limit

INTVCC Current in Shutdown

Logic Inputs/Outputs

SHDN/UVLO = 0V, INTVCC = 7V

3.9

4.1

4.3

V

29

34

40

mA

8

12

µA

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)

0

50

mV

PWMOUT Output High (VOH)

INTVCC –

V

0.05

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

IVIN Drops Below 1µA

0.4

V

SHDN/UVLO Pin Bias Current Low

SHDN/UVLO = 1.15V

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 (LT3755 and LT3755-2)

200

mV

SYNC Pin Resistance to GND

LT3755-1 Only

30

kΩ

SYNC Input High

LT3755-1 Only

1.5

V

SYNC Input Low

LT3755-1 Only

0.4

V

Gate Driver

tr GATE Driver Output Rise Time

CL = 3300pF

35

ns

tf GATE Driver Output Fall Time

CL = 3300pF

35

ns

GATE Output Low (VOL)

GATE Output High (VOH)

INTVCC –

0.05

0.05

V

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 LT3755E, LT3755E-1 and LT3755E-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 LT3755I, LT3755I-1 and LT3755I-2 are

guaranteed to meet performance specifications over the –40°C to 125°C

operating junction temperature range. The LT3755H-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: For VIN below 6V, the SHDN/UVLO pin must not exceed VIN for

proper operation.

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.

Note 5: The LT3755 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.

37551fd

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