LT1952 데이터 시트보기 (PDF) - Linear Technology

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LT1952

Single Switch Synchronous Forward Controller

Linear Technology 

LT1952/LT1952-1

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

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). COMP = open, FB = 1.4V, ROSC = 178k, SYNC = 0V,

SS_MAXDC = VREF, VREF = 0.1µF, SD_VSEC = 2V, BLANK = 121k, DELAY = 121k, ISENSE = 0V, OC = 0V, OUT = 1nF, VIN = 15V, SOUT =

open, unless otherwise specified.

PARAMETER

SOFT-START

SS_MAXDC Low Level: VOL

SS_MAXDC Soft-Start Reset Threshold

SS_MAXDC Active Threshold

SS_MAXDC Input Current (Soft-Start Pull-Down: Idis)

CONDITIONS

I(SS_MAXDC) = 150µA, OC = 1V

Measured on SS_MAXDC

FB = 1V, DC > 0%

SS_MAXDC = 1V, SD_VSEC = 1.4V, OC = 1V

MIN TYP MAX UNITS

0.2

V

0.45

V

0.8

V

800

µA

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 LT1952/LT1952-1 are tested under pulsed load conditions

such that TJ ≈ TA. The LT1952EGN/LT1952EGN-1 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 LT1952IGN/LT1952IGN-1 are guaranteed

over the –40°C to 125°C operating junction temperature range and the

LT1952MPGN/LT1952MPGN-1 are tested and guaranteed over the full

–55°C to 125°C operating junction temperature range. Note that the

maximum ambient temperature consistent with these specifications is

determined by specific operating conditions in conjunction with board

layout, the rated package thermal impedance and other environmental

factors.

Note 3: Rise and Fall times are measured at 10% and 90% levels.

Note 4: Guaranteed by correlation to static test.

Note 5: Each IC includes over-temperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when over-temperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 6: Guaranteed but not tested.

Note 7: Maximum recommended SYNC frequency = 500kHz.

Note 8: In applications where the VIN pin is supplied via an external RC

network from a SYSTEM VIN > 25V, an external zener with clamp voltage

VIN ON(MAX) < VZ < 25V should be connected from the VIN pin to ground.

Note 9: VIN start-up current is measured at VIN = VIN ON – 0.25V and

scaled by x 1.18 (to correlate to worst case VIN start-up current at VIN ON).

Note 10: Timing for R = 40k derived from measurement with R = 240k.

19521fe

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