LT1105_15 datasheet(2/32 Pages) LINER

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LT1103/LT1105

200kHz maximum switching frequency to achieve high

power density. Performance at switching frequencies

above 100kHz may be degraded due to internal timing

constraints associated with fully isolated flyback mode.

Included are the oscillator, control, and protection cir-

cuitry such as current limit and overvoltage lockout.

Switch frequency and maximum duty cycle are adjustable.

Bootstrap circuitry draws 200

µA for start-up of isolated

topologies. A 5V reference as well as a 15V gate bias are

available to power external primary-side circuitry. No

external current sense resistor is necessary with LT1103

because it is integrated with the high current switch. The

LT1105 brings out the input to the current limit amplifier

and requires the use of an external sense resistor.

The LT1103/LT1105 have unique features not found on

other offline switching regulators. Adaptive antisat switch

drive allows wide ranging load currents while maintaining

high efficiency. The external FET is protected from insuf-

ficient or excessive gate drive voltage with a drive detec-

tion circuit. An externally activated shutdown mode

reduces total supply current to less than 200

µA, typical for

standby operation. Fully isolated and regulated outputs

can be generated in the optional isolated flyback mode

without the need for optocouplers or other isolated feed-

back paths.

DANGEROUS AND LETHAL POTENTIALS ARE

PRESENT IN OFFLINE CIRCUITS!

BEFORE PROCEEDING ANY FURTHER, THE

READER IS WARNED THAT CAUTION MUST

BE USED IN THE CONSTRUCTION, TESTING

AND USE OF OFFLINE CIRCUITS. HIGH

VOLTAGE, AC LINE-CONNECTED POTENTIALS

ARE PRESENT IN THESE CIRCUITS. EXTREME

CAUTION MUST BE USED IN WORKING WITH

AND MAKING CONNECTIONS TO THESE

CIRCUITS. REPEAT: OFFLINE CIRCUITS

CONTAIN DANGEROUS, AC LINE-CONNECTED

HIGH VOLTAGE POTENTIALS. USE CAUTION.

ALL TESTING PERFORMED ON AN OFFLINE

CIRCUIT MUST BE DONE WITH AN ISOLATION

TRANSFORMER CONNECTED BETWEEN THE

OFFLINE CIRCUIT'S INPUT AND THE AC LINE.

USERS AND CONSTRUCTORS OF OFFLINE

CIRCUITS MUST OBSERVE THIS PRECAUTION

WHEN CONNECTING TEST EQUIPMENT TO

THE CIRCUIT TO AVOID ELECTRIC SHOCK.

REPEAT: AN ISOLATION TRANSFORMER

MUST BE CONNECTED BETWEEN THE CIRCUIT

INPUT AND THE AC LINE IF ANY TEST

EQUIPMENT IS TO BE CONNECTED.

VIN .......................................................................... 30V

VSW Output Voltage (LT1103)................................. 50V

VSW Output Current (200ns)(LT1105) ................. ±1.5A

VC, FB, OSC, SS ........................................................ 6V

ILIM (LT1105) ........................................................... 3V

0VLO Input Current ............................................... 1mA

Lead Temperature (Soldering, 10 sec.)................ 300

°C

Maximum Operating Ambient Temperature Range

LT1103C .............................................. 0

°C to 70°C

LT1105C .............................................. 0

°C to 70°C

Maximum Operating Junction Temperature Range

LT1103C ............................................. 0

°C to 100°C

LT1105C ............................................ 0

°C to 100°C

LT1105I ......................................... – 40

°C to 125°C

Storage Temperature Range ................. –65

°C to 150°C

DESCRIPTION

WAR I G!

ABSOLUTE MAXIMUM RATINGS (Note 1)

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