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LT1105IN8 Datasheet(PDF) 2 Page - Linear Technology |
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LT1105IN8 Datasheet(HTML) 2 Page - Linear Technology |
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2 / 32 page  2 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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