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LT1725IGN データシート(PDF) 1 Page - Linear Technology |
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LT1725IGN データシート(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LT1725 1725f LT1725 3VOUT FB SFST VC OSCAP tON ENDLY MENAB ROCMP RCMPC VCC UVLO GATE ISENSE SGND PGND 1nF 0.1 µF 47pF 51k 51k 51k 2.7k 35.7k 1% 3.01k 1% + 15 µF 150 µF 1 µF 1.5 µF 47k 820k 100pF 33k 68 Ω 150pF 22 Ω BAS16 VIN 36V TO 72V + IRF620 6 1 2 4 9 10 12 11 18 Ω 51 Ω 1W 470pF 12CWQ06 VOUT = 5V IOUT = 0 to 2A CTX02-14989 1725 TA01a 0.18 Ω FEATURES DESCRIPTIO TYPICAL APPLICATIO APPLICATIO S General Purpose Isolated Flyback Controller The LT ®1725 is a monolithic switching regulator control- ler specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a third transformer winding. These features allow for an application input voltage limited only by external power path components. The third transformer winding also provides output voltage feedback informa- tion, such that an optoisolator is not required. Its gate drive capability coupled with a suitable external MOSFET can deliver load power up to tens of watts. The LT1725 has a number of features not found on most other switching regulator ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regu- lation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft- start function. A 3V output is available at up to several mA for powering primary side application circuitry. s Drives External Power MOSFET with External ISENSE Resistor s Application Input Voltage Limited Only by External Power Components s Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required s Accurate Regulation Without User Trims s Regulation Maintained Well into Discontinuous Mode s Switching Frequency from 50kHz to 250kHz with External Capacitor s Optional Load Compensation s Optional Undervoltage Lockout s Available in 16-Pin SO and SSOP Packages , LTC and LT are registered trademarks of Linear Technology Corporation. s Telecom Isolated Converters s Offline Isolated Power Supplies s Instrumentation Power Supplies Output Load Regulation 48V to Isolated 5V Converter ILOAD (A) 0 5.00 1725 F10b 4.75 0.5 1.0 1.5 2.0 5.25 VIN = 36V VIN = 72V VIN = 48V |
同様の部品番号 - LT1725IGN |
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同様の説明 - LT1725IGN |
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