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LT1737IGN Folha de dados(PDF) 1 Page - Linear Technology |
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LT1737IGN Folha de dados(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LT1737 1737f APPLICATIO S FEATURES DESCRIPTIO High Power Isolated Flyback Controller The LT ®1737 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 DC supply voltage. Output voltage feed- back information may be supplied by a variety of methods including a third transformer winding, the primary wind- ing or even direct DC feedback (see Applications Informa- tion). Its gate drive capability, coupled with a suitable external MOSFET and other power path components, can deliver load power up to tens of Watts. The LT1737 has a number of features not found on other isolated flyback controller 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. s Drives External Power MOSFET s Supply Voltage Range: 4.5V to 20V s Flyback Voltage Limited Only by External Components s Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required s Switching Frequency from 50kHz to 250kHz with External Capacitor s Moderate Accuracy Regulation Without User Trims s Regulation Maintained Well into Discontinuous Mode s External ISENSE Resistor s Optional Load Compensation s Optional Undervoltage Lockout s Shutdown Feature Reduces IQ to 50µA Typ s Available in 16-Pin GN and SO Packages , LTC and LT are registered trademarks of Linear Technology Corporation. s Isolated Flyback Switching Regulators s Medical Instruments s Instrumentation Power Supplies 12V-18V to Isolated 15V Converter PGND ISENSE GATE VC FB R1 0.27 Ω M1 IRFL014 T1 COILTRONICS CTX150-4 VIN VCC UVLO SGND 1737 TA01 RCMPC ROCMP MINENAB LT1737 ENDLY OSCAP tON R3 3.01k 1% C3 0.1 µF • • D1 MBRS1100 C2 33 µF + R4 7.5k VOUT = 15V IOUT = 300mA D2 BAS16 Q1 2N3906 R2 35.7k 1% C1 22 µF 150 µH 150 µH + 240k 33k 1nF 47pF 75k 150k 100k 4.7k 0.1 µF NOTE: SEE APPLICATIONS INFORMATION FOR ADDITIONAL COMPONENT SPECIFICATIONS TYPICAL APPLICATIO |
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Descrição semelhante - LT1737IGN |
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