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Overview
| Topology | Flyback Converter |
| Input voltage | 3-40 V |
| Output 1 | 12 V / 0.8 A |
| Output 2 | 5 V / 1 A |
| Output 3 | 12 V / 0.5 A |
| Output 4 | 12 V / 0.3 A |
| Output 5 | 5 V / 2 A |
| Output 6 | 3.3 V / 1.5 A |
Description
The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or optoisolator is required for regulation. The part senses the isolated output voltage directly from the primary side flyback waveform. A 2.5A, 60V NPN power switch is integrated along with all control logic into a 16-lead TSSOP package.
The LT3575 operates with input supply voltages from 3V to 40V, and can deliver output power up to 14W with no external power switch.The LT3575 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.
The output voltage is easily set with two external resistors and the transformer turns ratio. Off the shelf transformers are available for many applications.
Features
- 3V to 40V Input Voltage Range
- 2.5A, 60V Integrated NPN Power Switch
- Boundary Mode Operation
- No Transformer Third Winding orOptoisolator Required for Regulation
- Improved Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- BIAS Pin for Internal Bias Supply and Power NPN Driver
- Programmable Soft-Start
- Programmable Power Switch Current Limit
- Thermally Enhanced 16-Lead TSSOP
Remarks:
- See page num 11 for more inductor values.
Typical applications
- Medical Isolated Power Supplies
- Automotive
- Industrial
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins | PCB/Cable/Panel | Modularity | Type | Wire Section | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | Interface Type | Variant | Gender | Mount | IR(A) | Working Voltage(V (AC)) | Packaging | VIN | VOut1(V) | IOut1(A) | Vaux(V) | L(µH) | n | IR(A) | ISAT(A) | LS(µH) | VT(V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-TBL Series 102 - 5.00 mm Horizontal Entry Modular, 2, Wire Protector | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 102 - 5.00 mm Horizontal Entry Modular | Pins2 | PCB/Cable/PanelPCB | ModularityYes | TypeHorizontal | Wire Section 22 to 14 (AWG) 0.75 to 1.5 (mm²) | – | – | – | – | – | – | – | – | – | – | MountTHT | Rated Current17.5 A | Working Voltage250 V (AC) | PackagingBox | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WR-USB Mini/Micro Connectors, 10, Micro USB 3.0 | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Mini/Micro Connectors | Pins10 | – | – | TypeHorizontal | – | – | – | – | – | – | – | – | Interface TypeType B | Variantwith Pads | GenderReceptacle | MountSMT | Rated Current1.8 A | Working Voltage30 V (AC) | PackagingTape and Reel | – | – | – | – | – | – | Rated Current1.8 A | – | – | – | – | – | |||
 | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Input Voltage 18 - 30 V (DC) | Output Voltage 112 V | Output Current 10.8 A | Auxiliary Voltage12 V | Inductance25 µH | Turns Ratio2:1:1 | – | Saturation Current2.8 A | Leakage Inductance0.5 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3573 & LT3575 | |||||
| WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Input Voltage 18 - 30 V (DC) | Output Voltage 112 V | Output Current 10.8 A | Auxiliary Voltage6 V | Inductance25 µH | Turns Ratio1:1:0.5 | – | Saturation Current2.8 A | Leakage Inductance0.5 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3573 & LT3575 | |||||
| WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Input Voltage 9 - 30 V (DC) | Output Voltage 15 V | Output Current 12 A | Auxiliary Voltage5 V | Inductance25 µH | Turns Ratio3:1:1 | – | Saturation Current2.6 A | Leakage Inductance0.43 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3573 & LT3575 | |||||
| WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Input Voltage 9 - 30 V (DC) | Output Voltage 15 V | Output Current 12 A | Auxiliary Voltage5 V | Inductance25 µH | Turns Ratio3:1:1 | – | Saturation Current2.5 A | Leakage Inductance0.25 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3573 & LT3575 & LT3748 | |||||
 | WL-SMCW SMT Mono-color Chip LED Waterclear, –, – | Downloads27 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | – | – | – | – | – | Dominant Wavelength [typ.]470 nm | Emitting ColorBlue | Peak Wavelength [typ.]465 nm | Luminous Intensity [typ.]145 mcd | Forward Voltage [typ.]3.2 V | Chip TechnologyInGaN | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | MountSMT | – | – | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | – | Size0603 | – |