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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 (Value) (pcs) | Application | 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 | Gender | Mount | 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 691102710002 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-TBL Series 102 - 5.00 mm Horizontal Entry Modular | 2 | Wire Protector | PCB | Yes | Horizontal | 22 to 14 (AWG) 0.75 to 1.5 (mm²) | – | – | – | – | – | – | – | – | – | THT | 250 | Box | – | – | – | – | – | – | – | – | – | – | – | – | |
 | 692622030100 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-COM Micro USB 3.0 Type B Horizontal SMT | 10 | Micro USB 3.0 | – | – | Horizontal | – | – | – | – | – | – | – | – | Type B | Receptacle | SMT | 30 | Tape and Reel | – | – | – | – | – | – | 1.8 | – | – | – | – | – | |
 | 750310562 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 18 - 30 V (DC) | 12 | 0.8 | 12 | 25 | 2:1:1 | – | 2.8 | 0.5 | 1500 | EP10 | LT3573 & LT3575 | ||
| 750310563 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 18 - 30 V (DC) | 12 | 0.8 | 6 | 25 | 1:1:0.5 | – | 2.8 | 0.5 | 1500 | EP10 | LT3573 & LT3575 | ||
| 750310471 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 9 - 30 V (DC) | 5 | 2 | 5 | 25 | 3:1:1 | – | 2.6 | 0.43 | 1500 | EP10 | LT3573 & LT3575 | ||
| 750311675 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 9 - 30 V (DC) | 5 | 2 | 5 | 25 | 3:1:1 | – | 2.5 | 0.25 | 1500 | EP10 | LT3573 & LT3575 & LT3748 | ||
 | 150060BS75000 | SPEC | 25 files RAY files
| Active i| Production is active. Expected lifetime: >10 years. | WL-SMCW SMT Mono-color Chip LED Waterclear | – | – | – | – | – | – | 470 | Blue | 465 | 145 | 3.2 | InGaN | 140 | – | – | SMT | – | Tape and Reel | – | – | – | – | – | – | – | – | – | – | 0603 | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 691102710002 | SPEC | – |
| 692622030100 | SPEC | – |
| 750310562 | SPEC | |
| 750310563 | SPEC | |
| 750310471 | SPEC | |
| 750311675 | SPEC | |
| 150060BS75000 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins (Value) (pcs) | Application | 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 | Gender | Mount | 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 |
|---|