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Overview
| Topology | Flyback Converter |
| Input voltage | 3-40 V |
| Output 1 | 3.3 V / 4 A |
| Output 2 | 5 V / 2.4 A |
| Output 3 | 3.3 V / 3 A |
| Output 4 | 5 V / 3 A |
| Output 5 | 12 V / 1 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 | VIN | VOut1(V) | IOut1(A) | Vaux(V) | L(µH) | n | ISAT(A) | LS(µH) | VT(V (AC)) | Size | IC Reference | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 12 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 112 V | Output Current 11 A | Auxiliary Voltage8 V | Inductance50 µH | Turns Ratio3:1:0.67 | Saturation Current2.8 A | Leakage Inductance2 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3575 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 13 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio5:1:2 | Saturation Current2.25 A | Leakage Inductance1.5 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3575 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 13 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:1.5 | Saturation Current2.4 A | Leakage Inductance1.5 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3574 & LT3575 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio5:1:2 | Saturation Current3.3 A | Leakage Inductance1.2 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:2 | Saturation Current3.85 A | Leakage Inductance1.2 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:2 | Saturation Current3.7 A | Leakage Inductance1.2 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio5:1:2 | Saturation Current3.1 A | Leakage Inductance1.2 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:2 | Saturation Current3.7 A | Leakage Inductance1.2 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability |
Availability Forecast
WE item number Packaging unitsLead time
––– weeks
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |
There is no forecast for this quantity request.
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