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Overview
| Topology | Flyback Converter |
| Input voltage | 10-15 V |
| Output 1 | 52.5 V / 0.7 A |
| IC revision | 3 |
Description
Demonstration circuit 1860A is an isolated flyback converter featuring LT3748. The demo circuit is designed for Power Sourcing Equipment (PSE) applications with a 52.5V output from a 10V to 15V DC input, with nominalinput voltage of 12V. The output current is from 0mA to 700mA, and capable of maximum short period overload current of 900mA. Table 1 summarizes the performance of the demo board. The demo circuit can be easily modifiedfor different PSE applications with some pre-designed transformers.
The LT3748 is a high input voltage isolated flyback controller operating with input supply voltages from 5V to 100V, and 1.9A average gate drive source and sink current. The LT3748 utilizes boundary mode operation to provide a high efficiency, small size solution with improved regulation.The part senses the isolated output voltage directly from the primary side flyback waveform during the off time of the power switch. No third winding, opto-coupler, or signal transformer is required for regulation.
The LT3748 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1860A.
Features
Remarks:L1=0.47uH L2(OPT)=47uHL1=1.8uH And Transformer T1 Used
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | L (µH) | n | ISAT (A) | LS (µH) | VT (V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744355147 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 54.9 | 25 | 50 | 0.67 | 100 | WE-PERM | – | – | – | – | 0.47 | – | – | – | – | 1365 | – | ||
 | 750311456 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | 36 V (DC) | 12 | 1 | 8 | 100 | 3:1:0.667 | 2.4 | 1.5 | 2500 | EP13 | LT3748 | ||
| 750311604 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | 20 - 48 V (DC) | 24 | 1.3 | 10 | 8 | 1:1:0.42 | 9.5 | 0.4 | 1500 | EFD20 | LT3748 | ||
| 750311591 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | – | – | – | 20 - 48 V (DC) | 15 | 3 | 10 | 8 | 1.5:1:0.67 | 20 | 0.4 | 1500 | EFD25 | LT3748 |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | L (µH) | n | ISAT (A) | LS (µH) | VT (V (AC)) | Size | IC Reference | Samples |
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