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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 | Status | 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) | RDC max.(mΩ) | LS(µH) | VT(V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 54.9 A, 25 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Performance Rated Current54.9 A | Saturation Current @ 10%25 A | Saturation Current @ 30%50 A | DC Resistance0.67 mΩ | Self Resonant Frequency100 MHz | MaterialWE-PERM | – | – | – | – | Inductance0.47 µH | – | – | DC Resistance [1]0.704 mΩ | – | – | Size1365 | – | ||||
 | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | 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 | Inductance100 µH | Turns Ratio3:1:0.667 | Saturation Current2.4 A | – | Leakage Inductance1.5 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3748 | |||||
| WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | Input Voltage 20 - 48 V (DC) | Output Voltage 124 V | Output Current 11.3 A | Auxiliary Voltage10 V | Inductance8 µH | Turns Ratio1:1:0.42 | Saturation Current9.5 A | – | Leakage Inductance0.4 µH | Insulation Test Voltage1500 V (AC) | SizeEFD20 | IC ReferenceLT3748 | |||||
| WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | Input Voltage 20 - 48 V (DC) | Output Voltage 115 V | Output Current 13 A | Auxiliary Voltage10 V | Inductance8 µH | Turns Ratio1.5:1:0.67 | Saturation Current20 A | – | Leakage Inductance0.4 µH | Insulation Test Voltage1500 V (AC) | SizeEFD25 | IC ReferenceLT3748 |