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IC-Hersteller ADI Power by Linear

ADI Power by Linear LT3748 | Demoboard DC1745A

100V Isolated Flyback Converter

Details

TopologieSperrwandler
Eingangsspannung100-400 V
Ausgang 115 V / 0.6 A
Ausgang 215 V / 3 A
Ausgang 312 V / 3.5 A
Ausgang 448 V / 0.2 A
Ausgang 55 V / 2 A
IC-Revision2

Beschreibung

Demonstration circuit 1745A is an isolated flyback converter featuring the LT3748 controller for high input voltage applications. It is designed for a 15V output at up to 3A from a 100V to 400V DC input. The part senses the isolated output voltage from the third winding of the flybacktransformer during the off time of the power switch. No opto-coupler or signal transformer is required for regulation.

A minimum load of approximately 150mA is required on the output of the circuit to maintain regulation. Optionally, the demo circuit can be powered from a universal offline input (85V~265V, 50/60Hz) using the ACinput terminals. Provisions for an EMI filter and surge protection are provided in the demo circuit. The EMI filter is designed to meet the EN55022 Class B standard. The table below summarizes the performance.

The demo circuit can be easily modified for applications requiring different output voltages/currents from either an AC or DC input. Some pre-designed EFD25, EF16, and EF25 transformers from vendors such as WürthElectronics, Sumida, Pulse Engineering and Coilcraft can be assembled on the board. Some of these transformers are listed in Table 1.

The LT3748 is a high input voltage isolated flyback controller that eliminates the need for an optocoupler and secondary-side reference voltage, all while maintaining isolation between the primary and secondary-side withonly one part, the transformer, having to cross the isolation barrier. The LT3748 is well suited for a wide variety of industrial, automotive, medical, telecom, datacom applications, where regulated isolated output is required.The LT3748 datasheet gives a complete description of the part, operation and application information. The datasheet should be read in conjunction with this quick start guide for Demonstration Circuit 1745A before powering the demo circuit.

Eigenschaften

Remarks:Table 1. Pre-Designed Transformers for High Voltage Applications with LT3748Refer page no.2

Weiterführende Informationen

Artikeldaten

Artikel Nr. Daten­blatt Simu­lation Downloads ProduktserieVinVOut1
(V)
IOut1
(A)
Vaux
(V)
L
(µH)
nISAT 1
(A)
LS
(µH)
VT
(V (AC))
BauformIC-Referenz Muster
750311771SPEC
7 Dateien WE-FB Sperrwandlerübertrager geeignet für LT3573/ LT3574/ LT3575/ LT3748 100 - 400 V (DC) 15 3 15 500 3:3:1:1 2.5 10 2000 EFD25 LT3748
750811050SPEC
Flyback Transformer WE-FB
7508110117SPEC
Flyback Transformer WE-FB
7508110313SPEC
Flyback Transformer WE-FB
Artikel Nr. Daten­blatt Simu­lation
750311771SPEC
750811050SPEC
7508110117SPEC
7508110313SPEC
Muster
Artikel Nr. Daten­blatt Simu­lation Downloads ProduktserieVinVOut1
(V)
IOut1
(A)
Vaux
(V)
L
(µH)
nISAT 1
(A)
LS
(µH)
VT
(V (AC))
BauformIC-Referenz Muster