Flyback Converter for LT3573/LT3574/LT3575/LT3748

Flyback Converter for LT3573/LT3574/LT3575/LT3748

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Würth Elektronik developed flyback transformers for the switching regulators:
LT3573EMSE#PBFLT3573EMSE#PBF, LT3574EMS#PBFLT3574EMS#PBF, LT3575EFE#PBFLT3575EFE#PBF and LT3748

More than 60 different transformers are available in stock. The demo boards impress with their simple design and the need for less components around the IC, as usual. Aging of the typical optocoupler used in isolated flyback converter designs are past now, as these switching regulators work with a primary side sensing, instead of using an optocoupler.

Würth Elektronik offers a wide variety of demo kits, which each includes a demo board. This board can be adjusted to input and output requirements by changing only two resistors and the transformer. Therefore, it’s an easy and fast customized isolated switch mode power supply.

Characteristic	Applications
Standard transformers for various output voltages/currents available Easy design of custom power supply due to standard circuit and change of transformers and two components for feedback loop Isolation voltage up to 2.5 kV Less external components needed Small board space Low cost No optocoupler needed! Long term reliability voltage control No aging Same external parts for different output voltages	PoE, Voice over IP, Communications Standby & industrial power supplies Xenon flash lamps, laser, LED lighting IGBT controller Sensitive input voltage required applications (small VP-P)

Characteristic

Applications

Standard transformers for various output voltages/currents available
Easy design of custom power supply due to standard circuit and change of transformers and two components for feedback loop
Isolation voltage up to 2.5 kV
Less external components needed
Small board space
Low cost
No optocoupler needed!
Long term reliability voltage control
No aging
Same external parts for different output voltages

PoE, Voice over IP, Communications
Standby & industrial power supplies
Xenon flash lamps, laser, LED lighting
IGBT controller
Sensitive input voltage required applications (small VP-P)

**Assembled demo boards with option to change included transformer**
Order Code*	LT IC	Demoboard	Power (W)	Transformer assembled on board Order Code
750 105	LT3574EMS#PBFLT3574EMS#PBF	DC1636A	2.5	750 370 041
750 103	LT3573EMSE#PBFLT3573EMSE#PBF	DC1228A	7	750 970 047
750 106	LT3575EFE#PBFLT3575EFE#PBF	DC1643A	10	750 311 675
750 107	LT3748	DC1557A	12	750 311 439
750 108	LT3748	DC1694A	30	750 311 607

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