Design Kit Demoboard for Flyback Transformers

Flyback Converter for LT3573/LT3574/LT3575/LT3748

Linear Technologies and Würth Elektronik developed flyback transformers for the switching regulators:
LT3573, LT3574, LT3575 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.

Characteristics

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)

Application Notes

WE Order Code	LT IC	LT Spice	Demoboard	Power (W)	Transformer assembled on board Order Code	Farnell Order Code	Ouput Voltage	Transformer 2 Order Code	Farnell Order Code	Ouput Voltage	Transformer 3 Order Code	Farnell Order Code	Ouput Voltage
750105	LT3574EMS#PBFLT3574EMS#PBF		DC1636A	2.5	750370041	17486881748688	5 V / 0.35 A	750311304	18957331895733	3.3 V / 0.7 A	750310799	17486891748689	12 V / 0.15 A
750103	LT3573EMSE#PBFLT3573EMSE#PBF		DC1228A	7	750970047	-	5 V / 1 A	-	-	-	-	-	-
750106	LT3575EFE#PBFLT3575EFE#PBF		DC1643A	10	750311675	18957391895739	5 V / 1.4 A	750310564	17486861748686	12 V / 0.5 A	750310559	17486801748680	3.3 V / 1.5 A
750107	LT3748		DC1557A	12	750311439	18957531895753	12 V / 1 A	750310688	-	3.3 V / 4 A	750311689	18957561895756	5 V / 3 A
750108	LT3748		DC1694A	30	750311607	18957671895767	12 V / 2.5 A	750311599	18957631895763	15 V / 2 A	750311608	18957681895768	24 V / 1.3 A

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