Switch Mode Transformers Specifications

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General Specifications


	Topology / Configuration
	Your choices are...
	Boost		Boost or step-up transformers are used to convert a lower DC input voltage to a higher DC output voltage of the same polarity.
	Forward (Buck) Transformer		Buck or step-down converters are used to convert a higher DC input voltage to a lower DC output voltage of the same polarity. Forward converters are similar to buck-boost converters, but use a transformer to store energy and provide isolation between the input and output. The difference between flyback and forward transformers is in the way the energy transfer takes place. Flyback transformers have two distinct phases for energy storage and delivery. By contrast, forward transformers transfer energy from input-to-output in a single step.
	Flyback		Flyback transformers are a topology that uses the flyback - also known as kickback - of an inductor to convert the input voltage to the transformer at a desired output voltage. This is done by first storing the input energy (in the inductor) produced by the input voltage (this is called the charging cycle), and then transferring this energy (this is called the discharge cycle) to the output.
	Push-Pull		A transformer used in push-pull configuration circuits, such as power supplies.
	Other		Other unlisted topology types.
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	Mounting / Form Factor
	Your choices are...
	Chassis Mount		A chassis-mounted transformer has tabs to facilitate screwing it down.
	Chip Transformer		Chip transformers have a form factor of an integrated circuit (IC) chip. They are typically manufactured using thin-film technology.
	Dish / Disk Mount		A simple rubber washer and metal disk or dish secures the transformer to the chassis or board. There is usually a through-hole in the middle of the disk that allows for a screw to hold the transformer down.
	H-Frame		H-frame mounting is used in applications where high vibration or shock is present. It is an "H" shaped frame that the transformer sits on. The frame is secured to the chassis or board.
	Modular Jack		Magnetics incorporated into the RJ-45 form factor ensure high common mode noise immunity, while maintaining signal integrity.
	Pad-Mounted		Pad-mounted transformers are mounted on the ground, sitting on a concrete (or other material) pad. They are normally step-down transformers used in power distribution systems to step down the voltage from the high voltage terminals of an underground distribution system to the low voltage of the end user’s needs.
	PC / PCB Mount		Any of a variety of signal transformers mounted on PCBs. They can either be surface-mounted or through-hole configurations, using the soldering method to hold the transformers. PC-mount transformers offer a small footprint for the design engineer looking to measure sensor current or voltage on a computer board. Some applications for PC or PCB transformers include sensing current overload, ground fault detection, metering, isolated current feed-back signal in switch mode power supplies, motor current load / overload, lighting, switch controls, ultra-sound current, high resolution sonar current, and isolated bi-directional current sensor with full wave bridge.
	Other		Other unlisted, specialized, or proprietary transformer mounting techniques.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Performance Specifications


	Operating Frequency Range		The frequency range for which the transformer will meet all guaranteed specifications.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Input Voltage		The maximum primary voltage rating is the input voltage range of the transformer. Transformers for use with several nominal voltages need more than one primary winding. Enter the maximum voltage required for the application. Matching products will list all primary voltages available in addition to the maximum specified.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Output Voltage		The maximum secondary voltage rating is the output voltage range of the transformer. A transformer may provide more than one secondary voltage. Enter the maximum voltage required for the application. The matching products will list all secondary voltages available in addition to the maximum specified.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Power Rating		Power rating refers to the output power range the transformer is capable of producing.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	DCR		Direct current resistance (DCR) is the resistance of the transformer winding measured using DC current. The DCR is most often minimized in the design of a transformer and specified as a maximum rating.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Isolation / Hipot Level		Hipot (high potential) or isolation level is the maximum voltage that can be applied to the transformer without breaking the winding of the transformer or the dielectric.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

	Operating Temperature:		Full required range of ambient operating temperature.
	Search Logic:		User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.

	Encapsulated Transformers		Encapsulated transformers have a protective coating of cured plastic or other encapsulant which encloses the unit and provides weatherproofing.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

Core / Standards


	Core Type
	Your choices are...
	EE		A standard E-shape type of core with bobbin structure.
	EER		A standard E-shape type of core with bobbin structure.
	EFD		A standard E-shape type of core with bobbin structure.
	EP		A standard E-shape type of core with bobbin structure.
	ET		A standard E-shape type of core with bobbin structure.
	EPS		A standard E-shape type of core with bobbin structure.
	ETD		A standard E-shape type of core with bobbin structure.
	PQ		The PQ core is a standard core designed for high heat dissipation due to its large core surface area.
	RM		A standard type of ferrite core for transformers and inductors.
	Laminated Core		Laminated transformers, or E-I transformers, contain laminated steel cores insulated with a nonconducting material such as varnish. They are formed into a core to reduce electrical losses.
	Split Core		Split core current transformers are designed to provide a low cost method to monitoring electrical current. A unique hinge and locking snap allows attachment without interrupting the current-carrying wire.
	Toroidal Core		Toroidal transformers typically consist of copper wire wrapped around a cylindrical core. This design prevents the magnetic flux that occurs within the coil from leaking.
	Other		Other unlisted or proprietary core types.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Standards / Compliance
	Your choices are...
	RoHS Compliant		Restriction of Hazardous Substances (RoHS) is a European Union (EU) directive that requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of the following hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl and polybrominated diphenyl ether. RoHS became effective on July 1, 2006.
	ANSI		American National Standards Institute (ANSI) does not itself develop American National Standards, but it facilitates standards development by establishing consensus among qualified groups.
	CSA		Canadian Standards Association (CSA) establishes standards of safety for products and helps preserve the environment. CSA tests and certifies products for national in international companies.
	IEC		International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes international standards for all electrical, electronic, and related technologies.
	MIL-STD		The transformer satisfies U.S. military standards or specifications (MIL-SPEC). There are many testing standards associated with MIL standards.
	UL		Underwriters Laboratories Inc. (UL) is an independent, not-for-profit product safety testing and certification organization.
	TUV		TÜV Rhineland Berlin-Brandenburg appraises tests and certifies technical equipment and products according to international quality standards, and then registers those in compliance.
	VDE		The Germany-based VDE Testing & Certification Institute is accredited on a national and international level in the area of testing electrotechnical products. Testing is conducted for safety, electromagnetic compatibility, and other characteristics.
	WEEE Compliant		Waste Electrical and Electronics Equipment (WEE) is a European Union (EU) Directive that aims to encourage the reuse, recycling, and recovery of electrical and electronic equipment, and to improve the environmental impact and performance of this equipment. WEEE establishes the requirements and criteria for the collection, treatment, recycling, and recovery of this equipment. It makes producers responsible for financing these activities, and retailers and distributors must provide means for consumers to return used or obsolete equipment without charge.
	Other		Any other agency that that tests or certifies electrical, electronic, or electrotechnical products.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Switch Mode Transformers Specifications

Topology / Configuration:

Mounting / Form Factor:

Operating Frequency Range:

Input Voltage:

Output Voltage:

Power Rating:

DCR:

Isolation / Hipot Level:

Encapsulated Transformers?

Core Type:

Standards / Compliance:

Help with Switch Mode Transformers specifications: