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EE14, EE16 / 7, EE1512 high frequency transformer common application and selection guide

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 structures in the field of open power supply. The two E-type cores are joined to form a closed magnetic circuit, which has simple structure, convenient winding, low cost, wide frequency range (20kHz-500kHz), and power coverage from several watts to several kilowatts.

For low–power applications (5W–20W), EE14, EE16/7, and EE1512 are the three models that engineers encounter most frequently。 They have similar sizes but different positions; if you choose them incorrectly, the result may range from reduced efficiency to core saturation—and even a complete system failure.


A snapshot of core parameters

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EE14 A compact, low–power “entry–level” solution

Typical applications:

· 5V / 1A Mobile Charger (5W classic solution)

· Intelligent home equipment auxiliary power supply (road, smart speaker, top box 12V / 0.5A-1A)

· Small appliances built-in power supply (electric toothbrush, razor, LED table lamp)

· DC-DC isolation conversion module (24 V → 5 V logic voltage)

· IGBT /MOSFETGate drive transformer


Key considerations when selecting a model :

· Power ≤ 8W Preferred, the best choice for extremely limited space scenarios

· Input 85-265VAC wide voltage, output 3.3V-12V

· Note the core saturation margin ; for flyback topologies, it is recommended that Bmax ≤ 0.3 T.

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EE16/7 A “versatile performer” for small–to–medium power levels

Typical applications:

· 5V / 2A USB charging device (10 W solution)

· 12V / 1A Adapters (Wayfarer, Surveillance Camera)

· Auxiliary power supply for large household appliances (air conditioning, washing machine MCU power supply, display panel 5V / 12V isolated power supply)

· LED drive power supply (low power isolated LED drive)

· Battery charger (power tools, mobile power)


Tips for Selection:

· 10-15W Power Section Best Price Performance

· Horizontal installation suitable for low height PCB (adapters, thin filling appliances)

· Standing installations are suitable for a regular layout and have more space for loops


EE1512 The “Little Cannon” of the Fast Charging Era

Typical applications:

· 20W PD Fast Charge Charger (iPhone / iPad standard power section)

· 18W-20W Type-C Quick Charge Adapter

· Transformers selection in gallium nitride fast charge scheme

· Small volume high power density DC-DC converter


Tips for Selection:

· Ae = 41.4mm2, greatly improved power density at the same volume

· Recommended PC95 / PC96 material, suitable for 100-450 kHz high frequency work

· Compact form factor (14.5 × 18.7 × 12 mm), designed for thin fast charging

· When used with GaN devices, pay attention to the change of core loss caused by frequency increase

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