TOP256EN datasheet, equivalent, circuit, pdf

TOP256EN Pinout

TOP256EN belongs to TOPSwitch-HX series of switching power controller chips. It is mainly used in cell phone fast charging module, electrical appliance power module, motor drive and so on.

Note:

Wiring should be carefully checked before testing to avoid dangerous situations such as short circuits and leakage.

top256en equivalent

Below is a table of replacement models for TOP256EN.

Picture	name	company	operating frequency	Input Voltage Range	Package
	TOP256EN	Power Integrations	22 kHz	85-265VAC	ESIP-7
	LNK3050GN	Power Integrations	65 kHz	85-265VAC	SOP-7
	TNY280PN	Power Integrations	132 kHz	90-265VAC	DIP-7
	UC38428	Texas Instruments	132 kHz	8-40VAC	DIP-8
	NCP1079BAP130G	ON Semiconductor	132 kHz	85-265VAC	PDIP-7
	TNY284PG	Power Integrations	100 kHz to 500 kHz	85-265VAC	DIP-7

Note:

The best alternative to TOP256EN is LNK3050GN, which has an input voltage range of 85-265VAC and a similar packaging shape to TOP256EN. The main issue to consider when using TNY280PN, UC38428, NCP1079BAP130G, and TNY284PG as substitutes is the operating frequency. The operating frequency of these models is different from TOP256EN, and circuit and electronic components may need to be modified. For example, the operating frequency of TNY280PN and NCP1079BAP130G is 132kHz, while the frequency range of TNY284PG is 100kHz to 500kHz. In addition, UC38428 requires external MOSFETs and driver circuits, which makes the replacement process more complex but more efficient.
If substitutes are used directly, it will cause the components to heat up. Simply put, as the operating frequency increases, energy storage components such as inductors and capacitors in the circuit charge and discharge faster, which increases component losses. Moreover, devices like power semiconductors operate at high frequencies, resulting in increased switching losses. Just like how running too fast can make people tired, if the components heat up severely, their lifespan and reliability will decrease, and they may even break down due to overheating, causing safety issues. For example, overheating of an inductor may cause the insulation layer of the coil to break, leading to a short circuit.