TNY280PN datasheet & circuit diagram | pdf

TNY280PN Pinout Equivalent

TNY280PN is the AC-DC transfer switching power supply chip, which is mainly characterized by good energy saving effect, different capacitors can be connected through BP/M pins, and different current limiting values can be selected. It is mainly used in digital cameras, MP3 players, portable audio devices, etc.

Note: The absence of pin 3 simplifies the package structure and makes it easy to distinguish between different pins such as drain and Bias Power.

TNY280PN table of replacement models of the same type

Picture	Name	Company	Operating Frequency	Output Power	Package
	TNY280PN	Power Integrations	132 kHz	Up to 8W	DIP-7
	LD7535	Leadtrend Technology	65 kHz	Up to 7W	SOT23-6
	LNK306PN	Power Integrations	100 kHz	Up to 3W	DIP-8
	MC34063A	ON Semiconductor	100 kHz	Up to 1.5W	DIP-8
	UC3842	Texas Instruments	100 kHz	20-100W	DIP-8
	VIPer12A	STMicroelectronics	65 kHz	Up to 12W	DIP-8

Note:

The best alternative to TNY280PN is LD7535, which operates at a frequency of 65 kHz and has a packaging shape similar to TNY280PN. The main issue to consider when using LNK306PN, MC34063A, UC3842, and VIPer12A as alternatives is the operating frequency. The operating frequency of these models is different from TNY280PN, and the circuit and electronic components may need to be modified. For example, the operating frequency of TNY280PN is 132kHz, while the frequencies of LNK306PN, MC34063A, and VIPer12A are 100kHz, 100kHz, and 65kHz, respectively. In addition, UC3842 requires external components and driver circuits, making replacement more complex.

The frequency changes, and the charging and discharging speed of the inductor and capacitor in the circuit changes. The frequency is high, they charge and discharge quickly, and the loss is large. Devices such as power semiconductors, which operate at high frequencies, also have increased switching losses. After a long time, the component will heat up seriously, the life will be short, and it may also be broken due to overheating, causing short circuit and other dangers