TOP253PN Datasheet & Pinout | PDF

TOP253PN Pinout

TOP253PN is an off-line switching power supply chip. Mostly used for PWM control, oscillator, thermal shutdown circuit. The following is the pin wiring diagram.

Note:

Pin 3 is not present. A notch is left to indicate this location, primarily to make it easier to distinguish the order and orientation of the pins.

TOP253PN Equivalent

This is a table of equal types for TOP253PN

Picture	Name	Company	Operating Frequency	Input Voltage Range	Package
	TOP253PN	Power Integrations	66kHz	85-265VAC	eSIP-7C/DIP-8C
	BPA8505D	Shenzhen Huadrill Electronic Co.	Adaptive, up to 45kHz	85-265VAC	SOP-7
	LNK305DG	Power Integrations	66kHz	85-265VAC	eSIP-7C
	PN8016	Chilsin Microelectronics	PFM control with variable frequency	85-265VAC	SOP7
	PN8034CSSC-R1	Chilsin Microelectronics	PFM control with variable frequency	85-265VAC	DIP-7/SOP-7N
	TNY274PN	Power Integrations	132kHz	85-265VAC	DIP-8

Note:

The best replacement is the LNK305DG, which has the same operating frequency of 66kHz as the TOP253PN, the same input voltage range of 85-265VAC, and a similar package shape as the TOP253PN. When using PN8016 and PN8034CSSC-R1 as replacements, the main issue to consider is the package. When using BPA8505D and TNY274PN as replacements, circuit and electronic components may need to be modified due to its different operating frequency from TNY274PN. Avoid damage to electronic components. PFM control with variable frequency： Adjust the output by changing the frequency of the switch pulse while keeping the pulse width relatively constant. For example, just like controlling the water output of a faucet, the pulse frequency is like the number of times the faucet is turned on and off, and the pulse width is like the length of time the water flows out each time the faucet is turned on and off. PFM control is the process of adjusting the water output by varying the number of times water is released to control the total water output. The advantage of PFM control is that it can save electricity under light load and flexibly adjust the output; The disadvantage is that the frequency variation range is limited, which can easily generate electromagnetic interference, and the control is relatively complex.