LNK304DN pinout & schematic | SMD

LNK304DN-TL datasheet

LNK304DN Pinout Equivalent

LNK304DN is a highly integrated non-isolated switching Power supply IC from Power Integrations, belonging to the LinkSwitch-TN series, which integrates a switching control circuit with a voltage resistance of 700V MOSFET. Mainly suitable for low-power AC-DC conversions (e.g. 5V/1A output). Its core features include:
Package: There are two kinds of package respectively SOIC-8 or SOP-7;
Output capacity: Maximum output current 120mA (MDCM mode) or 170mA (CCM mode);
Operating frequency: 66kHz, frequency jitter can be achieved to reduce EMI interference;
Typical applications: DCDC power supply, LED driver, small home appliance control board.

Pins are defined as follows:

Replacement model parameter comparison:

Picture	Name	Operating Frequency	Power	Package	Application Scenario
	LNK304DN	66 kHz	5.5W	SOIC-8	Non-isolated power supply
	LNK306DN	66 kHz	10W	SOP-7	The situation of high current demand
	TNY288PG	132 kHz	10W	DIP-8C	Industrial power supply design
	TOP265KG	132 kHz	30W	eSOP-12	High power supply

Alternate summary:

Direct replacement: The same series of upgrade products LNK30xDN model (such as LNK304DN) is preferred, without modifying any circuit design.
Function expansion replacement: TNY288PG for the circuit protection function is stronger than lnk304dn, can be used in the need for adequate protection of the circuit, but need to adjust the feedback circuit; The TOP265KG is suitable for high power scenarios, but the circuit needs to be redesigned.