TOP246YN datasheet & circuit diagram | pdf

top246yn circuit diagram| top246yn pinout

TOP246YN Pinout Equivalent

TOP246YN is an offline switching power supply controller. It is characterized by the ability to output a relatively large amount of power, can adapt to a variety of voltages, and the frequency of switching can be selected. It is mainly used in computer power supply, home appliance power supply and other fields.

Note: The direct from designation 5 to designation 7 is due to the fact that it is a multifunction pin (M) in other packages, but it is not available in TOP246YN (TO-220-7C).

TOP246YN Same Type Replacement Table

Picture	Model	Manufacturers	Withstand Voltage Value	Switching Frequency Range	Maximum Duty Cycle	Rated Power	Encapsulation
	TOP246YN	Power Integrations	700V	110kHz – 132kHz	80%	150W	TO-220
	CR6842S	NCE Power	800V	50kHz – 100kHz	80%	50W	SOIC-8
	ICE3BR2565JF	Infineon Technologies	650V	20kHz – 100kHz	75%	65W	TO-220
	L6565	STMicroelectronics	700V	100kHz – 150kHz	50%	70W	DIP-8
	SM7505	Sanken Electric Co., Ltd.	600V	50kHz – 100kHz	80%	50W	SOIC-8
	VIPer27L	STMicroelectronics	700V	50kHz – 100kHz	80%	60W	SOIC-8

Note: In the same type of replacement table for TOP246YN, CR6842S is the best replacement, with the same withstand voltage value of 700V and a maximum duty cycle of 80%, and although its package form is different, it is no problem to install in most cases. When using CR6842S as a substitute. Note that his power rating of 50W is much lower than TOP246YN’s 150W, and if a higher power is required in the circuit, then he is not suitable. The SM7505, ICE3BR2565JF and VIPer27L have some parameters that are close to the TOP246YN, but the frequency is not the same, and the circuit may need to be adjusted. The maximum duty cycle is different, which will make the output voltage inaccurate, the circuit work chaotic, and the adjustment is difficult to stabilize.

TOP246YN Circuit Diagram

This 30W power supply circuit is designed for high efficiency and compact size, using the TOP244Y (TOPSwitch-GX) IC. It delivers a regulated 12V @ 2.5A output from a wide 85-265VAC universal input, making it ideal for industrial, consumer, and embedded applications.

Key Features and Benefits:

Wide Input Voltage Range (85-265VAC): Compatible with global mains standards.

High Efficiency (up to 80%): Reduced heat generation and improved energy savings.

Precise Current Limit Control: External resistors R1 and R2 optimize the drain current, preventing transformer saturation and reducing component size.

Advanced Protection: Adaptive current limiting reduces overload risks at high-line input. R4 ensures accurate under-voltage (UV) and over-voltage (OV) protection (100 VDC/450 VDC).

Compact Transformer Design: RCD clamp (R3, C3, D1) and high-reflected voltage enable a smaller transformer core and efficient operation.

Extended Duty Cycle (75%): Supports use of a smaller input capacitor (C1), saving board space.

Low Reverse Voltage Stress: Optimized transformer turns ratio allows use of a 60V Schottky rectifier (D8), improving output stage efficiency.

Low Standby Power: Frequency reduction and jitter eliminate the need for dummy loads and enhance EMI compliance (CISPR 22 / FCC Class B).

Output Voltage Regulation:

Regulation is achieved via a low-cost Zener and optocoupler feedback loop. The output voltage is determined by Zener diode VR2, the LED in optocoupler U2, and resistor R6. R8 provides bias for stable operation. This approach ensures ±5% regulation across line and load changes.