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Overview of Switch-GX Family : TOP245YN TOP

Author: Tanssion Date: 2023-11-08 Hits: 0

Ⅰ. TOP245YN Description
Ⅱ. TOP245YN Pinout
Ⅲ. TOP245YN 3D Model
Ⅳ. TOP245YN Specifications
Ⅴ. TOP245YN Feature
Ⅵ. TOP245YN Application Examples
Ⅶ. TOP245YN Package Information
Ⅷ. TOP245YN Datasheet

Ⅰ. TOP245YN Description

The TOP245YN is a TOPSwitch-GX EcoSmart integrated off line switcher in 6 pin TO-220 package. TOPSwitch-GX uses the same proven topology as TOPSwitch which cost effectively by integrating high voltage power MOSFET, PWM control, fault protection and other control circuitry onto a single CMOS chip. Many new functions are integrated to reduce system cost, improve design flexibility, high performance and energy efficient. The TOP245YN features soft start, frequency jittering for lower EMI, wider DCMAX, hysteretic thermal shutdown and larger creepage packages. In addition all critical parameters (current limit, frequency, PWM gain) have tighter temperature and absolute tolerances to simplify design and optimize system cost.

Ⅱ. TOP245YN Pinout

1. TOP245YN Pinout 

2. TOP245YN Pin Functions

PIN  Name

PIN  number




Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used as the connection point for the supply bypass and auto-restart/ compensation capacitor.

LINE-SENSE (L) Pin: (Y, R or F package only)


Input pin for OV, UV, line feed forward with DCMAX reduction, remote ON/OFF and synchronization. A connection to SOURCE pin disables all functions on this pin.

EXTERNAL CURRENT LIMIT (X) Pin: (Y, R or F package only)


Input pin for external current limit adjustment, remote ON/OFF, and synchronization. A connection to SOURCE pin disables all functions on this pin.



Output MOSFET source connection for high voltage power return. Primary side control circuit common and reference point.

FREQUENCY (F) Pin: (Y, R or F package only)


Input pin for selecting switching frequency: 132 kHz if connected to SOURCE pin and 66 kHz if connected to CONTROL pin. The switching frequency is internally set for fixed 132 kHz operation in P and G packages.



High voltage power MOSFET drain output. The internal start-up bias current is drawn from this pin through a switched high-voltage current source. Internal current limit sense point for drain current.

Ⅲ. TOP245YN 3D Model

1.TOP245YN Symbol 

2. TOP245YN Footprint

3. TOP245YN 3D Model

Ⅳ. TOP245YN Specifications




Integrated Circuits (ICs)

Power Management (PMIC)

AC DC Converters, Offline Switches


Power Integrations





Product Status

Not For New Designs

Output Isolation


Internal Switch(s)






Voltage - Supply (Vcc/Vdd)


Duty Cycle



66kHz ~ 132kHz

Power (Watts)


Fault Protection

Current Limiting, Over Temperature, Over Voltage

Control Features

Frequency Control

Operating Temperature

-40°C ~ 150°C (TJ)


TO-220-7 Formed Leads, 6 Leads

Supplier Device Package


Mounting Type

Through Hole

Base Product Number


Ⅴ. TOP245YN Feature

• Extended power range for higher power applications 
• No heatsink required up to 34 W using P/G packages 
• Features eliminate or reduce cost of external components 
• Fully integrated soft-start for minimum stress/overshoot 
• Externally programmable accurate current limit 
• Wider duty cycle for more power, smaller input capacitor 
• Separate line sense and current limit pins on Y/R/F packages 
• Line under-voltage (UV) detection: no turn off glitches 
• Line overvoltage (OV) shutdown extends line surge limit 
• Line feed-forward with maximum duty cycle (DCMAX) reduction rejects line ripple and limits DCMAX at high line 
• Frequency jittering reduces EMI and EMI filtering costs 
• Regulates to zero load without dummy loading 
• 132 kHz frequency reduces transformer/power supply size 
• Half frequency option in Y/R/F packages for video applications 
• Hysteretic thermal shutdown for automatic fault recovery 
• Large thermal hysteresis prevents PC board overheating

Ⅵ. TOP245YN Application Examples

• A High Efficiency, 30 W, Universal Input Power Supply
• A High Efficiency, Enclosed, 70 W, Universal Adapter Supply
• A High Efficiency, 250 W, 250-380 VDC Input Power Supply
• Multiple Output, 60 W, 185-265 VAC Input Power Supply
• Processor Controlled Supply Turn On/Off

Ⅶ. TOP245YN Package Information

Ⅷ. TOP245YN Datasheet


Frequently Asked Questions

1、1.What is the TOP245YN used for?
The TOP245YN is used for designing power supplies and converters. It provides a compact and efficient solution for various off-line power applications, such as AC/DC power supplies, battery chargers, and LED drivers.
2、2.What are the key features of the TOP245YN?
The TOP245YN typically offers features like a built-in high-voltage MOSFET, pulse-width modulation (PWM) control, under-voltage lockout (UVLO), over-temperature protection, and other fault protection mechanisms.
3、3.How do I use the TOP245YN in a power supply circuit?
Using the TOP245YN in a circuit typically involves connecting it to the input voltage source, designing feedback and compensation components, and configuring the output voltage and current. The datasheet for the TOP245YN will provide detailed application notes and recommended circuit configurations.
4、What is the typical voltage and current ratings for the TOP245YN?
The voltage and current ratings may vary depending on the specific model or variant of the TOP245YN. You should consult the datasheet for the exact specifications of the particular device you plan to use.

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