Products > Integrated Circuits (ICs) > Power Management ICs > TOP250YN

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AC/DC Converter IC, TOPSwitch-GX Family, Flyback, 85 VAC - 265 VAC, 210 W, TO-220-6

Manufacturer : Power Integrations, Inc
Package/Case : TO-220
Product Categories : AC/DC Switching Converters
Datasheet: TOP250YN Datasheet (PDF)
RoHs Status: Lead free / RoHS Compliant
In-stock: 5000


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TOP250YN Product Details

The TOP250YN is a 135W extended power design flexible integrated Off-line Switcher uses the same proven topology as TOPSwitch and it integrating the high voltage power MOSFET, PWM control, fault protection and other control circuitry onto a single CMOS chip. Many new functions are integrated to improve design flexibility, performance and energy efficiency. Line feed-forward with maximum duty cycle (DCMAX) reduction rejects line ripple and limits DCMAX at high line.

The TOP250YN is an integrated circuit (IC) that belongs to the TOPSwitch family, designed for power supply applications. This highly efficient and versatile IC is widely used in various electronic devices, providing reliable power management solutions.


Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.

  • Pin 1: FB (Feedback)

  • Pin 2: RT/CLK (Resistor Divider Tap or External Clock Sync)

  • Pin 3: BP/SD (Bypass/Soft-Start and Shutdown)

  • Pin 4: GND (Ground)

  • Pin 5: D (Drain)

  • Pin 6: S (Source)

  • Pin 7: V (Supply Voltage)

  • Pin 8: NC (No Connection)

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the TOP250YN IC for a visual representation of its application in power supply circuits.



  • Eliminate or reduce cost of external components

  • Fully integrated soft-start for minimum stress/over-shoot

  • Externally programmable accurate current limit

  • Wider duty cycle for more power, smaller input capacitor

  • Line under-voltage detection - No turn OFF glitches

  • Line over-voltage shutdown extends line surge limit

  • Regulates to zero load without dummy loading

  • Hysteretic thermal shutdown for automatic fault recovery

  • Large thermal hysteresis prevents PC board over-heating

  • Power Management IC: The TOP250YN is specifically designed for power supply applications, offering a comprehensive solution for efficient power management.

  • Versatility: This IC is versatile and can be utilized in a range of power supply configurations, making it suitable for diverse electronic systems.

  • Integrated Functions: The TOP250YN integrates essential functions such as a power MOSFET, PWM control, fault protection, and other features, streamlining the design of power supplies.

  • Enhanced Efficiency: With advanced design principles, the TOP250YN is known for its high efficiency, contributing to energy savings in electronic systems.

  • Over-Temperature Protection: The IC incorporates over-temperature protection mechanisms, enhancing the reliability and safety of power supply systems.

Note: Detailed technical specifications can be found in the TOP250YN datasheet.

TOP250YN Products


  • Switched-Mode Power Supplies (SMPS): The TOP250YN is commonly used in SMPS for efficient power conversion in various electronic devices.

  • Consumer Electronics: It finds applications in consumer electronic devices such as TVs, audio systems, and home appliances.

  • Industrial Power Supplies: The IC is suitable for industrial power supply units, providing stable and efficient power delivery.

  • LED Drivers: In lighting applications, the TOP250YN can be employed as an LED driver for efficient and controlled illumination.


The TOP250YN operates as a power management IC, regulating the power supply output through integrated control mechanisms. Its features include feedback control, soft-start, and protection functions.

Usage Guide

  • Feedback (FB - Pin 1): Connect the feedback path to regulate the output voltage.

  • Resistor Divider Tap or External Clock Sync (RT/CLK - Pin 2): Configure the resistor divider or connect an external clock sync for proper operation.

  • Bypass/Soft-Start and Shutdown (BP/SD - Pin 3): Utilize this pin for bypass, soft-start, or shutdown functions as needed.

  • Ground (GND - Pin 4): Connect to the ground reference of the system.

  • Drain (D - Pin 5): Connect to the power MOSFET and output filter components.

  • Source (S - Pin 6): Connect to the power ground.

  • Supply Voltage (V - Pin 7): Provide the supply voltage within the specified range.

Frequently Asked Questions

Q: What is the purpose of the feedback pin (FB)?

A: The feedback pin (FB) is used to regulate the output voltage of the power supply. Connecting it appropriately in the feedback network helps maintain the desired output.

Q: Can the TOP250YN be used in offline power supplies?

A: Yes, the TOP250YN is suitable for offline power supply applications, providing efficient and regulated power conversion.

Technical Parameters

  • Output Voltage
  • 12 V
  • Input / Supply Voltage (Max)
  • 265 VAC
  • Input / Supply Voltage (Min)
  • 85 VAC
  • Switching Frequency
  • 132 kHz
  • Supply Current
  • 2.4 mA
  • Operating Temperature Range
  • - 40 C to + 150 C
  • Mounting Style
  • Through Hole
  • Package / Case
  • TO-220
  • Packaging
  • Tube
  • Factory Pack Quantity
  • 2000
  • Type
  • Off Line Switcher

TOP250YN Equivalent Parts

For the TOP250YN component, you may consider these replacement and alternative parts.

Models Manufacturer Package/Case Description
TOP246YN POWER TO-220 AC/DC Off-Line Switcher IC, TOPSwitch-GX, Flyback, 85- 265 VAC, 132 kHz, 4.32 A out, 125 W, TO-220-7
TOP258PN POWER DIP-7 AC/DC Switching Converters Off-Line Switcher IC 35W/50W PK

TOP250YN Related Products

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Estimated Delivery Time: Jun 01 - Jun 06 days (choose Expedited at checkout).

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We provide high quality products, thoughtful service and after sale guarantee

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  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


  • Step1:Product

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    Step3: Anti-Static Bag

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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

Jotrin ESD packing


1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that TOP250YN is the original manufacturer or agent of POWER?
We have a professional business development department to strictly test and verify the qualifications of POWER original manufacturers and agents. All POWER suppliers must pass the qualification review before they can publish their TOP250YN devices; we pay more attention to the channels and quality of TOP250YN products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of TOP250YN chips? Including POWER original factory information, AC/DC Switching Converters application, TOP250YN pictures?
You can use Jotrin's intelligent search engine, or filter by AC/DC Switching Converters category, or find it through Power Integrations, Inc Information page.
Q: Are the POWER's TOP250YN price and stock displayed on the platform accurate?
The POWER's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for TOP250YN, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
Q: Can I place an order offline?
Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
Q: What forms of payment can I use in Jotrin?
TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
Q: How is the shipping arranged and track my package?
Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of TOP250YN?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the TOP250YN we delivered, we will accept the replacement or return of the TOP250YN only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of TOP250YN.
(3)The TOP250YN is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
Q: How to contact us and get support, such as TOP250YN datasheet pdf, TOP250 pin diagram?
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Power Integrations, Inc

Power Integrations, Inc. is a provider of high performance electronic components for high voltage power conversion systems and is headquartered in Silicon Valley, USA. ICs and diodes help design a compact, energy-efficient AC-DC power supply for a wide range of electronic products, including televis...
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