TOP221PN Power Integrations Integrated Circuit (Dual-In-Line Packages) In Stock
Power Integrations TOP221PN is a voltage-mode PWM switch IC in a DIP-8 package that integrates MOSFET, control, and protection into a single device for off-line flyback power supplies. Supports up to 0.28A output current with built-in current limiting and auto-restart. Available from stock with worldwide shipping.
- Manufacturer
- Power Integrations
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- NOT RECOMMENDED
- Datasheet
- TOP221PN Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrates PWM controller, power MOSFET, and protection circuitry in a single DIP-8 package, reducing external component count for off-line power supply designs
- Voltage-mode pulse width modulation with built-in auto-restart and cycle-by-cycle current limiting providing robust fault protection without additional ICs
- 0.28 A maximum output current capability enabling compact, low-cost flyback converters for consumer and industrial adapter applications
Applications
The TOP221PN is designed for low-power off-line flyback switch-mode power supplies used in AC adapters, set-top boxes, and industrial auxiliary power rails. Its integration of the PWM controller and power MOSFET into a DIP-8 body simplifies PCB layout and reduces the total component count compared to discrete designs, enabling cost-effective solutions under 10 W. Power supply engineers also use it in battery chargers and standby power circuits where efficiency and fault protection are required in a minimal footprint.
Specifications
| Factory Lead Time | 8Weeks |
| Date Of Intro | 1997-04-14 |
| YTEOL | 3 |
| Analog IC - Other Type | POWER SUPPLY SUPPORT CIRCUIT |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.28A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 110kHz |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | PURE MATTE TIN |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What output current does the TOP221PN support and for which power range is it best suited?
The TOP221PN is rated for a maximum output current of 0.28 A, making it appropriate for flyback power supply designs targeting output power levels up to approximately 10 W, such as low-power AC adapters, battery chargers, and standby rail converters in consumer electronics.
How does TOP221PN reduce external component count compared to a discrete PWM controller plus MOSFET design?
TOP221PN integrates the voltage-mode PWM controller, power MOSFET, start-up circuit, current limiter, and auto-restart protection into a single DIP-8 IC, eliminating the separate gate driver, bias supply capacitor, current sense resistor, and MOSFET components that a discrete design requires, reducing the BOM by 5 to 8 components in a typical 5 W flyback converter.
What protection mechanisms are built into the TOP221PN?
The TOP221PN includes cycle-by-cycle peak current limiting that prevents transformer saturation under overload, plus an auto-restart function that shuts down the converter and periodically attempts restart when an output short-circuit or overload is detected, limiting average fault power dissipation and protecting downstream circuitry without requiring an external supervisor IC.
Is the TOP221PN in a DIP-8 package compatible with through-hole PCB assembly processes?
Yes. The DIP-8 package is a standard 8-lead dual in-line through-hole format with 2.54 mm pin pitch, fully compatible with wave soldering and hand-soldering processes, and socketed prototyping, making it straightforward to use in both low-volume development boards and moderate-volume production runs without SMT reflow equipment.
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