Overview
The TNY278PN is a member of the TinySwitch-III family of ICs produced by Power Integrations. This energy-efficient off-line switcher integrates a 700 V power MOSFET, oscillator, high-voltage switched current source, current limit circuitry, and thermal shutdown circuitry into a single device. It is designed to provide a simple ON/OFF control scheme without the need for loop compensation, making it a cost-effective and flexible solution for various power supply applications.
Key Specifications
| Specification | Value |
|---|---|
| Output Power (Max) - Open Frame, 230V | 28.00 W |
| Output Power (Max) - Enclosed, 230V | 16.00 W |
| Output Power (Max) - Enclosed, Universal | 10.00 W |
| Output Power (Max) - Open Frame, Universal | 21.50 W |
| Breakdown Voltage | 700 V |
| Voltage - Input (Min) | 85 V |
| Voltage - Input (Max) | 265 V |
| Auto-Restart & Overvoltage Response | Latch Off |
| IC Package | DIP-8C |
| Internal Switch | Yes |
| Mounting Type | Through Hole |
| Over-Temperature Response | Hysteretic |
| Temperature - Operating (Min) | -40 °C |
| Temperature - Operating (Max) | 150 °C |
| Control Scheme | Secondary-side |
| Control Features | Selectable Current Limit, Frequency Jittering, Auto-Restart/Latching Fault Response, On/Off Control |
| Protection Features | Output Open Loop, Output Overvoltage, Output Short Circuit, Output Undervoltage, Overtemperature |
| Topology | Flyback |
| Product Sub-Type | PMIC |
| Secondary Response | Auto-restart |
Key Features
- Simple ON/OFF Control: No loop compensation is required, simplifying the design process and reducing system cost.
- Selectable Current Limit: The current limit can be adjusted through the BP/M capacitor value, allowing for greater design flexibility and the ability to extend peak power or maximum continuous power.
- Frequency Jittering: Reduces EMI filter costs by minimizing the need for additional EMI filtering components.[
- Auto-Restart and Overvoltage Response: Latch-off response to overvoltage and auto-restart protection against output short circuit and open loop fault conditions.[
- High Efficiency and Low No-Load Consumption: Meets all existing and proposed harmonized energy efficiency standards with active-mode efficiency exceeding 75% and no-load consumption as low as 140 mW at 265 VAC.
- Integrated Safety and Reliability Features: Includes accurate thermal shutdown, output overvoltage protection, and undervoltage lockout to ensure safe and reliable operation.[
- EMI Design Aspects: Incorporates techniques such as pi filters and E-Shield™ shielding to achieve excellent conducted and radiated EMI performance.[
Applications
The TNY278PN is suitable for a wide range of applications, including:
- Universal Input Power Supplies: Supports input voltages from 85 V to 265 VAC, making it ideal for global use in various power supply designs.
- Enclosed and Open Frame Power Supplies: Can be used in both enclosed and open frame configurations, offering flexibility in design and application.[
- Low Cost, High Efficiency Power Supplies: Designed for applications requiring high efficiency and low no-load consumption, such as in consumer electronics and industrial power supplies.[
- EMI Sensitive Applications: The integrated EMI reduction features make it suitable for applications where electromagnetic interference is a concern.[
Q & A
- What is the maximum output power of the TNY278PN in an open frame configuration at 230V input?
28.00 W.
- What is the breakdown voltage of the TNY278PN?
700 V.
- What is the input voltage range for the TNY278PN?
85 V to 265 VAC.
- Does the TNY278PN have built-in overtemperature protection?
Yes, it features hysteretic overtemperature response.[
- How does the TNY278PN reduce EMI?
Through frequency jittering and the use of pi filters and E-Shield™ shielding techniques.[
- What is the control scheme used by the TNY278PN?
Secondary-side ON/OFF control.[
- Can the current limit of the TNY278PN be adjusted?
Yes, through the BP/M capacitor value.[
- What is the typical no-load consumption of the TNY278PN at 265 VAC?
As low as 140 mW.[
- Does the TNY278PN meet energy efficiency standards?
Yes, it meets all existing and proposed harmonized energy efficiency standards.[
- What type of topology does the TNY278PN use?
Flyback topology.[
