TNY268PN is a high-efficiency offline switcher mainly used for power management in low voltage and low current applications. It has built-in 700V power MOSFET, oscillator, high voltage switching current source, current limit and thermal shutdown circuitry, making It can effectively control and manage power. The device is packaged in an 8-pin DIP, making it more convenient in circuit design. Start-up and operating power comes directly from the voltage on the DRAIN pin, eliminating the need for additional bias windings and associated circuitry, further simplifying power supply design.

Since TNY268PN has the EcoSmart function, it can automatically enter sleep mode when idle, further reducing power consumption and improving efficiency. When the load current is lower than 50mA, it will automatically enter sleep mode, thus saving energy.

In addition, TNY268PN also has a temperature protection function. If the chip temperature exceeds 150℃, it will automatically turn off the power to prevent overheating. This self-protection mechanism increases the stability and reliability of the system.

Ⅰ.Specification parameters of TNY268PN

•Manufacturer:Power Integrations
•Product category:AC/DC converter
•Package/Case:DIP-8
•Output power:15W
•Output voltage:5.8V
•Switching frequency:132kHz
•Input/Supply Voltage—Min:85VAC
•Input/Supply Voltage—Max:265VAC
•Minimum operating temperature:-40℃
•Maximum operating temperature:+150℃
•Operating power supply current:380uA
•Output current:588 mA
•Trademark:Power Integrations
•Rated power:23W
•Number of output interfaces:1
•Output voltage:700V
•Breakdown voltage:700V
•Output current:880mA
•Number of adjustment outputs:1
•Number of pins:7
•Duty cycle:65%
•Maximum duty cycle:68%
•Number of output terminals:1 Output
•Packaging:Tube
•Fault protection:Current limit, open loop, over temperature, short circuit
•Control characteristics:EN
•Topology:Flyback

Ⅱ.Characteristics of TNY268PN

1.TinySwitch-II Features Reduce System Cost

•Expanded scalable device family for low system cost

•Very tight tolerances and negligible temperature variation on key parameters eases design and lowers cost

•Lowest component count switcher solution

•Built-in circuitry practically eliminates audible noise with ordinary dip-varnished transformer

•Fully integrated auto-restart for short circuit and open loop fault protection – saves external component costs

2.In open frame design, output power is 23W at 230VAC, 15W at 85VAC to 265VAC

3.Non-vented enclosed adapter has an output power of 16W at 230VAC and 10W at 85VAC to 265VAC

4.High Performance at Low Cost

•High bandwidth provides fast turn on with no overshoot

•High voltage powered – ideal for charger applications

•Built-in current limit and thermal protection improves safety

•Current limit operation rejects line frequency ripple

5.Simple design virtually eliminates rework in manufacturing Built-in current limiting and thermal protection increase safety Operating junction temperature range is -40°C to 150°C

6.132KHz operation reduces transformer size, uses EF126 or EE13 cores for low cost and small size

7.Better Cost/Performance over RCC & Linears

•Cost effective replacement for bulky regulated linears

•Lower system cost than RCC, discrete PWM and other integrated/hybrid solutions

•No bias winding–simpler, lower cost transformer

•Simple design practically eliminates rework in manufacturing

Ⅲ.Basic working principle of TNY268PN

1.Basic topology: TNY268PN is usually used in offline switching power supplies, using a topology called "TinySwitch", which is an integrated switching power supply topology developed by Power Integrations.

2.Feedback mechanism: TNY268PN monitors the output voltage through a feedback circuit to maintain output stability. By comparing the actual output to the setpoint, the controller can adjust the switch's operating frequency and duty cycle to maintain the output within the desired range.

3.Transformer work: The controller realizes power conversion by switching the transformer. The two sides of the transformer are connected to the input and output circuits respectively to achieve input voltage conversion and output voltage isolation.

4.Energy-saving mode: Controllers usually have an energy-saving mode at low loads to improve overall system efficiency. At lighter loads, the switching frequency can be reduced to reduce power consumption.

5.Switching operation: TNY268PN controls the switching operation of the power supply through the internal switching tube. This switching operation allows the input voltage to be switched at high frequency, thereby reducing the size of the transformer and improving system efficiency.

6.Protection function: TNY268PN usually also contains some protection mechanisms, such as over-current protection, over-temperature protection, etc., to ensure the safe and stable operation of the system.

Ⅳ.Application fields of TNY268PN

1.Power adapter: TNY268PN is a chip that is very suitable for designing various types of power adapters. Due to its high efficiency, low power consumption, low cost and ease of use, it is widely used in various power adapter designs, including desktop power adapters and portable chargers. For desktop power adapters, TNY268PN can meet different output voltage and current requirements by adjusting the parameters of external components. This flexibility allows it to adapt to the needs of different devices and electronics. In addition, thanks to its EcoSmat function, it can automatically enter sleep mode when idle, further reducing power consumption and improving efficiency. For portable chargers, the high-efficiency performance and low power consumption of TNY268PN enable it to achieve low heat and low noise while ensuring charging efficiency, providing users with a good experience. In addition, its built-in current limit and thermal shutdown circuit can also effectively protect the safety of the battery and charger, improving the reliability of the entire charging system.

2.LED lighting: TNY268PN is a common LED driver integrated circuit that is often used in LED lighting applications. It is an efficient, low-cost solution that can be used to drive LED strings or LED arrays.

3.Industrial power supply:TNY268PN can be used for power supply of various industrial equipment and systems. Its stable output and efficient performance make it ideal for many industrial applications.

4.Household appliances: TNY268PN is a universal switching power supply chip, commonly used in various household appliances, such as refrigerators, microwave ovens, washing machines, etc. This kind of chip is usually used to control the switch of the power supply to achieve stable output of the power supply and energy saving effect. TNY268PN has overheating protection and overvoltage protection functions, which can effectively protect household appliances from overheating and voltage instability. In addition, it also has the characteristics of low power consumption, which can effectively reduce the working energy consumption of household appliances, thereby achieving the purpose of energy saving and emission reduction.

5.Communication equipment: TNY268PN switching power supply chip can also be widely used in the design of power modules for communication equipment, such as routers, switches, etc. In communication equipment, power modules are a crucial component, which need to achieve high efficiency, high reliability, low power consumption and other characteristics to ensure the stable operation of the equipment and energy conservation and environmental protection. As a common switching power supply chip, TNY268PN can meet these requirements and has overheating protection and overvoltage protection functions, which can effectively protect communication equipment from overheating and voltage instability. In the power module design of communication equipment, TNY268PN can achieve stable voltage output and efficient energy conversion through reasonable circuit design and parameter settings. At the same time, it can also improve the energy efficiency ratio of the equipment and reduce the operating temperature of the equipment by optimizing the circuit topology and control strategy, thereby improving the overall performance and reliability of the communication equipment.

6.Medical equipment: Medical equipment often includes patient monitoring equipment, such as electrocardiographs, blood pressure monitors, etc. TNY268PN can be used as power modules for these devices to ensure that the devices can provide stable power supply continuously and reliably. In medical imaging equipment such as X-ray machines, CT scanners and MRI equipment, the stability of the power supply is critical to image quality. The TNY268PN can help ensure stable power output for these devices to support precise imaging. Medical equipment used in operating rooms, such as operating lights, electrosurgical units, etc., have extremely high requirements on the reliability and stability of the power supply. TNY268PN can provide efficient power management to ensure the safe operation of surgical equipment.

7.Automotive electronics: TNY268PN can be integrated into a car charger to provide stable charging power for mobile devices (such as mobile phones and tablets). Its efficient switching power supply design helps reduce size and improve charging efficiency. For some electronic devices inside the vehicle, such as GPS navigators, driving recorders, etc., TNY268PN can be used as a key component of the power adapter to ensure that these devices receive stable power.

Ⅴ.Circuit board layout of TNY268PN

Ⅵ.Protection function of TNY268PN

1.Overvoltage protection: TNY268PN usually has an overvoltage protection mechanism to prevent the output voltage from exceeding the set safety range. This typically includes an overvoltage feedback circuit that monitors the output voltage and triggers protection when a set threshold is reached.

2.Overheating protection: TNY268PN usually contains an overheating protection mechanism to prevent the chip temperature from being too high. Through an internal temperature sensor or other monitoring means, the controller can detect an increase in chip temperature and trigger a protection mechanism, which may include reducing the switching frequency, reducing the output power, or shutting down the output completely.

3.Overcurrent protection: TNY268PN may also have an overcurrent protection function to prevent the output current from exceeding the set safety level. By monitoring the output current, the controller can take timely measures, such as adjusting the switching frequency or reducing the duty cycle, to limit the output current.

4.Soft start and shutdown: TNY268PN may adopt soft start and shutdown technology to reduce the current and voltage impact when the system starts and shuts down, and improve the stability of the system.

5.Short circuit protection: For output short circuit conditions, TNY268PN may also take corresponding protective measures, such as turning off the output immediately to prevent the current from reaching dangerous levels.

Frequently Asked Questions

1.What are the key features of TNY268PN?
TNY268PN typically features overvoltage protection, overcurrent protection, thermal shutdown, and other protection mechanisms. It operates as a switch-mode power supply controller with a focus on efficiency and reliability.

2.In which electronic devices can TNY268PN provide a stable power source?
TNY268PN can provide a stable power source for a variety of electronic devices, including power adapters, LED lighting systems, household appliances, industrial equipment, communication devices, and automotive electronics.

3.How does TNY268PN achieve a wide input voltage range?
TNY268PN achieves a wide input voltage range through the feedback mechanism of the transformer. This means that the transformer design of the switching power supply is adaptable and can effectively respond to changes in input voltage.

4.How to choose the appropriate TNY268PN model?
Determine the application's power requirements, including output voltage and output current. TNY268PN is often used to design power modules with different power requirements, so when choosing a model make sure it can meet your power and current needs. Consider the input voltage range of the application. The TNY268PN can accommodate a wide range of input voltages, but be sure to choose a model that covers all voltage conditions your system may encounter