TEA2261

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The TEA2261 is a pulse width modulation (PWM) controller consisting of a fully-integrated control circuit with a high voltage source self oscillator and thermal protection circuit. It is designed to offer an economical solution for a range of low, medium and high power application fields requiring cost and space savings. This PWM controller is used in AC-DC converters, offline converters and off-line switchers for a range of applications ranging from mobile device chargers, uninterrupted power supplies (UPS), power supply/distribution system, electronic ballast and some niche products.

Design Solution

The TEA2261 provides space and cost savings enabling designers greater freedom to deliver effective solutions that meet their customer\'s needs. The wide power range of the device allows designers to optimize the design size while maintaining top performance. The market friendly solutions offered by the controller make it an ideal choice for power supply systems with fewer components and lower system costs. With LED lighting in high demand, the TEA2261 has become a versatile alternative as well, due to its superior performance compared to standard down-converters.

Working Principle

The TEA2261 outputs an asymmetrical duty cycle signal which is used to drive a high side MOSFET and a low side MOSFET in the H-bridge circuit. The changes in duty cycle of this signal causes the current in the primary windings of the transformer to increase or decrease. With improved PWM solutions and high switching frequency, both the MOSFETs can be used with an internal PWM signal and no external components needed. The PWM output is compared with an internal voltage reference and this sets the duty cycle according to the reference voltage.

The TEA2261 also includes an over current protection feature which senses the current in the output winding and sets a reference voltage. This voltage is compared with the voltage generated by the sense resistor in the H-bridge circuit, and if this exceeds the reference voltage, the device turns off the low side MOSFET. The controller also offers a power loss detection feature which turns off the device if the output current falls below a certain threshold.

Application Fields

The TEA2261 is used in AC-DC converter, offline converters and off-line switchers for a range of applications. It is widely used in systems requiring low current or low voltage. These include mobile device chargers, uninterrupted power supplies (UPS), power supply/distribution system etc. It is ideal for charging lithium-ion (Li-Ion) and nickel-cadmium (NiCd) battery packs, as well as other types of rechargeable batteries. It is also suitable for a wide range of lighting applications, including LED lighting.

The TEA2261 also offers a low noise solution for switching power supplies. Low noise is critical in applications such as instrumentation, digital audio equipment and touchscreens. The controller supports high switching frequency even for large loads and is ideal for applications requiring low EMI (electromagnetic interference).

Conclusion

The TEA2261 is a cost-effective and space-saving PWM controller offering a range of application fields and features. It is equipped with an improved PWM solution,high switching frequency,over current protection and power loss detection, making it suitable for a number of applications and ideal for medium to high power systems. With its low noise feature and small size, the device is an ideal choice for multiple applications ranging from mobile device chargers to LED lighting.

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