TOP260EG

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The popularity and usage of AC-DC and switched-mode power supplies have gained immense attention. The design of power supplies has become critical and integrated into essential electronics. Furthermore, developments in topologies and components have enabled highly efficient, compact and reliable power supplies. The TOP260EG as an example is such a device, it is an AC-DC converter optimized to provide low cost, high efficiency and high performance all at the same time.

The TOP260EG is a basic monolithic power supply, an internally compensated current-mode PWM controller which is suitable for off-line power supplies, such as battery chargers, and adapters. The device provides a single-ended input voltage of up to 15 volts, with an output current up to 3 amperes. The TOP260EG is available in a DIP-14 package that is suitable for low cost, high reliability and high efficiency applications. The device also offers an integrated Power Good signal and extremely low-standby power consumption when compared to competing devices in its power class.

The TOP260EG features an internal N-channel power MOSFET, current and temperature sense elements, starting and running bias, and current mode PWM controller which makes it become a complete, self-contained and extremely cost-effective solution for small power supplies. The device also offers over-current protection, over-temperature protection, output voltage feedback and a Power Good signal.

The TOP260EG works with the following key features:

• Internal single N-channel MOSFET
• Input voltage up to 15V
• Output current up to 3A
• Current mode PWM controller
• Temperature and current sense elements
• Output voltage feedback
• Over-current and over-temperature protections
• Low standby power consumption

The working principle of the TOP260EG is as follows:

The TOP260EG is a current mode PWM controller that employs a loop regulation of the output voltage. The internal circuit consists of both a voltage and temperature compensation loop to enable its accurate operation. This circuitry allows the controller to provide accurate results while minimizing its size.

The TOP260EG uses an external sensing resistor to monitor output current. The sensing resistor senses the voltage drop when the current passes through the resistor. This voltage signals is then compared with the voltage signal from the internal reference voltage for the set point (default output voltage) and the externally adjusted output voltage to maintain the output voltage regulation.

The internal current sensing circuit is closely coupled to the output voltage of the device. This helps to reduce EMI noise and also helps to maintain stability. When the output current load increases, the voltage feedback signal is used by the device to adjust the internal MOSFET to maintain the output voltage at the set point.

In addition, the TOP260EG also provides over-voltage protection (OVP) on the output voltage. If the output voltage rises beyond the OVP threshold, the device quickly shuts down the internal MOSFET and protects the output from surges. This feature helps to ensure the longevity and reliability of the device and extends its functionality.

The TOP260EG is a high performance AC-DC converter with best-in-class power efficiency and cost-effectiveness. It is suitable for a range of applications and highly reliable for off-line power supplies such as battery chargers and adapters. The integrated features and protections make it a robust solution for medium and high power applications.

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