EVAL5981

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The EVAL5981 evaluation board is a power supply for DC/DC and AC/DC off-line SMPS (switched mode power supply). This power supply evaluation board provides an efficient, reliable and safe source of power supply for different applications.

The input voltage range of the EVAL5981 is from 85V AC to 264V AC. The output voltage of the board is adjustable from 5V to 12V DC. The output current of the circuit is as high as 1.51A. The power that can be delivered from this evaluation board is up to 18.12W.

The major components of the EVAL5981 evaluation board are: a transformer, a diode bridge rectifier, a MOSFET switch, a soft start device, an opto-coupled feedback circuit and a current pulse transformer.

The transformer transforms the AC input voltage to a lower distributed voltage, which is sent to the diode bridge rectifier to convert to direct current (DC). The DC current is expended to the switch, which is powered by the MOSFET. The MOSFET switch is used to control the frequency of the output voltage and support the soft start device. The soft start device provides a burst current during the start-up of the circuit and reduces the inrush current to a lower level, which makes the circuit protection more effective.

The opto-coupled feedback circuit is used to track and control the output voltage of the EVAL5981. This feedback circuit compares the output voltage of the circuit with the reference voltage. When the output voltage is lower than the reference voltage, it will increase the duty-cycle of the MOSFET switch; When the output voltage is higher than the reference voltage, it will decrease the duty-cycle of the MOSFET switch to regulate the output voltage. The current pulse transformer is used to provide a reliable tripping current to the under voltage protection.

The EVAL5981 is mainly applied in power supplies for medical instruments, consumer electronics, telecommunications, large home appliances and others. The features of the evaluation board, such as international safety standards, fast response time, and high efficiency, make it possible for many applications. In addition, the design of the EVAL5981 is quite simple, which can reduce the cost of development and production.

To sum up, the EVAL5981 is a cost-efficient and reliable power supply for DC/DC and AC/DC off-line SMPS. With its simple circuit design, fast response time, high efficiency, and international safety standards, the EVAL5981 is an excellent choice for many applications.

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