STR05S12

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DC-DC converters are the electronic devices used to produce a specific output voltage from an input voltage different than the output voltage. They are capable of supplying a variety of output voltages depending on the resistance value set on the input voltage. The STR05S12 is one such converter viewed as compact and efficient. This article delves into the application fields and working principle of the STR05S12.

Application field

The application field of the STR05S12 mainly focuses on low-profile and high-density power supply for a wide variety of devices. Generally, the STR05S12 is suitable for systems with a power requirement of up to 5W or 12V. It is particularly designed for use in commercial and industrial electronics fields such as industrial control, telecom, transportation, instrumentation, lighting, medical equipment, digital display, and office automation equipment.

Working Principle

The STR05S12 functions as a non-isolated step-down DC-DC converter. It operates on a synchronous rectification to convert the input voltage into a DC output voltage. It receives an input voltage of 8V to 72V and delivers a DC output voltage of 2.5V to 12V, changeable with the onboard potentiometer resistance. The onboard Safety over Voltage(SOV) threshold on the input voltage is from 6V to 97V.

The STR05S12 has a wide input voltage range of 8V to 72V that allows it to be directly connected with ac voltage sources without any additional voltage regulating equipment. During the operation, the onboard feedback voltage and the output voltage are compared and this difference is processed with the internal PWM control loop to generate the pulse width modulation (PWM) signal.

The PWM signal then controls the switching of the onboard transistors. The PWM signals are of a very high frequency, which ensures the minimum noise and allows efficient conversion. The onboard MOSFETs are controlled by the PWM signal and the transistors are then driven with an added schottky diode to prevent any large losses from happening.

The transistors then convert the input voltage to a regulated dc-dc voltage output to provide the required output current in the system. It contains the input under-voltage protection, current limitation, over-temperature protection, and output short-circuit protection to ensure a safe and reliable operation.

Conclusion

The STR05S12 is a highly efficient DC-DC converter used in applications requiring a low-profile and high-density power supply such as instrumentation and commercial and industrial electronics. It utilizes the synchronous rectifying method to convert the input voltage into a DC output voltage. The MOSFETs are controlled by the onboard PWM signal and the transistors are driven with a schottky diode for prevention of large losses. The STR05S12 also contains integrated safety features, such as input under-voltage protection, current limitation, over-temperature protection, and output short-circuit protection for safe and reliable operation.

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