78ST136VC

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DC-DC converters are used to convert a source of direct current (DC) from one voltage level to another. The 78ST136VC is suitable for use as a voltage regulator and motor drive. This article will discuss the application field and working principle of the 78ST136VC.

Applications

The 78ST136VC is a voltage regulator and motor drive which is compatible with field-oriented control (FOC). Common applications of FOC include motor control in industrial drive systems, power supplies, and other electronic inverters. The 78ST136VC is a current-mode, step-down, DC-to-DC converter designed for driving brushless three-phase motors. It is capable of controlling high-power motors in industrial applications, providing the features and robustness needed.

The 78ST136VC is also well-suited for use as a voltage regulator in industrial and embedded applications. It is compatible with a wide range of input voltages, from 36 to 75V. It can also regulate output voltage over a wide range, from 0.5 to 36V. Its advanced protections features protect the system against overload and short circuit. Its high efficiency makes it suitable for many applications, including automotive, telecom, and industrial.

Working Principles

The 78ST136VC is a pulse-width modulation (PWM) chip which uses current-mode control to regulate voltages. It works by monitoring the output voltage with an internal voltage divider and comparing it to a desired reference voltage. When the two voltages differ, the PWM logic output instructs the MOSFETs switch to drive the motor windings.

The 78ST136VC is equipped with various protection systems and other features to ensure safety and reliability. These features include over-temperature protection, overload protection, and short circuit protection. The chip also features modulation frequency limiting and current limiting, which protect against unexpected changes in the current and voltage due to load spikes.

The 78ST136VC also features a frequency compensation circuit to ensure stable performance. This circuit senses changes in the power supply voltage and adjusts the modulation frequency of the device accordingly. This helps to maintain stable output voltage, even in applications where the supply voltage changes throughout the day.

In addition, the 78ST136VC features an adaptive failing frequency protection system which prevents it from overdriving the motor. This prevents any damage to the motor windings, and thus extends its lifetime.

Conclusion

The 78ST136VC is a versatile DC-DC converter which is suitable for use as a voltage regulator and motor drive. It is compatible with a wide range of input and output voltages, and features advanced protection systems to protect the motor and the system against overload and short circuit. Its frequency compensation circuit and adaptive failing frequency protection help to maintain a stable output voltage and protect the motor from damage, respectively.

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