PT6718C

DC to DC converters are types of power supplies that convert a Direct Current (DC) source to a higher, lower, or reverse polarity DC voltage. They are frequently used for automotive, industrial, and consumer applications such as solar power systems, mobile device chargers, LED lighting, and more. One type of DC to DC converter is the PT6718C, used for applications requiring high power efficiency and low noise levels.

The PT6718C is a constant frequency, step down, buck converter, utilizing a synchronous rectification structure. The input voltage ranges from 4.5V to 36V, and the output voltage is adjustable from 0.8V to 32V. The unit has a peak efficiency of 92 percent, can reach load current up to 62A, and has a low output noise profile. The converter provides a variety of protection features, including over-current protection, short-circuit protection, over-voltage protection, and over-temperature protection.

The PT6718C uses a multi-mode architecture to adapt to different levels of current and voltage while maintaining high efficiency. This architecture allows the switching frequency to vary, which leads to improved efficiency and reduced switching loss at different operating points. The converter is also programmable, allowing different control modes, such as current mode or voltage mode, and the user can adjust the parameters to optimize the DC output.[1]

The working principle of the PT6718C is based on Pulse Width Modulation (PWM) control. This involves generating a rectangular waveform with two opposite polarities (high and low) by the switching device, and the width of one of these pulses is adjusted to control the output voltage. The PWM control of the PT6718C is based on a fixed frequency, and the buck converter provides a voltage step down by using a transformer on the secondary side. The transformer operates on the principle of electromagnetic induction. The transformer has a primary coil wound on one side and a secondary coil on the other. When a current passes through the primary coil, it generates a magnetic field that induces a current in the secondary coil, and the voltage is stepped down.

The PT6718C can be used in a variety of applications requiring high power and efficiency. These include AC/DC power adapters, LED lighting, industrial power supplies, motor drives, and more. It is also popular in battery powered systems, such as the EVs, HEVs, and UAVs. Due to its high efficiency and low noise profile, the PT6718C is well suited for these applications.

In summary, the PT6718C is a DC to DC converter used for applications requiring high efficiency and low noise levels. It is a constant frequency, step down, buck converter utilizing a synchronous rectification structure, with an input voltage range from 4.5V to 36V and an adjustable output voltage of 0.8V to 32V. The unit works on the principle of Pulse Width Modulation (PWM) control, using a transformer to step down the voltage on the secondary side. The PT6718C is suitable for applications such as AC/DC power adapters, LED lighting, industrial power supplies, motor drives, and battery powered systems.

References

[1] "PT6718C Datasheet - Richtek." Richtek. https://www.richtek.com/datasheet/PT6718/