PT6707C

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DC-DC converters are devices that convert direct current (DC) from one voltage level to another. They are primarily used to regulate an output voltage from an input voltage, or control an output current from an input current. In this article, we will discuss the application fields and working principles of PT6707C, one of the leading DC-DC converters in the market.

The PT6707C is a three-terminal synchronous step-down DC-DC switching regulator. It integrates a low-noise high-speed buck (step-down) switch and wide voltage range input capacitorless buck converter. Thanks to the device’s 30V input voltage range, current output up to 5A and power efficiency up to 93%, the device is suitable for applications requiring a wide range of input voltages and high output currents.

The input voltage range of PT6707C is 4.5V to 30V, making the device suitable for automotive, industrial, and diverse consumer applications. Its integrated MOSFETs eliminates the need for an input capacitor, and the output is programmable by a single resistor. The device provides accurate output voltage control and is ideal for use in battery powered and USB-powered applications, due to its low dropout voltage, low quiescent current, and high efficiency.

PT6707C contains both voltage loop and frequency control to regulate the output voltage within 0.8% accuracy across temperature. The PWM frequency can be programmed from 300kHz to 2.2MHz and is spread spectrum-enabled along with output soft-start for no-load conditions. The device also provides selectable power-good delay, short-circuit protection, over-temperature protection, and thermal shutdown protection. Together, these features make the PT6707C an ideal choice for applications with high power-margin requirements and tight loop regulation.

At the heart of the PT6707C is a synchronous buck converter system. Buck converters are power conversion circuits that convert a higher input voltage to a lower controlled output voltage. The circuit works by switching power transistors (MOSFETs or BJTs) to convert the DC voltage level when driven by a pulse-width modulated (PWM) signal. The PWM signal is generated by an oscillator to switch the transistors and output the correct voltage level.

In this system, the power MOSFETs work in a synchronous mode, meaning that they are both turned on at the same time. The output voltage is controlled by adjusting the duty cycle of the PWM signal. A higher duty cycle means a higher voltage output, while a lower duty cycle corresponds to a lower output voltage. The voltage regulation loop ensures the output voltage is accurate even with changing conditions.

The PT6707C offers a wide range of protection features to ensure safe operation. It has multiple integrated protection circuits, such as over-current protection (OCP), over-temperature protection (OTP), and under-voltage protection (UVP). The OTP circuit limits the maximum operating temperature of the MOSFETs, while the UVP circuit guards against too much current, which could damage the device. These features ensure reliable operation even under worst-case conditions.

The PT6707C is designed for a wide range of automotive, industrial and consumer applications. It is ideal for battery-powered and USB-powered applications due to its high efficiency and low dropout voltage. It is also suitable for applications requiring a wide range of input voltages and high output currents. In addition, its integrated protection features guarantee safe operation, even in the harshest of environments.

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