PT78NR105H

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DC-DC converters are electronic components that convert one DC voltage level into another. The PT78NR105H is a synchronous step-down DC-DC converter designed for cost-sensitive applications in low power, space-constrained environments. It is capable of delivering up to 2 A of continuous output current over the input range of 4.5V to 36V.

The PT78NR105H has a fixed-frequency (300 kHz) PWM control with an integrated power switch, which reduces component count and board area. It operates in two modes: current-mode or voltage-mode control. This provides more flexibility for the user to optimize the system efficiency and EMI behavior. It supports input voltage up to 36V and can step down voltage to a regulated output of 0.8V to 8V with an adjustable output voltage range. The adjustable output voltage range can be set using the internal voltage divider or an external trim. It also includes integrated features such as enable control, soft-start, cycle by cycle current limit and short circuit protection.

The PT78NR105H uses a synchronous rectifier to minimize power dissipation, providing up to 95% efficiency. It also features low component count and a host of protection functions, reducing system complexity, saving space and cost. The 0.8mm low profile package allows for better overall system reliability and cost savings based on the number of external components required.

One of the most common applications of the PT78NR105H is for powering microprocessors, digital signal processors, FPGAs and ASICs. It has been designed to provide adjustable core supplies from fixed input voltage sources. It is also suitable for powering DDR3 and DDR4 memory modules, providing clean and noise-free power. The PT78NR105H can be used in mobile phones, set-top boxes, network servers, LED Drivers, automotive head-up displays and many other power sensitive applications.

The working principle of the PT78NR105H is fairly simple. The input voltage is fed to a switching regulator in order to produce the output voltage. The switching regulator is composed of an inductor, a power switch, and an output capacitor. The power switch is turned on and off according to the input voltage, and the inductor stores and releases energy in the form of a current burst in order to produce the output voltage. The output capacitor is used to stabilize the output voltage, and the output voltage regulation is maintained by the control loop, which is composed of the power switch, the inductor, and an error amplifier.

In summary, the PT78NR105H is an efficient, cost-effective, and space-saving DC-DC converter. Its low profile package makes it suitable for powering microprocessors, ASICs, and other power sensitive applications. The PT78NR105H provides adjustable core supplies from fixed input voltages sources, and it can be easily integrated into existing designs without current limit or circuit protection. It is capable of delivering up to 2 A of continuous output current over the input range of 4.5V to 36V, making it one of the most reliable and versatile DC-DC converters on the market today.

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