PT4224C

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The PT4224C is a DC-DC converter designed for applications that require a wide range of input and output voltages. It is a non-isolated, step-down, synchronous buck converter that provides high efficiency, high power density, and a wide input and output voltage range. It is ideal for applications such as LED drivers, DC motors, and other industrial, automotive, and medical applications.

The PT4224C is a two-stage converter, consisting of a high-side, MOSFET, configuration, with an insulated output and an integrated low-side NMOS. It also includes an integrated, quasi-resonant pulse-width modulation (QR-PWM) controller. The integrated controller allows the converter to operate at higher switching frequencies with minimized system components. It also allows for tighter control of the output voltage, allowing for higher efficiency across the operating range.

The PT4224C operates in pulse width modulation (PWM) mode to control the output voltage. The external components needed for the converter include a Schottky diode, an inductor, and a few low value capacitors and resistors. The PWM controller tracks the voltage on the output side, and adjusts the duty cycle of the high-side MOSFET accordingly. At frequencies of up to 2MHz, the duty cycle is modulated to maintain the output voltage set point. The efficiency of the converter is high, up to 95%.

The PT4224C has a wide input voltage range of 3-33V and an adjustable output voltage range of 0.8-33V, adjustable via an external resistor divider. The maximum output current is 4A, with a pulse-by-pulse overcurrent protection. The converter also includes a thermal protection feature, designed to protect it from extreme temperature conditions. The enable pin is used to enable and disable the converter. If the enable pin is low, the converter will be disabled and will be in a low-power stand-by mode.

The PT4224C is a versatile and efficient DC-DC converter, suitable for a wide range of applications, from LED drivers to automotive and medical applications. Its wide input and output voltage range, high efficiency, and integrated, quasi-resonant PWM controller make it ideal for a variety of power conversion applications.

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