NCP1253BSN65T1G

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PMICs are power management integrated circuits designed to address the power needs of complex and multi-power electronics products. NCP1253BSN65T1G is part of NXP\'s power management (PMIC) lineup and is part of the AC-DC converter, offline switcher family of PMICs. It is a 450 mA CMOS switch current mode-offline-switcher with primary side regulation optimized for small form factor flyback applications.

NCP1253BSN65T1G is used in applications such as regulated switch-mode-power-supplies (SMPS) for products in the computing, audio, DVD/Blu-ray, set-top box, industrial, and automotive markets. With a primary side control function, it eliminates the need for secondary side control loop, thus reducing part count and bill of materials cost. Its fast, pulse by pulse current limit protection, short circuit protection, and a comprehensive fault protection make it suitable for many high-performance power supplies.

Features and Benefits
NCP1253BSN65T1G is a versatile PWM switcher with a wide range of features and benefits that make it ideal for applications in the computing, audio, DVD/Blu-ray, set-top box, industrial, and automotive markets.

• High Efficiency: With an integrated 45V/450mA power MOSFET, it enables high efficiency with improved converter operation.
• Low Standby Power: The device features low standby power consumption and low start up current, making it ideal for applications requiring low standby power.
• Compact Heatsink: The integrated heatsink makes the device more compact, allowing more space for other components in the power supply design.
• Fast Transient Response: The device offers fast transient response, enabling it to react quickly to sudden load changes and minimize output voltage overshoots.
• Soft-Start: The device features a soft-start mechanism to gradually reduce inrush current and protect the attached components.
• Fault Protection: The device offers a comprehensive fault protection, reducing the risk of damage due to overload or short circuit.

Working Principle
NCP1253BSN65T1G is a CMOS-based current-mode-offline-switcher for primary side regulation. The device uses an input voltage and applies it to the primary side MOSFET, which is capable of switching up to 45V and 450mA. The gate of the MOSFET is driven by an internal high-frequency oscillator, in order to modulate the on-time to regulate the output voltage. The oscillator frequency is adjustable, allowing flexible design of the power supplies.

The device also features a wide wide frequency range of up to 350kHz, enabling it to switch MOSFETs faster, thus increasing the power efficiency of the power supply. Additionally, the device also includes a closed loop control mechanism, which monitors the output voltage and adjusts the primary side MOSFET to maintain a constant output voltage. The device also includes protection functions such as under-voltage-lockout (UVLO) and over-voltage-protection (OVP).

In summary, the NCP1253BSN65T1G PMIC is a versatile power management IC specifically designed for AC-DC converter, offline switcher applications. With its high efficiency, low standby power, and a range of fault protection capabilities, it is an ideal solution for applications in the computing, audio, DVD/Blu-ray, set-top box, industrial, and automotive markets.

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