LM2734YQMKE/NOPB Application Field and Working Principle

Category: PMIC - Voltage Regulators - DC DC Switching Regulators

The LM2734YQMKE/NOPB is a high-powered DC-DC switching regulator device with a wide range of application fields. It is capable of regulating up to 10A of output current and has a large selection of input/output (I/O) voltage support, suitable for driving a variety of loads including Step-Down, Step-Up, Voltage-Inversion and Power-Factor-Correction (PFC) applications. The LM2734YQMKE/NOPB\'s switching frequency is adjustable, allowing the user to tailor the device\'s performance to the specific application.

Features and Applications

• Wide input voltage range (4.5V to 28V)
• Wide output voltage range (fixed 2.5V to 28V/ adjustable 0.8V to 28V)
• High output current up to 10A
• Programmable switching frequency (200kHz to 2MHz) for optimized power and interference immunity performance
• Inrush current limiting
• Adjustable power-good signal
• Internal soft-start and overload protection
• Single inductor Power Factor Correction (PFC) design
• Modular design with external MOSFET

The LM2734YQMKE/NOPB is a perfect device for all kinds of DC-DC applications ranging from distributed power supplies and voltage conversion to power factor correction, step-up/down and voltage inversion. It is particularly suited for driving LEDs in lighting applications. The device can also be used in automotive applications, along with other industrial equipment that uses DC-DC switching regulators.

Working Principle

The LM2734YQMKE/NOPB follows the standard principle of DC-DC switching regulator circuits. The device has a feedback loop that keeps the output voltage at the target level by comparing the actual voltage regulation output and the reference voltage. The reference voltage is usually derived from a resistive DAC or from an external reference voltage. The feedback loop will then switch on/off the primary switch (internal or external MOSFET depending on the application) as needed to maintain the set level. Whenever the primary switch is on, the input voltage is converted to a higher output voltage step by step and the output voltage is regulated by the feedback circuitry. Whenever the primary switch is off, the energy stored in the inductor is transferred to the output and the output ripple is minimized.

The LM2734YQMKE/NOPB uses Pulse-Width-Modulation (PWM) to control the primary switch, allowing the user to adjust the switching frequency, which helps optimize efficiency and minimize interference and EMI across the board. The device also uses an internal softstart circuitry to reduce the inrush current and and overload protection circuitry that provides a safe shutdown mode. The LM2734YQMKE/NOPB also includes a power good signal that allows the user to monitor the voltage regulation output.

Conclusion

The LM2734YQMKE/NOPB is a high-powered DC-DC switching regulator device capable of regulating up to 10A of output current and providing wide input/output voltage support. It has adjustable switching frequency, allowing the user to customize the device\'s performance to the specific application. The device is suitable for driving a variety of loads including Step-Down, Step-Up, Voltage-Inversion and Power-Factor-Correction (PFC) applications and is perfect for powering LEDs in lighting applications and some automotive and industrial equipment.