LM34919TL/NOPB

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The LM34919TL/NOPB is a high power factor, single stage, non-isolated off-line buck regulator featuring innovative digital control and protections. The device includes essential features to control, deliver and protect power to AC-DC applications with output power up to 25W. Applications include communication infrastructure, industrial, home/building automation and digital signage.

The LM34919TL/NOPB is classified as a PMIC (Power Management IC) medium voltage regulator with a DC-DC switching regulator (buck regulator). The buck regulator is designed to take a given input voltage, usually a higher voltage, and convert it to a lower one for use in the application. Buck regulators are usually the most common type of voltage regulator integrated onto a Power Management IC (PMIC) as they are quite efficient and versatile.

The LM34919TL/NOPB buck regulator works by applying fixed operating frequency pulse-width modulation (PWM) to the IC’s internal power MOSFET (Metal-oxide Semiconductor Field-effect Transistor). The pulse width switched power is then sent to a transformer or other power operation device. The buck regulator continuously monitors both the output voltage and the input voltage and adjusts its duty cycle as needed to maintain the desired output voltage. It also incorporates a wide range of protections, such as over current and over temperature protection, to ensure safe and reliable operation.

Overall, the LM34919TL/NOPB buck regulator offers excellent power efficiency, protection and digital control with a single stage, non-isolated off-line solution designed for AC-DC applications with output power up to 25W. The highly integrated device combines all the functions needed to control, deliver, and protect a high power factor power supply, simplifying the design process and reducing component count.

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