LM5021MMX-1/NOPB

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The LM5021MMX-1/NOPB is a monolithic switching regulator controller from Texas Instruments. It is a part of their Power Management Integrated Circuit (PMIC) range, specifically in the category of AC/DC converters and offline switchers. It is an offline current-mode wide input voltage range switching regulator controller.The LM5021MMX-1/NOPB is designed for off-line primary-side regulation applications powered from a wide input voltage range. The device detects the absence of the rectified mains sinusoidal peak and then accurately adjusts the current conduction time of the associated power switch to maintain the output voltage.The LM5021MMX-1/NOPB integrates a low-RDS( ON ) current-mode driver, error amplifier, and oscillator in a very small package. The wide input voltage range allows the regulator to operate directly from the rectified universal ac line voltage. The LM5021MMX-1/NOPB also features an active current limit indicator which can be used to minimize the switch size. The integrated frequency compensation circuitry allows the user to minimize the size of external components and adjust the device to suit the desired application.The LM5021MMX-1/NOPB works in the current mode to provide the necessary control of output voltage. Compared to the other control methods, the current mode has drawbacks but also provides unique benefits such as cycle-by-cycle peak current limit and excellent load and line regulation.For start-up, the LM5021MMX-1/NOPB works as a peak current-mode (PCM) controller with a maximum peak current limit of 700mA. The maximum peak current limit is programmable using the external sense resistor. When the device starts up and the input voltage rises above it\'s lower operating threshold, the external startup capacitor slowly releases the stored charge and the LM5021MMX-1/NOPB works in the Continuous Conduction Mode (CCM). The LM5021MMX-1/NOPB has several protection features to ensure system reliability. The device features over-voltage protection, short-circuit protection, and maximum peak current limiting.The LM5021MMX-1/NOPB is suitable for use in offline applications, such as battery chargers, AC/DC adapters, and power supplies. The device is available in a small 8-pin half-size VSSOP (very thin shrink small outline package) package, which allows it to fit space-constrained applications.In conclusion, the LM5021MMX-1/NOPB is an ideal solution for off-line power applications that require high performance and reliability while being compact in size. With its optimized power conversion efficiency, low-RDS( ON ) current-mode driver, error amplifier and oscillator and many protection features, the LM5021MMX-1/NOPB is an excellent choice for many applications.

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