SP6128AEY-L

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The SP6128AEY-L is a DC/DC switching controller integrated circuit (IC) that provides regulated outputs to run various devices or circuits operating with different voltages. It is used to switch power between VCC_IO (Input voltage for Logic) and a range of output voltages. Designed for high efficiency linear switch-mode DC/DC converters, the SP6128AEY-L provides users with high reliability, cost-effective and power saving solutions.

Features

The SP6128AEY-L is a highly integrated DC/DC switching controller powered by a 5V differential voltage. It integrates five independent valley current sensing and two bidirectional gate drivers for high current MOSFETs. The device includes primary clock oscillator, voltage reference, temperature compensation circuit, PWM comparator with second order loop stability, and adjustable under-voltage lockout with hysteresis. It integrates several safety features like over-temperature, over-voltage/ under-voltage/ over-current/ OVP/ OCP protections.

The SP6128AEY-L has built-in high speed MOSFET drivers that ensure low loss operation, wide frequency response and fast transient response for transformer-based designs. The device also offers a programmable frequency range of 0.3MHz to 1.25MHz and an adjustable peak current sense with a voltage gain of 32. The high speed gate drivers on the SP6128AEY-L allows for a greater range of operating conditions.

Applications

The SP6128AEY-L is designed for synchronous buck and buck/boost applications. It provides high efficiency, low ripple operation and full protection features. It is suitable for small board space and high switching frequencies needed by a variety of designs. It can be used in high efficiency linear DC/DC converters such as laptop computer adapters, cellular phone chargers, battery-powered systems, and automotive power applications.

Working Principle

The SP6128AEY-L controls the output voltage level by regulating the on/off duty cycle of the switch it drives. It employs a current mode feedback control technique to ensure a constant output voltage and to reduce output voltage ripple. The device also includes an adjustable current limit circuit that allows for limiting the peak current going through the switch. This helps reduce losses due to high currents, which are particularly important in high frequency applications.

The SP6128AEY-L uses soft-start to limit inrush current at power-on. It also incorporates a current sense feedback voltage, which is proportional to the energy stored in the output inductor. This voltage can be monitored to implement features such as zero current flow at the outputs during off cycles. The device also features an internal temperature sensor that can be used to reduce maximum output current or to set an overload protection current limit at high temperatures.

The SP6128AEY-L also features a wide frequency range, adjustable peak current sense, and a fast response time. All these features make it ideal for synchronous buck and buck/boost applications. The device is protected from over-voltage, over-current, and over-temperature, making it a reliable choice for power applications.

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