L6910TR

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The L6910TR voltage regulator is a DC-DC switching controller designed for off-line standby power supplies (SPS). It is an integrated circuit that uses pulse-width modulation (PWM) to efficiently regulate the transfer of power from a DC source to a DC load. The device combines the advantages of a low-cost PWM controller IC with the robustness of a MOSFET-level controller in one integrated package.

The L6910TR voltage regulator is well suited for applications such as switchers, AC-DC adapters, off-line SPSs, LED lighting, and DC-DC converters. Its main features are an adjustable PWM frequency of 100KHz to 1MHz, and a maximum switching current of 500mA. It has a low supply voltage range of 5V, and 3.3V optional, making it an ideal solution for small off-line systems.

In terms of its operating principle, the L6910TR voltage regulator works by controlling the output voltage of a switcher based on the command of its internal current-mode regulator. It converts a reference signal from an external reference into an internal reference by using an internal oscillator and/or a external PWM. This command is compared with the sensed feedback voltage, which is sensed internally by a precise sample and hold circuit. The result is a precise output voltage under all conditions, including power line input transients, temperature drift, cycle-to-cycle, and load transients.

In summary, L6910TR voltage regulator is a multi-functional, cost-effective, and integrated solution for applications that require high efficiency, precise regulation, and reliable operation. It is designed for a wide range of voltage and current settings from 5V to 44V and from 0.5A to 500mA. Its current-mode operating principle ensures it can maintain precise regulation at high switching frequency and high load current. Furthermore, its wide input voltage range, low supply voltage requirements, and high output power make it an excellent choice for off-line systems.

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