L6598

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The L6598 is a popular integrated solution for low-power, low-noise, AC-DC offline switching power supplies. As a key component of the power management integrated circuit (PMIC) family, the L6598 is used to convert alternating current (AC) power into direct current (DC) power for general purpose applications. The device operates as an offline switch-mode power supply (SMPS) and offers high efficiency, low standby power consumption and low noise operation.

The L6598 is suitable for a variety of applications, including power adapters, uninterruptible power supplies (UPS) and LED lighting. It is a high-efficiency device that provides a complete system solution, thanks to the integration of several key components, including the high-side driver, control logic, power MOSFET and an internal oscillator. The device supports peak efficiencies of over 95%, making it suitable for low-power applications.

The L6598 provides excellent protection features, such as a hiccup over-current protection (OCP) and an auto-recovery over-temperature protection (OTP). The device also features a soft-start current generator, allowing for slower device turn-on and reduced start-up stress, thus increasing product lifetime. Additionally, the device can be used to implement remote on/off control for energy efficiency and safety.

In terms of working principle, the L6598 is a fixed-frequency current-mode SMPS with avoltage-mode control architecture. The device operates with a frequency of up to 400 kHz, allowing for easy implementation of a multi-mode operation. The device also offers an adjustable frequency for improved transient response and higher overall efficiency. It is designed for single-ended primary-inductor converters (SEPIC), which are used in isolated power supplies.

At the heart of the L6598 is its power stage, which utilizes a high-side switching MOSFET and low-side switch, both controlled by a constant current circuit. The MOSFETs provide filtering and isolation of the AC mains, and the low-side switch reduces the voltage ripple of the output. The device is optimized to drive a high-speed transformer across switch-mode power supply rectifiers, facilitating greater load currents and higher efficiency.

The L6598 also offers integrated clock oscillator control for improved start-up times and reliable output regulation. The device can achieve up to 4 W output power and can support up to 98% efficiency, making it an ideal solution for powering a wide range of home and office electronics. Additionally, the device can support up to 11 MHz switching frequency and up to a 0.9 µs response time, eliminating the need for external clock oscillators.

In summary, the L6598 is a versatile and feature-rich AC-DC offline switch-mode power supply device. It provides superior protection features, excellent efficiency, and low noise operability for a variety of general purpose applications. The device is suitable for implementing remote on/off control and can support up to 4 W output power with greater than 95% efficiency. Its integrated clock oscillator control eliminates the need for external clock oscillators, increasing system efficiency and power dissipation. As a result, the L6598 is a reliable and cost effective solution for many low-power AC-DC conversion applications.

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