SP6682EU-L/TR

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The SP6682EU-L/TR is a high-rate, high efficiency fixed frequency current mode step-up converter from Shenzhen Prechip Electronics Co., Ltd. It is categorized as a PMIC - LED Drivers for its application field and working principle.

The SP6682EU-L/TR is designed for LCD backlight and LED charge-pump applications. It integrates a voltage-to-current (V-I) conversion circuit, a high speed PFM control, an adjustable current limit, as well as low maintenance, low target, high power, and cost effectiveness. Its main purpose is to provide a fully programmable, low-noise output current for LED illumination systems. It adopts V-I conversion technology, with differential sense input loop control, to ensure a highly stable LED current.

The SP6682EU-L/TR LED Driver is based on a fixed-frequency current-mode control architecture for higher efficiency and improved compensation flexibility. It also supports adjustable switching frequency and soft-start, making it suitable for use in mobile devices. The SP6682EU-L/TR can also be combined with synchronous rectification chips to improve system efficiency.

The SP6682EU-L/TR provides a constant current output with an internal over-current protection and a switching transistor protection. Its peak inductor current protection limits the inductor current to protect the device when the peak load current is higher than the device’s maximum current limit. The peak inductor current control also ensures that faster turn-off time is achieved, leading to higher thermal efficiency.

The SP6682EU-L/TR has a complete protection system including short-circuit protection, over-current protection and thermal shutdown protection to protect the device against fault conditions. The over-temperature protection is designed to ensure the device’s safety in case of excessive temperature or any other fault conditions. This eliminates the need for an external temperature sensing system.

The SP6682EU-L/TR’s operating efficiency is maintained within a wide input voltage range, from 2.7V to 6.5V. Its output voltage can be programmed from a 0.9V to a maximum of 4.5V, making it suitable for driving LEDs with a wide dynamic range of voltages. Its dynamic input voltage supports a range from 1.2V to 5.5V, allowing the device to be used in a wide variety of battery-powered applications.

The functioning of the device is simple and efficient. When the input voltage is higher than the output voltage, the device switches on the transistor in order to keep a constant duty-cycle. This is the basic working principle of a step-up converter. The converted current is then passed through the LED string, providing a constant voltage for the LED’s illumination. With the combination of a temperature-compensation network and the adjustable soft-start function, the device can be adjusted for different LED’s current requirement.

The SP6682EU-L/TR is an ideal device for low to mid-power LED lighting applications, including LCD backlight, LED signage and LED lighting systems. With its excellent features such as its high-rate, high efficiency, adjustable soft-start, adjustable peak iinductor current protection and temperature-compensation, this device is well suited for applications with stringent requirements on power management, efficiency and cost effectiveness.

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