LT3517HFE#PBF

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PMIC - LED Drivers refer to power management integrated circuits (PMICs) that employ a wide range of electrical and electronic components for driving or controlling LED lighting components. LT3517HFE#PBF is a LED drivers from Linear Technology suitable for use in portable equipment and computer memory systems. It is a high-efficiency step-up DC/DC in package converter specifically designed for portable device applications.

Applications

LT3517HFE#PBF is suitable in applications such as portable battery-powered systems, computer memory systems, automotive circuits, and consumer electronics. The device’s output current can be up to 1.0A and the input voltage can range from 0.8V to 10V. It also has adjustable soft start and adjustable current limit which make it efficient in providing output power to a wide range of loads. Additionally, its PWM control capability allows it to be used in pulse duration modulation (PDM) circuits.

The LT3517HFE#PBF is also ideal for consumer applications such as providing lighting for backlighting LCD displays and powering LED indicators. The device has an internal voltage regulator and high-voltage buck converter that provide good thermal control, allowing devices to be maintained at a constant temperature. The high-efficiency converter supports up to 1.5MHz operating frequency, and it also supports peak currents up to 2A. The LT3517HFE#PBF also implements short-circuit protection (SCP) which can shut down the device when the current exceeds the set limit.

Features

LT3517HFE#PBF offers many features that make it an ideal choice for LED drivers. The device has a wide input range from 0.8V to 10V. It offers up to 1.0A output current, output current monitor and dim control. The device also has adjustable current limit and adjustable soft start. Additionally, the PWM control provides an adjustable switching frequency from 250kHz to 1.5MHz. The architecture also supports 3000V isolation voltage, power-saving sleep mode, and current limiting.

Working Principle

The LT3517HFE#PBF is a step-up DC/DC converter. It includes a power transmission stage and a voltage regulation stage. The power transmission stage consists of power transistors and power diodes. The voltage regulation stage includes voltage reference, PWM limit, Amplifier, and control stage. The voltage reference establishes the desired output voltage. The PWM limit signal is compared with an internal signal and it determines the time the power transistors remain ON. The amplifier compares the voltage reference and the output voltage and provides feedback to the control stage. The control stage takes the feedback from the amplifier and adjusts the ON timing pulses accordingly. The pulses ON/OFF enable the power transistors, thereby regulating the output voltage.

With the help of the internal voltage regulator the LT3517HFE#PBF provides good thermal control over the LED\'s temperature. The high-efficiency buck converter operates at device switching frequency up to 1.5MHz. The device can be used for slow-start and low-ripple operation and for powering LED indicators. In addition, its short-circuit protection (SCP) can limit the current and protect the device from damage due to overload.

Conclusion

LT3517HFE#PBF is an ideal solution for LED drivers. The device offers high efficiency, wide input range, adjustable current limit, adjustable soft start, and short-circuit protection feature. The LT3517HFE#PBF is suitable for use in portable devices and computer memory systems. Plus, its internal voltage regulator and high-efficiency buck converter provide good thermal control while operating at up to 1.5MHz device switching frequency.

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