Bluetoothß„? Front-end Ic T7024 Design Guide

Description: The HV9911DB2 is an LED driver designed to drive up to twenty 100mA LEDs in series from an input voltage range of 9 to 16V DC. This demonstration board utilizes Supertex's HV9911 integrated circuit (IC) in a boost converter topology. The converter exhibits excellent initial regulation of ±5% and superior line and load regulation across the entire input and output voltage range, typically within ±1%. The full-load efficiency of the converter exceeds 85%. Additionally, the HV9911DB2 is equipped with protections against open LED and output short-circuit conditions. It provides a high-performance PWM dimming response, with rise and fall times typically under 2 microseconds, enabling high PWM dimming ratios. The board features an ENABLE input that allows for shutting down the IC, resulting in minimal power consumption from the input. The switching frequency of the HV9911DB2 can be synchronized with other HV9911 boards or an external 200kHz clock by connecting the clock signal to the SYNC pin of the HV9911DB2. It also includes a 2.2 µF, 16V X7R ceramic chip capacitor (SMD1206) from Murata, specifically the GRM31MR71C225MA35L model.

The HV9911DB2 LED driver circuit is primarily designed for applications requiring efficient LED lighting solutions. The use of a boost topology allows the driver to efficiently step up the input voltage to the required levels for driving multiple LEDs in series. The HV9911 IC is a critical component, providing robust performance with its impressive regulation capabilities, ensuring consistent brightness across varying input voltage levels. The efficiency rating of greater than 85% indicates that the converter minimizes energy loss, a crucial factor in battery-powered or energy-sensitive applications.

Protection features such as open LED and short circuit protection enhance the reliability of the circuit, ensuring that it can operate safely under various fault conditions. The PWM dimming capability is particularly advantageous for applications that require adjustable brightness levels, such as in automotive lighting or architectural illumination. The fast rise and fall times of the PWM signal allow for smooth transitions in brightness, which is essential for visual comfort and aesthetic appeal.

The ENABLE input facilitates power management, allowing the device to enter a low-power state when not in use, which is beneficial for extending battery life in portable applications. The synchronization capability with other HV9911 boards or an external clock enhances flexibility in multi-channel applications, allowing for coordinated control of multiple LED drivers.

In terms of component selection, the inclusion of the Murata GRM31MR71C225MA35L capacitor ensures stability and performance of the power supply network, critical for maintaining the overall integrity of the LED driver circuit. The SMD1206 package size is suitable for compact designs, making the HV9911DB2 a versatile choice for modern electronic lighting solutions. Overall, the HV9911DB2 offers a comprehensive solution for driving high-performance LED arrays with excellent efficiency, reliability, and control features.The HV9911DB2 is an LED Driver capable of driving up to twenty 100mA LEDs in series from an input of 9 16V DC. The demoboard uses Supertex`s HV9911 IC in a boost topology. The converter has a very good initial regulation, (+/-5%), and excellent line and load regulation over the entire input and output voltage range (<+/- 1%).

The full load ef ¬ ciency of the converter is typically greater than 85%. The HV9911DB2 is also protected against open LED and output short circuit conditions. It has an excellent PWM dimming response, with typical rise and fall times less than 2 s, which will allow high PWM dimming ratios. The HV9911DB2 also features an ENABLE input which CAN be used to shut down the IC and allow a very small power draw from the input.

The switching frequency of the HV9911DB2 CAN be synchronized to other HV9911 boards or to an external 200kHz Clock by connecting the Clock to the SYNC pin of the HV9911DB2 2. 2 F, 16V X7R ceramic chip capacitor SMD1206 Murata GRM31MR71C225MA35L