Silan Microelectronics has introduced a high-performance, high-reliability, high-power green lighting driver solution core chip - 6-36V input, 1A high-power LED driver chip SD42524. The chip is a step-down, constant current drive, power switch built-in power LED driver chip. The technology used represents the development direction of Silan Microelectronics green energy-saving technology, with high conversion efficiency, integrated PWM dimming technology and Multiple protection functions, convenient application, can be widely used in a variety of LED lighting fields.
The SD42524 uses current mode control with fast transient response, simple loop stability design, and good constant current characteristics. When the input voltage changes between 6 and 36V or the LED load changes from 1 to 6, the output current rate of the chip can be controlled to ±1%, which is convenient for customers to set the output current under different voltage applications or LED load applications. . Since the chip adopts the 36VBCD process technology of Silan Microelectronics and uses high-precision trimming technology internally, the output current of the chip is consistent, and the output current rate of different batches can be controlled within ±2%. .
The chip uses an advanced system architecture, high system efficiency, and conversion efficiency of up to 96%. The chip integrates an LDMOS power transistor based on Silan Microelectronics' unique BCD device process technology. The LDMOS transistor has an ultra-low on-resistance of 0.4Ω, which reduces the conduction loss of the chip during the on-time of the power transistor. The chip has the lowest sampling frequency of 88mV in the same industry, which greatly improves the energy conversion efficiency of the circuit. Due to the high efficiency of the chip and the package form of SOP8, the die has low heat generation and excellent heat dissipation performance.
The SD42524 uses PWM dimming and internal voltage regulation. The precision of PWM dimming is high. Compared with analog dimming, there is no LED color shift, which can meet the dimming requirements from 0 to 100% in the range of 100 Hz to 2 kHz. The integrated LDO inside the chip generates VDD voltage, which can be used as the power supply for the MCU for dimming, making the customer more convenient in the system development process.
In addition, the chip has a built-in frequency-hopping function to ensure that the internal oscillation frequency of the chip is dithered in a small range, so that the concentrated spectrum energy is dispersed, and the external radiation at a single frequency is reduced, thereby improving the EMI characteristics of the system. Simplified EMI design. In addition, the chip integrates multiple protection circuits such as temperature protection circuit, thermal compensation circuit and current limiting circuit to ensure the normal working environment of the LED lamp and prolong its service life.
The chip can be used in typical applications such as DC input and AC input. In typical DC input applications, the wide input voltage range is 6V to 36V wide and can output up to 1A. When the input voltage is 24V, 6 LEDs can be connected in series. There are very few external components in the system, only 7 components are needed, which is very suitable for 24V power system. In a typical application of an AC input MR16 spotlight, the input voltage range is AC12 to 24V, requiring only 11 peripheral devices.
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