in this video number {925} LED driver circuit using LIS9412, i explained Non-isolated step-down LED driver controller. Patented CCM working mode, Feed-forward current sampling without burning lamp beads, Over-temperature current foldback function, The most streamlined system structure, No input/output electrolytic operation, Input / Output Voltage "Zero" Distance, Integrated high-voltage start-up and high-voltage power supply functions, Integrated leading edge blanking (LEB), Integrated inductance compensation function
overview
LIS9412 is a control chip dedicated to LED constant current drive. It is suitable for step-down non-isolated applications. By adopting a number of patented control technologies, the system architecture has been simplified to the greatest extent. LIS9412 works in the inductor current continuous mode, no output filter capacitor is needed, and the ripple current of the load can still be kept at a low level; at the same time, compared with the current discontinuous mode, the peak current is smaller and the effective current is smaller, so the device loss is lower. The system can easily reach an efficiency of more than 95%. LIS9412 adopts the patented output constant current technology to ensure that the output current does not change with the inductance and the voltage of the LED light string, and achieves excellent load regulation. LIS9412 integrates high-voltage start-up and high-voltage power supply functions, without the need for start-up resistors or power supply windings. LIS9412 also integrates complete protection functions, including cycle-by-cycle overcurrent protection of input current, open-circuit protection of current detection pin, IC over-temperature regulation function, and short-circuit protection of output terminal, etc.

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00:00 LED driver circuit explained
01:02 LIS9412 led driver ic datasheet explained
01:24 CCM led driver circuit diagram
01:53 how LED circuit works