BD9428

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BD9428 is an externally compensated three-channel constant current linear regulator, designed specifically to drive light-emitting diodes (LEDs). It is capable of driving up to 300mA (typical) through each of the 3 channels, and features an Input Under-Voltage Lockout (UVLO), Fault Protection, DIM pin voltage drop alarms, 64 steps of brightness control, and overvoltage protection circuit (OVP).

Application Field

BD9428 is primarily used as a current source for LEDs in backlight LCD modules, headlight and tail light modules, digital TVs, and other various LCD backlight applications. It can also be used for any other lighting applications that require a constant current source. It is suitable for 12V applications and can easily support a wide range of operating voltages from 5V to 26V. BD9428 is also capable of providing a reliable and efficient way of providing brightness control while also incorporating over-voltage protection.

Working Principle

BD9428 works using a linear topology in which a constant current is maintained by using an externally resistors to regulate the overall voltage. It features a high voltage integrated transistor that allows it to switch quickly, and thus enabling it to maintain a very precise and constant current. In addition, it offers independent dim pin control, which can easily be calibrated to match required brightness levels. There is also an over-voltage protection feature, which prevents the LED from being damaged due to an over-voltage fault. Furthermore, the BD9428 also provides an under voltage lockout, which can help protect the LED from being damaged due to an over-current condition.

Overall, the BD9428 is a very efficient and unique LED driving solution that is specifically designed to meet the needs of modern LCD backlight and lighting applications. It is capable of providing a reliable and efficient way of providing brightness control while also incorporating over-voltage protection.

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