TLC5940NT

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The TLC5940NT is a monolithic integrated circuit that has been designed for constant current, low-voltage LED drive applications. This IC offers a high power supply efficiency, superior thermal performance and high efficacy points. It is capable of driving up to 12 constant-current strings of LEDs in a single power supply system.

The TLC5940NT is designed for powering and controlling multiple strings with independent current control, and can provide up to 10 A of total current. Its wide input voltage range of 5 to 25 V and an output current regulation range from 4 to 12.5 mA make it a suitable LED driver for use in a variety of LED applications.

The TLC5940NT can be configured to work in both the constant-current and constant-voltage modes. In the constant-current mode, it maintains a constant current without the need for reactive power. This mode is ideal for applications that require a constant light intensity and/or color, such as OLED/LED displays, signage, and general lighting. In the constant-voltage mode, the TLC5940NT is designed to dim the LEDs at a constant voltage, which is ideal for applications that require smooth dimming of the LEDs, such as momentary lighting or pulse-width-modulated displays.

The TLC5940NT is also designed for safe operation, offering current and thermal protection. It has a thermal fold-back protection, which reduces the output current in case of excessive temperature. Additionally, it includes a user-programmable limit on the total output current, providing additional protection against current overloads.

In terms of quality control, the TLC5940NT uses LED string diagnostics to ensure that the LED strings are operating optimally. It also provides support for current diagnostics and input voltage monitoring through in-line resistive divider networks.

Overall, the TLC5940NT is a comprehensive LED driver solution developed for constant current, low-voltage applications. Its wide input voltage range, high output current capability, independent current control, and diagnostic capabilities make it suitable for powering and controlling multiple strings of LEDs.

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