TPS61325YFFR

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The Texas Instruments TPS61325YFFR LED driver belongs to the category of PMIC - LED Drivers. It is a two-terminal device supporting constant current and/or constant voltage applications. It is an integrated solution for direct driving multiple LEDs, as well as maintaining a constant current to theLEDs throughout their life. It is especially useful in applications where battery usage efficiency is needed and the run time or cost needs to be minimized.

The TPS61325YFFR utilizes the Rad-Hard Multi-Layer pin driver topology, which provides high output current capability up to 50mA, 500kHz switching frequency and enhanced electro-static discharge (ESD) robustness for the pin configuration. With an operating temperature range of -4°C to +85°C, the device supports up to 5.5V input voltage range of 1.21V to 5.5V and provides good efficiency and small size as compared to alternative solutions. It also has a low shutdown current of 1uA and a wide output voltage range from 0.4V to 2.6V.

It has a wide range of application fields, like: automotive lighting, industrial lighting, architectural lighting, backlighting, intelligent lighting and signage lighting. The key features of TPS61325YFFR are high accuracy, low noise, and high ESD robustness. Moreover, its small form factor makes it suitable for space constrained applications. It is available in Mini DFN-10 and SOT-25 packaging.

The working principle of TPS61325YFFR is based on pulse-width modulation (PWM) control, which can be configured internally or externally. The high-side and low-side switches function as an adjustable duty cycle oscillator. The current through the LEDs is controlled by an external capacitor value, which is determined by a precise resistive divider connected to the REF pin of the device. The REF pin can be connected to a DC voltage source or to an AC signal.

TPS61325YFFR features a slew rate ramp-up timer. This function helps prevent the midsupply voltage voltage from increasing abnormally during the PWM control and improve system reliability. The slew rate control is enabled by an internal delay timer and a current sense resistor. The RMS current level can be adjusted by changing the signal duty cycle.

In addition, the TPS61325YFFR has a low-side startup delay timer, which helps prevent the load current from increasing too quickly during startup. The timer offers a tOFF(start) delay of 4.9uS typical, selectable from 3uS to 7.2uS, which can improve robustness of the system by eliminating start-up overshoot and inrush current issues.

Moreover, the device supports a low power-startup algorithm with a maximum current limit of 6mA, which helps reduce system power consumption during startup.

Furthermore, the TPS61325YFFR features external soft-start circuitry, which helps prevent inrush current when the LED loads are connected to the rail. This circuitry performs the slow-start using an external capacitor to control the ramp up of the average current on the LED loads.

Finally, the device includes an over-temperature protection (OTP) mechanism, which reduces the current limit or shuts down the output as needed. This mechanism helps prevent any damage due to over-temperature conditions.

In conclusion, the Texas Instruments TPS61325YFFR LED driver belongs to the category of PMIC - LED Drivers which is an ideal solution for direct driving multiple LEDs and maintaining a constant current to the LEDs throughout their life. The integrated Rad- Hard multi-layer pin driver topology provides high efficiency and small size, supported by advanced features such as a low shutdown current, slew rate ramp-up timer, low-side startup delay timer, low power-startup algorithm, external soft-start circuitry, and over-temperature protection.

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