TPS61041DRVRG4

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The TPS61041DRVRG4 is a Texas Instruments (TI) PMIC-LED Driver. This IC is a combined Boost Converter and High-Side MOSFET Driver IC, used to control LEDs in applications such as automotive lighting, general lighting, and flat panel displays. The TPS61041DRVRG4 leads the LED current as a current source, minimizing LED voltage variation across the line. Besides offering a high step-up voltage conversion ratio (2.8V to 42V), the device requires no blocking or freewheeling diodes, and provides an overcurrent protection.

The above features make the TPS61041DRVRG4 IC suitable for the following applications:

• Automotive applications such as tail lamps, interior lighting, and ambient lighting
• General lighting including spot lights and track lighting
• Flat panel displays

The working principle of the TPS61041DRVRG4 is based on the Buck-Boost converters, which suffer from a stability problem arising from the combination of the dominating the parasitic elements of the inductor and MOSFET. This issue is resolved by controlling the current through the inductor through the chip’s integrated current sense amplifier, which is connected to the positive terminal of the inductor. This eliminates the need for a separate current sense element. The device is best suited for applications requiring high efficiency and low input voltage, as the TPS61041DRVRG4 can provide up to 84% efficiency in a 1.2V to 9V input range. The device also includes a low side MOSFET, feedback voltage divider and a boost inductor, making it a complete solution for LED driving.

The control loop of the TPS61041DRVRG4 has four distinct blocks, namely: the voltage loop, current loop, the MOSFET driver and the internal oscillator. The voltage loop is responsible for controlling the output voltage, based on an external feedback signal. The current loop is used to regulate and monitor the current through the LED, by sensing the voltage drop across the current sense resistor. The MOSFET driver provides a PWM duty cycle to the MOSFET gate, which varies with the duty cycles and load conditions. The internal oscillator controls the oscillator frequency required to control the PWM duty cycle.

The TPS61041DRVRG4 offers bidirectional current flow patterns, depending on the operating mode. In the boost mode, the current flows from the input source, through the internal oscillator, and into the output. In the buck-boost mode, the current flows from the output of the switching element, to the input source. The device also features an overcurrent protection, which shuts down the MOSFET upon experiencing an over current, thus protecting the load from degradation.

In conclusion, the TPS61041DRVRG4 is a high performing PMIC-LED driver IC, suitable for automotive lighting, general lighting, and flat panel displays applications. It implements a boost converter and high side MOSFET driver, with a built-in over current protection circuit. It has a high step-up voltage conversion ratio, requires no blocking or freewheeling diodes, and is best suited for applications requiring high efficiency and low input voltages. This makes it the perfect choice for LED lighting applications.

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