TPS61120RSARG4

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TPS61120RSARG4 is a popular, advanced and highly integrated monolithic power management IC (PMIC). It is optimized for driving multiple LEDs and operating at up to 20 Volts by using constant frequency and quasi-resonant algorithms. This PMIC is widely used in a variety of applications, including LED kits, hotspots, and wireless communications products.

TPS61120RSARG4 is a multi-channel LED driver IC. The device typically works with 3.3V input voltage sources and supports a wide range of output voltage levels, up to 20V. It has up to 4 regulated current outputs, each for driving one or multiple constant current LED strings. It is capable of driving up to 128 LEDs serially on each output, and can provide output current up to 75mA. The on-chip thermal overload protection circuitry prevents overload and over temperature conditions, protecting the device and eliminating external thermal sense and control circuitry.

In addition to the LED driver core, the chip also includes a wide range of features, such as a low-drop linear regulator, an internal voltage reference source, a 10-bit programmable current limit protection, and controlling features supporting up to 4 independent PWM or DC input control signals for dimming or color control. Other features include a watchdog timer that generates a reset signal on detection of a fault and a Brown-out detector for under voltage protection.

The power controller in this IC uses the quasi resonant mode (QR) along with the constant frequency (CF) mode techniques to provide efficient power conversion. In the QR mode, the operating frequency is controlled by the QWM pulse width. By increasing the load, the operating frequency can be adjusted to maintain a constant efficiency level. In this mode, the switching frequency is continuously adjusted around the natural resonance frequency of the transformer and the leakage inductance. This helps reduce the losses associated with the switching and increases the efficiency of the power supply. In the CF mode of operation, the switching frequency can be programmed based on the load condition. The CF mode is used when the operating frequency has to be scaled to maintain a constant output power and efficiency.

In addition to the power conversion, this device also includes several protection features. It includes an integrated PSRSequence controller for sequencing and an under-voltage lock-out circuit with adjustable threshold. The device also provides over-voltage, over-temperature, and over-current protection as well as a host-level power disable signal. The device also features a bypass logic which helps to enable or disable the device during the start-up and shut-down procedures. This device helps to reduce component count, component size, and time to market.

In summary, TPS61120RSARG4 is an advanced and highly integrated PMIC. It offers a wide range of features and is ideal for driving multiple LEDs, as well as providing voltage regulation and efficient power conversion. Its multiple protection features make it suitable for a wide range of applications, such as LED kits, hotspots, and wireless communication products.

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