TPS61280AYFFT

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TPS61280AYFFT Application Field and Working Principle

TPS61280AYFFT is a DC/DC switching regulator from Texas Instruments that offers an integrated smart boost converter. Typical application areas include portable computing and small host systems, building automation, hand-held and industrial equipments, battery-powered systems and embedded systems.

The switched capacitor design of TPS61280AYFFT allows for output of up to 200V with over-current and short-circuit protection to ensure safe operation. Its adjustable output voltage from 0.9V to 5.6V with up to 0.5A current capability makes it well-suited for high current applications. This integrated DC/DC regulator requires only a few external components and offers high efficiency and fast transient response, as well as a high degree of protection through built-in thermal shutdown. It is able to achieve low ripple and fast transient response by changing its output voltage in steps of 10mV.

Functional Description

The TPS61280AYFFT is an adaptive on-time DC/DC converter with a high side N-Channel MOSFET switch, which could generate output voltage from 0.9 to 5.6V. For a safe output voltage, the IC offers adjustable peak current limit (Ipeak) and adjustable low-side switch current limit (Ilim). The device features a fixed switching frequency at 1.3MHz and its functional diagram shows the voltage regulation process and the operating principles of the IC.

The TPS61280AYFFT is designed to provide an accurate regulated output voltage with a step size of 10mV that is adjustable through an external resistor network. In normal operation, an external MOSFET is employed for the high-side switch. The switch is controlled by the IC and turns on and off in response to the output voltage. When the switch is on, the output voltage is regulated by the on-time control.

When it is sensed that the output voltage has reached the target value, current-limit control allows the output voltage to be regulated according to the current-limit. When the maximum current-limit value is reached, the output voltage is held at the target value and the current-limit control is disabled. For balanced loading of the high-side switch, each cycle is adapted to the output voltage.

Protection

The TPS61280AYFFT features several protections for safe operation, such as adjustable current limit and over-voltage protection. For short-circuit protection, the device features an internal switch current limit, which limits the current-flow on the switch node to a safe level. It also includes an adjustable output voltage detection circuit, which can detect and protect against an over-current situation at light-load conditions.

In addition, the device includes an adjustable under-voltage protection that limits the output voltage when the voltage drops below a certain level. This allows the TPS61280AYFFT to reduce the output voltage in order to prevent the device from being damaged. The device also features a built-in over-temperature protection, which takes into account the temperature of the device and shuts it down when the temperature reaches a certain limit.

The safety features on the TPS61280AYFFT allows the device to be used in a wide range of applications, from those that require high currents to those that require low-voltage protection. The features ensure that the device will remain safe and reliable, even under extreme conditions.

Applications

The TPS61280AYFFT is suitable for a variety of applications, including portable computing, small host systems, building automation, hand-held and industrial equipments, battery-powered systems and embedded systems. It offers a high degree of protection against over-voltage, over-current and over-temperature conditions. With its high efficiency and fast transient response, the TPS61280AYFFT makes an ideal choice for a range of power applications.

The TPS61280AYFFT is a reliable and cost-effective solution that offers a wide range of features and performance characteristics. Its adjustable output voltage, adjustable current limit and built-in thermal shutdown ensure safe and reliable operation in a wide range of applications.

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