TPS53127RGER

TPS53127RGER is a DC-DC switching controller, specifically designed to implement power factor corrected buck power supplies with high efficiency. With its continuous conduction mode, characteristic and advanced burst-mode control, the TPS53127RGER controller makes possible to reduce power consumption in applications such as portable computing and telecommunications equipment.

Application Field

TPS53127RGER is designed for architectures where a main buck controller configured as a continuous conduction mode supply operating in current mode control. This buck power supply is used to regulate input voltage to an outstanding level above the maximum output voltage required by the system. TPS53127RGER can also be used with other synchronous rectifier cascade configurations, such as cascading two controllers in forced continuous mode. It finds application in portable device power systems such as those found in notebook computers and mobile phones.

Working Principle

The TPS53127RGER is a ‘pulse-skipping’ DC-DC switching controller. In this type of control, the controller utilises a fixed off-time, ‘pulse-skipping’ control algorithm to regulate supply output voltage. In this scheme, the output is maintained by adjusting the on-time or duty cycle of the switched voltage regulator. The controller does not directly regulate the output voltage, but instead regulates an internal current-sensed error amplifier. This approach offers the superior dynamic performance seen with current mode control at lower cost.

The servo loop used to regulate the average output current is composed of a current sense amplifier, a transconductance amplifier, a voltage reference and two error amplifiers, one of which is called the ‘fast’ amplifier whose output directly modulates the on-time. The reference voltage of the fast amplifier is set by the servo loop and is determined by the current sense voltage, the voltage drop across the current sense resistor and the adjustment voltage. The output of the second (‘slow’) amplifier modulates the off-time, which sets the average converter output current.

The controller also integrates a range of protection features to ensure safe operation of the converter. These include soft start, internal output short-circuit protection and under-voltage lockout. A fixed output overload response is also provided for, and can be permanently programmed by an external resistor. All these features have been developed to ensure robust operation of the DC-DC converter.

Conclusion

In summary, the TPS53127RGER is a DC-DC switching controller designed to implement highly efficient power factor corrected buck power supplies. It features pulse skipping control, current mode operation, protection functions and a variety of configurability options. It is used in a wide range of applications, such as portable computing and telecommunications equipment. Its advanced features and protection design make it suitable for a variety of applications.