LM5141QRGETQ1

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LM5141QRGETQ1 is a switch mode DC-DC controller designed by Texas Instruments’. With a wide range of features and accuracy, LM5141QRGETQ1 is a reliable solution for the Linear Mode and PFM mode switch-mode applications. The product integrates free-time control, power save mode with adjustable PWM frequency, and low quiescent current for power savings.

Application Field

LM5141QRGETQ1 is a switch mode DC-DC controller designed for DC-DC converters with an adaptive peak current mode control. It is capable of Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) operation. The product is targeted at a wide range of applications, including a wide range of step voltage down, step voltage up, step current limit, transient load response, power factor control and power save mode applications. LM5141QRGETQ1 is suitable for the automotive electronics and testing, consumer electronics, medical, industrial, and telecom power supply markets.

Working Principle

LM5141QRGETQ1 is a synchronous rectified buck/boost controller with a wide range of input and output voltage options. It is based on a free-time control architecture which combines advantages of both the peak current mode and the valley current mode for better performance. Free-time control gives maximum efficiency over the full load range and features an adjustable PWM frequency for improved EMI emissions. The control scheme also provides a fast transient load response and excellent current limiting performance. The device features an adaptive peak current adjustment, which automatically determines the optimum peak current level for best possible efficiency.

The power save mode of the controller enables the switching frequency to be automatically adjusted for optimal efficiency. It also includes an analog voltage reference for minimum variation in output voltage over the full load range. The LM5141QRGETQ1 also integrates low-quiescent current circuitry to ensure low power consumption even in power save mode.

The control loop of the LM5141QRGETQ1 is realized by the internal comparator and current sense circuit. The external components are used to set an operating point which is maintained by the controller. The external reference voltage is used to adjust the operating point along with the external voltage reference. The output voltage and current can also be limited using the external series current sense resistor and the PWM comparator. The controller compares the voltage reference voltage with the voltage sense voltage to provide a variable duty cycle for the LM5141QRGETQ1 output.

Conclusion

LM5141QRGETQ1 from Texas Instruments is a high-efficiency switch-mode DC-DC controller for applications such as step voltage down, step voltage up, step current limit, and power save mode applications. The product features adaptive peak current control and features a free-time control architecture for improved transient load response and current limiting performance. The power save mode enables the switching frequency to be automatically adjusted for optimal efficiency while maintaining low quiescent current.

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