LMR10520YSDE/NOPB

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Introduction

The LMR10520YSDE/NOPB is a DC to DC switching regulator designed by Texas Instruments in the PMIC (Power Management ICs) category of Voltage Regulators.

The LMR10520YSDE/NOPB switching regulator is an integrated solution using pulse-width modulation (PWM) to reduce system complexity and cost, and provide higher efficiency than linear regulators.

Application Field

The LMR10520YSDE/NOPB voltage regulator is designed for applications such as power supplies, battery management systems, RGB LED drivers, DC motors, and home appliances.

Performance and Parameters

The LMR10520YSDE/NOPB switching regulator can deliver up to 1.0A current output while supporting a wide input voltage range of 4.5V -16V. It also provides a wide range of output voltage options with adjustable output range of 0.8V -15V. The temperature operating range of this device is -40°C to 125°C.

The LMR10520YSDE/NOPB switching regulator features low quiescent current, high accuracy, and high efficiency. It also features a built-in Under-Voltage Lockout (UVLO) protection to ensure the voltage does not dip below the specified range.

Working Principle

The working principle of the LMR10520YSDE/NOPB voltage regulator is based on PWM (Pulse Width Modulation) technology. This circuit operates in constant frequency PWM control mode to provide high switching frequency and regulate the output voltage. The switching frequency can be set to 180 kHz and allows synchronization with an external clock. The PWM current-mode control eliminates the need of an error amplifier, resulting in minimal power dissipation.

The LMR10520YSDE/NOPB voltage regulator consists of an on-chip power switch, an internal comparator, and an internal oscillator. It uses an external signal to control the conduction period of the power switch. At the start of the conduction period, the internal wire from the current source and the inductor current cause the P-channel MOSFET to turn on. Then, the P-channel MOSFET will remain on until the voltage of the inductor current is higher than the feedback voltage. At that moment, the internal oscillator sets the P-channel MOSFET to turn off. This current discontinuity causes the instantaneous voltage to drop, producing the output voltage.

The output voltage is monitored by the voltage comparison circuit and can be adjusted by adjusting the external reference voltage. Moreover, the maximum duty cycle of this device can be set through an external pin, providing an adjustable switching frequency range.

Conclusion

Overall, the LMR10520YSDE/NOPB voltage regulator from Texas Instruments provides superior performance in terms of efficiency, accuracy, temperature operating range, and current output. It can be used in a wide range of applications such as power supplies, battery management systems, LED drivers, DC motors, and home appliances.

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