TL5001ACP

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TL5001ACP Application Field and Working Principle

TL5001ACP is a family of programmable DC-DC Buck switcher controllers. It operates at high frequencies with operation up to 2 MHz for enhanced efficiency, fast transient performances, and lower component count. This allows for a wide application field and a smaller form factor compared to traditional low-frequency DC-DC switching solutions. With its separated power and control ground pins, TL5001ACP helps to reduce the noise and achieve performance paralleled with DDR memory application.

Application Field

The power range for the TL5001ACP is up to 30V. The main application is for mobile and consumer electronics and low power embedded systems. It is designed for power supply systems that require high efficiency, small size, wide integration and minimal external components. It has good voltage accuracy and requires very low ESR components due the switching capability of up to 2MHz, which can help to get up better thermal performance while minimizing size through the use of smaller passive components.

TL5001ACP is perfect for applications in portable devices such as cell phones, camera, navigation, portable gaming device and power bank, because of its low cost and small size. Moreover, it is compatible with many embedded systems for both industrial and home automation market.

Working Principle

The basic principle behind the TL5001ACP is its advanced high frequency PWM design. The controller takes an unregulated DC input voltage and generates a precise output voltage at the chosen set point. The adjustment to the output voltage is done by changing the voltage reference of the error amplifier. The reference voltage is compared with the output voltage, and then the Duty Cycle of the PWM generator is modulated.

The operation of the TL5001ACP is provided with an internal high-frequency oscillator and an internal PWM generator. The internal PWM generator takes the feedback signal from the output voltage and applies the compare between the reference voltage and the output voltage. When the output voltage reaches set point, the PWM generator will switch the MOSFET off and then the peak current mode control is applied. The peak current mode control is to regulate the output current at the highest frequency.

Other Features

The TL5001ACP has several additional features, such as the synchronization function, cycle-by-cycle current limit, short protection with latched protection and adjustable frequency. The synchronization function helps to synchronize the internal oscillator with an external clock, so it can work with other controllers in multiple power sources systems. The cycle-by-cycle current limit provides a protection function, to limit the current even if the peak current mode control can not reach the set point. The short protection will auto-recovery when the output pin of PWM is shorted, and the over temperature protection will stop the output by latched protection.

The TL5001ACP also includes output voltage adjust, ground fault monitor, and voltage rate monitor. With the adjustable frequency, it can change the switching frequency to avoid noise issues. The ground fault monitor feature can detect if there is a short circuit between the output pins of the PWM and ground. The voltage rate monitor can detect if the output voltage overshoots or undershoots compared with the set point.

Conclusion

The TL5001ACP is a DC-DC buck switcher controller designed for portable devices and embedded systems. Its advanced high frequency PWM design makes it the perfect choice for applications with high efficiency and small size requirements. Additionally, the TL5001ACP has additional features like synchronization, cycle-by-cycle current limit, short protection, adjustable frequency, ground fault monitor and voltage rate monitor, which provides a powerful solution. This 8-pin SOIC package device is pin compatible with its predecessors and other members in the family and contains all the features required to power many applications in the ever-growing mobile and embedded markets.

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