ZL8802ALAFT7A

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The ZL8802ALAFT7A is a DC/DC switch-mode controller capable of delivering up to 1.25A of continuous output current over a wide input voltage range of 3.5V to 5.5V. The device can be used for both voltage regulation and input current regulation, or for combining both functions. It also provides high efficiency, low noise, and good modulated performance.

Application Field

The ZL8802ALAFT7A is suitable for any type of DC/DC switching controller application. It is particularly useful when the required output needs to be held constant over an input voltage range. It is designed for applications such as battery chargers, power supplies, DC/DC converters, motor controllers, switching regulators, and more. It also can be used in low voltage, low power applications as well as high voltage, high power applications, such as in solar, automotive, industrial and communications applications.

Working Principle

The ZL8802ALAFT7A is a DC/DC switching controller which uses the Pulse Width Modulation (PWM) technique to switch and control the voltage and current of the output. In this method, a waveform with a fixed frequency is generated and the output voltage is adjusted by varying the duty cycle of this waveform. The duty cycle is determined by an external voltage divider between the output and the reference voltage, which sets the reference current. The drive circuit is then used to adjust the duty cycle, amplitude, or other parameters according to the voltage feedback and current feedback signals, respectively.

The DC/DC switching controller also uses feed-forward (FF) loop control on the output voltage, which helps increase the ripple of the output and reduce power losses. The controller also has built-in over-current protection, short-circuit protection, and over-temperature protection for safety. Additionally, it has built-in soft start control and light-load control, which helps to extend the lifetime of the device and to reduce power consumption.

Conclusion

The ZL8802ALAFT7A is a DC/DC switching controller capable of delivering up to 1.25A of continuous output current over a wide input voltage range of 3.5V to 5.5V. It is suitable for any type of DC/DC switching controller application and can be used for both voltage regulation and input current regulation. It uses the Pulse Width Modulation technique to switch and control the voltage and current of the output, coupled with feed-forward loop control on the output voltage for increased ripple and reduced power losses. It also has a number of built-in protective features, making it ideal for a variety of applications.

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