ZL6105ALAFTKR5553

PMIC - Voltage Regulators - DC DC Switching Controllers

The ZL6105ALAFTKR5553 is a highly integrated integrated circuit (IC) specifically designed for DC/DC switching controllers. This IC is ideal for use in power supplies, such as those used in industrial equipment, communication equipment, and consumer electronics.

Main Features

• On-chip programmable oscillator up to 300 kHz
• Functional safety of up to 100V working voltage
• On-chip current limit circuit
• Power Transistor Driving Circuit
• Internal soft start and overvoltage protection

Applications

• Industrial applications
• Communication equipment
• Computer-related equipment
• Computer peripherals
• Consumer electronics

Working Principle

The ZL6105ALAFTKR5553 is a DC/DC switching controller which regulates the output of a step-down DC/DC converter. This is done by using a PWM logic to control the switch state of the power transistor driving circuit. It works in two stages, firstly the internal oscillator generates a fixed frequency waveform and then synchronizes the proper switch control signal according to the feedback of the output voltage. When the output voltage needing input voltage exceeds the feedback voltage, the charge waveform of the boost capacitor is enabled, releasing the closed switch and allowing the current to enter the secondary coil. When the output voltage reaches the required level, the transistor switch is closed again and the energy accumulated in the secondary coil is released, sending the current out.

This method is called switching regulation, and the ZL6105ALAFTKR5553 views the output voltage, uses an accurate voltage reference, and then compares it to the feedback voltage. This voltage comparison determines the duty cycle of the control signal of the power transistor, which controls the input current of the secondary coil and the output voltage.

The main feature of the ZL6105ALAFTKR5553 is the high accuracy programmable frequency (up to 300KHz). This high working frequency reduces the size of the inductor and the capacitor, which are used to filter the ripple caused by the switching control, so the space and cost of the power system are also reduced.

In addition, on-chip current limit circuit and soft start function ensure a smooth and robust start-up and stable operations.

Conclusion

The ZL6105ALAFTKR5553 is an advanced DC/DC switching controller with an adjustable frequency up to 300KHz, which allows it to be used in a wide range of industrial, communication, computer-related, and consumer electronics applications. This highly integrated IC incorporates a power transistor driving circuit, voltage comparison, current limit circuit, and soft start function, making it an ideal choice for power systems in a variety of applications.