ISL6401CB-T

ISL6401CB-T Application Field and Working Principle

The ISL6401CB-T low component count, fast turn-on, high-density buck dc-to-dc switching controller is designed for high frequency applications. It is suitable for use in a wide range of products up to 1-kW such as DC-DC converters, low power computing applications, power management, point-of-load supplies, and PoE / PD control systems. The ISL6401CB-T, with its integrated gate drive, uses Pulse Width Modulation (PWM) to control the ON/OFF states of the power supply.

Features

• Low component count, fast (<1us) turn-on
• Flexible, high-density (1kW) buck dc-to-dc switching solution
• High input voltage up to 4V
• Integrated gate drive for improved transient response
• Improved efficiencies up to 95 percent
• User-programmable versatility

Application Fields

The ISL6401CB-T is well-suited for many applications, from the aforementioned low power computing applications up to 1-kW power supplies, such as high-density DC-DC converters, point-of-load supplies, AC/DC and DC/DC conversion, battery chargers, PoE/PD management systems, telecom/datacenter power supplies, motor drives, and various other applications.

Working Principle

The ISL6401CB-T is a switching controller that uses Pulse Width Modulation (PWM) to regulate the output voltage of the power supply. It uses MOSFETs as power switching elements and provides integrated gate drivers, allowing for fast and efficient operation. The level-shifted PWM controller output is used to turn the MOSFETs on and off, while an internal current-sense amplifier is used to precisely monitor the inductor current. The amplifier uses the signal from the current-sense resistor to regulate the switch-on time, allowing for precise output voltage control with minimal ripple.

The integrated high-speed gate drivers in the ISL6401CB-T provide fast turn-on times, which helps reduce current spike during switching transition and increase efficiency. The gate-on turn-on delay time is typically less than 1μs and gate-off turn-off delay time is typically less than 5μs, allowing for fast dynamics and stability. The gate driver also provides protection with its dead-time control feature, preventing the MOSFETs from short-circuiting during turn-on transition.

Conclusion

The ISL6401CB-T is an ideal solution for high-density and fast-turn-on switching applications, due to its low component count, fast (<1us) turn-on time and integrated gate driver. It provides high input voltage up to 4V and efficient switching operations up to 95%, allowing for improved power supply performance and efficiency. With its versatile user-programmable feature, the ISL6401CB-T is an excellent choice for many power management and conversion applications.