ISL6557ACB

The ISL6557ACB is a pulse-width-modulated DC/DC converter from Intersil Corporation. It is a low-voltage, versatile and efficient regulator which is ideal for many applications including notebook PCs and embedded systems such as PCs, servers, etc. It is the industry’s highest-performance DC/DC controller, with a single-channel (up to 2.2V output) and dual-channel (up to 5V output) operating ranges. It also offers a wide range of output current ratings, up to 10A.

The ISL6557ACB works on a simple principle. It turns off when the output voltage is below the preset value and turns on when the output voltage is above the preset value. The ISL6557ACB bridges the gap between PWM and linear regulators by using pulse width modulation (PWM) to control the output voltage. The PWM technology with careful selection of the converter components minimizes the power dissipation and achieves the highest efficiency and power density in the industry. In addition, the pulse modulation technology provides excellent transient response with low output ripple, making it ideal for precision voltage regulation in power systems.

The main application fields of the ISL6557ACB are networking, broadcast/video, digital imaging, embedded/industrial, and automotive. Its use in all these applications have common benefits, such as improved system efficiency due to its higher power density, cost savings due to its high utilization of the power supply, and superior transient response due to the use of PWM to control the output voltage.

In a typical ISL6557ACB application, a control loop is set up to adjust the width of the pulse based on the output voltage of the DC/DC converter. A voltage reference establishes the maximum point of the output voltage. The signal is monitored via voltage or temperature sensing circuitry or shunt resistor. The signal is passed through a signal-conditioning circuit and the output is compared to the voltage reference via an error amplifier. Any deviation from the correct value results in a pulse width change. This feedback loop is what enables the ISL6557ACB to regulate the output voltage precisely with high efficiency.

In summary, the ISL6557ACB is a low-voltage, efficient DC/DC controller with an excellent transient response. It is ideal for applications such as networking, broadcast/video, digital imaging, embedded/industrial, and automotive that require precise voltage regulation with maximum efficiency and power density. The ISL6557ACB achieves this by using pulse width modulation (PWM) to control the output voltage and setting up a control loop to adjust the pulse width based on the output voltage of the DC/DC converter.