ISL6553CBZA

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The ISL6553CBZA is a current-mode pulse width modulation controller that can be used in a variety of DC/DC voltage regulation and conversion applications. It integrates a high-performance current-mode controller, an adjustable 40V avalanche-rated N-channel MOSFET switch and full startup and shutdown control circuitry on a single monolithic device. It is available in either a 16-pin TSSOP package (ISL6553CBZA) or a 20-pin TSSOP package (ISL6553CZ).

Introduction to ISL6553CBZA

The ISL6553CBZA is a low cost, high efficiency, high-performance switching regulator controller and a key component of a synchronous step-down power supply. It is designed and optimized for Flyback, Buck and other secondary side driven applications and is available in both through-hole (ISL6553CBZA) and surface-mount (ISL6553CZ) packages. The controller is a current-mode PWM controller with built-in current sensing and load-line compensation ensuring a fast transient response and efficient operation. It provides adjustable output voltage and maximum power point (MPPT) tracking which supports efficient solar cell optimization. The controller is also suitable for USB power adapter applications and other applications requiring adjustable output voltage, current and thermal limiting features.

Application Field of ISL6553CBZA

The ISL6553CBZA is suitable for DC/DC conversion applications such as switching regulators, DC/DC converters, voltage regulators, power supplies and charger applications. It is ideal for automotive, industrial, medical, consumer, communications and computer applications. The output voltage can be adjustable from 1.5V to 12V when using an external feedback divider and from 3.3V to 24V when using an external feedback divider and bootstrap divider. This makes it suitable for a wide range of input voltage ranges including single and multiple cell Li-ion battery operations. The device is also suitable for USB power adapter application and other applications requiring adjustable output voltage, current and thermal limiting features.

Working Principle of ISL6553CBZA

The ISL6553CBZA works by regulating a pulse-width modulated output voltage to obtain a predetermined output voltage. It works on an average or DC current control principle, compared to traditional peak-current control. It consists of a controller, a switch and other external components that perform various tasks such as wave shaping, current sensing and feedback divider. The controller is responsible for controlling the pulses width of the switch operating frequency. It is set to the desired output voltage by the external voltage divider. The switch is a 40V avalanche rated N-channel MOSFET and is responsible for converting the incoming DC power to a pulse-width modulated output. The current sensing component is a resistor that senses the current flowing through the device and is used to set the peak current or voltage limit of the controller. The external components also provide the feedback signal to the controller for the output voltage sensing.

Conclusion

In conclusion, the ISL6553CBZA is a low cost, high efficiency, high-performance switching regulator controller optimised for Flyback, Buck and other secondary side driven applications. It is suitable for DC/DC conversion applications such as switching regulators, DC/DC converters, voltage regulators, power supplies and charger applications and is suitable for a wide range of input voltage ranges including single and multiple cell Li-ion battery operations. The controller works on an average or DC current control principle and its output voltage can be adjusted from 1.5V to 12V when using an external feedback divider and from 3.3V to 24V when using an external feedback divider and bootstrap divider.

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