ISL6267HRZ

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The ISL6267HRZ is a special purpose, low quiescent current, pulse-width modulation (PWM) voltage regulator from Intersil Corporation. It is designed to provide reliable, long-term voltage regulation of off-the-shelf direct current (DC) to AC power conversion systems for applications such as consumer, industrial and medical equipment. In addition, the ISL6267HRZ has been optimized to provide efficient, low-noise voltage regulation in a variety of system architectures, including AC-DC and DC-DC conversion.

ISL6267HRZ Application Field

The ISL6267HRZ is a special purpose voltage regulator which is widely used in consumer, industrial, and medical applications. It is an ideal choice for high-voltage, high-frequency applications, such as synchronous rectified buck, flyback, and buck-boost power conversion. The ISL6267HRZ can also be used for low-voltage applications, such as battery-powered systems, or to regulate the output of a switching or linear regulator.

The ISL6267HRZ provides identical efficiency and voltage regulation performance across a wide range of load currents and input conditions, making it ideal for applications that require tight voltage regulation and minimal power ripple. Thes ISL6267HRZ can also be used in low standby-power applications, such as those that require an inactive state or low input current.

ISL6267HRZ Working Principle

The ISL6267HRZ is a pulse-width modulation (PWM) voltage regulator which utilizes a fixed frequency, feed-forward current mode control loop. The regulator has a separate voltage reference and error amplifier circuitry to generate the control signals that drive the PWM comparator. The power switches are then enabled and disabled in a specific sequence in order to regulate the output voltage.

The PWM comparator monitors the output voltage with the aid of the voltage reference and error amplifier circuitry. When the output voltage is above the desired set point, the error amplifier deactivates the PWM comparator, reducing the duty cycle and thus decreasing the output voltage. Conversely, when the output voltage is below the desired set point, the error amplifier activates the PWM comparator, increasing the duty cycle and thus increasing the output voltage.

The frequency of the PWM control loop is selectable with an external resistor and capacitor. A synchronous rectifier circuit is used to reduce power loss in the power switches and to improve overall efficiency. The current sensing circuit allows accurate over-current protection, allowing the ISL6267HRZ to be used in a wide range of systems and applications. In addition, the ISL6267HRZ has thermal protection circuitry to ensure reliable operation.

Conclusion

The ISL6267HRZ is a special purpose, low quiescent current, pulse-width modulation (PWM) voltage regulator from Intersil Corporation. It is designed to provide reliable, long-term voltage regulation of off-the-shelf direct current (DC) to AC power conversion systems for applications such as consumer, industrial and medical equipment. The ISL6267HRZ utilizes a fixed frequency, feed-forward current mode control loop with a separate voltage reference and error amplifier circuitry to generate the control signals that drive the PWM comparator. The PWM comparator monitors the output voltage with the aid of the voltage reference and error amplifier circuitry in order to regulate the output voltage. A synchronous rectifier circuit is used to reduce power loss in the power switches and to improve overall efficiency, while current sensing and thermal protection circuitry help ensure reliable operation.

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