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ISL6558CRZ-T Application Field and Working Principle

The ISL6558CRZ-T is a DC-DC buck controller specially designed for off-line applications. It offers high performance, high integration and low power loss in a small TSSOP-16 package. This device provides a complete continuous conduction mode (CCM) PFC and DC-DC buck controller with a high voltage constant off-time control scheme.

The ISL6558CRZ-T is specifically designed for applications that require high efficiency over a wide range of loading conditions and low ripple and noise when compared to other low-cost solutions. This device also provides excellent transient response, superior loop stability, and fast over-voltage protection (OVP). It also features wide operating temperature range, low EMI, and short start up time.

Features of ISL6558CRZ-T

• Input voltage range of 8V to 700V
• CCM operation with fast current loop
• High efficiency and low power loss
• Excellent transient response
• Fast Over-Voltage Protection (OVP)
• Wide operating temperature range
• Low EMI

Application Fields

The ISL6558CRZ-T can be used in a wide variety of applications, including consumer and industrial equipment, such as AC/DC adapters, standby power supplies, battery operated systems and consumer electronic products. It is also suitable for Automotive applications such as USB charging ports, LCD displays and automotive audio systems.

Working Principle

The ISL6558CRZ-T is a DC/DC converters with constant off-time control. This type of control has proven itself to be superior to other control strategies, namely, the current mode control and the voltage mode control. The ISL6558CRZ-T adopts a constant off-time control where the inductor current is monitored and the switching cycle is modified accordingly. This allows the converter to remain in continuous conduction operation with a fast current loop, thereby obtaining the highest efficiency.

The ISL6558CRZ-T incorporates many features to ensure minimum power loss, system reliability and high efficiency. These features include advanced over-voltage and over-current protection, an accurate soft-start, an under-voltage lockout, an internal reference and a frequency jittering scheme.

The ISL6558CRZ is a highly reliable and efficient DC/DC controller designed for off-line and automotive applications. It offers low power loss and high efficiency over a wide range of loading conditions, and provides excellent transient response, superior loop stability, and fast over-voltage protection (OVP).

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