ISL6558IRZ-TKR5240

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ISL6558IRZ-TKR5240 Application Field and Working Principle

The ISL6558IRZ-TKR5240 is a highly integrated, dual-channel power-supply controller from Intersil Corporation. It was designed for off-line, zero current-mode, and open-loop or closed-loop current-mode flyback power systems. Typical applications for ISL6558IRZ-TKR5240 controller family include low power adapters and enclosed power supplies, such as multi-output battery chargers, USB and wireless device chargers, and small appliances.

Bucket Architecture

This device features a unique bucket architecture that combines the primary PWM controller and high speed gate driver under one integrated package, allowing the external power MOSFETs to be driven with up to 100% duty cycle, while providing the most compact solution. It also features primary feedback, aux output voltage tracking, adjustable operating frequency and high side gate drivers. The ISL6558IRZ-TKR5240 comes in a miniature 7 mm × 5 mm DFN package, eliminating the need for a separate controller chip, making it ideal for space constrained applications.

Current Sensing

The ISL6558IRZ-TKR5240 provides for circuit optimization and is designed for both open-loop and closed-loop current-mode operations. The closed-loop current sense architecture adjusts the PWM frequency to maintain a constant current from the source to the power stage, thus providing optimum efficiency, power density, and overall system performance. The open-loop operation allows the user to set the load current limit and select the PWM frequency. The ISL6558IRZ-TKR5240 integrates a high-side current sense resistor which senses the load current and provides current-mode enhanced conversion efficiency.

Overvoltage Protection

Overvoltage protection can be set easily using an external resistor and the primary feedback input. The overvoltage protection feature provides fast and precise control of the output voltage in both open-loop and closed-loop topologies. The device also provides built-in over-temperature protection, as well as undervoltage protection to ensure reliability and long life of the power system.

High Side Gate Drivers

The ISL6558IRZ-TKR5240 integrates a high speed gate driver that is capable of driving two external power MOSFETs with up to 100% duty cycle. The internal gate driver eliminates the need for an external driver, thus freeing up board space and eliminating the need to design an isolated gate driver. The device includes an adjustable operating frequency which can be used to optimize the system performance.

Fault Protection

Intersil’s ISL6558IRZ-TKR5240 device also provides comprehensive protection against over-current, over-temperature, short circuit, and undervoltage conditions by terminating the switching cycle or disabling the device until the fault condition is cleared. The device also provides fault status LED indication, as well as a fault/enable pin for external fault management.

Conclusion

The ISL6558IRZ-TKR5240 controller family from Intersil is an integrated dual channel power-supply controller that features a unique bucket architecture, current sensing, over-voltage protection, high-side gate drivers, and fault protection making it the ideal choice for off-line and zero current-mode flyback power systems. It is the perfect solution for low power adapters and enclosed power supplies, such as multi-output battery chargers, USB and wireless device chargers, and small appliances.

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