IR21593

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The IR21593 is a high-precision, efficient, low-dropout, dual-phase synchronous PWM controller designed for LED lighting and ballast applications. It brings the latest technology in digital power management to those applications and is optimized for two-phase designs. With the perfect combination of high power density, low bill-of-material cost, and superior system performance, the IR21593 provides an optimal solution for most modern lighting applications.

Applications

The IR21593 is uniquely suited for LED applications since it includes adjustable power control and dimming capability. It is ideal for applications such as architectural lighting, high-bay lighting, outdoor lighting, roadway lighting and many others. The small footprint and high efficiency of the IR21593 reduce system cost, increase system reliability and improve system performance. In ballast application, the IR21593 provides a continuous output current and ultra low standby power to compatible fluorescent and HID fixtures.

Working Principle

The IR21593 provides two-phase synchronized dimming for LED or ballast lighting applications via PWM or DALI/DMX protocols. At the heart of the IR21593 is a dual-phase synchronous buck controller which feature a critical-conduction-mode (CRM) control. The CRM topology utilizes a single visible loop from input to output. A visible average voltage control loop monitors the feedback voltage of each phase and provides an accurate output voltage. The high-precision current sense resistors minimize the dynamic and static output voltage errors. In addition, the IR21593 provides high current than conventional buck solutions, up to 120 Amps.

The IR21593 also features PWM dimming, which is used to achieve constant light output. The PWM dimming is implemented by modulating the LED current via the adjustable output current limit control. The current limit value is set using an external potentiometer, or remote control inputs. The IR21593 can also be programmed to provide dimming ranges, enable power-saving features, or synchronize multiple systems for configurable light patterns.

Conclusion

The IR21593 is a highly configurable and accurate, dual-phase synchronous PWM controller that meets the rigorous demands of LED and ballast design. With its small form factor, high power density, low bill-of-material cost and superior system performance, the IR21593 offers an ideal solution for modern lighting applications.

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