IRPLLED1A International Rectifier, IRPLLED1A Datasheet - Page 2

• Manufacturer Part Number: IRPLLED1A
• Description: Power Management IC Development Tools Hi-Vlt DC-DC Buck Cnvr HBLED Cur Cntrl
• Manufacturer: International Rectifier
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of IRPLLED1A

• Product: Power Management Development Tools
• Tool Is For Evaluation Of: IRS25401PBF
• Output Voltage: 16 V to 24 V
• Output Current: 350 mA to 1.5 A
• Factory Pack Quantity: 1

EVALUATION BOARD - IRPLLED1A
1. Introduction
Development of LED technology over the last few years has produced high power devices with luminous efficacies
surpassing Fluorescent and HID light sources. These solid state light sources also posses the added advantages of
longer operating life span, up to 50000 hours as well greater robustness that other less efficient light sources.
For these reasons high power LEDs have now become a viable alternative for many general lighting applications.
High power LEDs are driven with constant regulated DC current, requiring a "ballast" or "converter" to provide the
required current from an AC or DC power source. The IRS25410/11 series Buck LED driver provides an accurately
controlled current and protects the LEDs against damage from overload, while providing the ability to dim the light
level. The IRS25401 and IRS25411 are drop in replacements for the IRS2540 and IRS2541, which are not
recommended for new designs. The high side level shifting circuitry in the IRS25401/11 has been improved to
prevent the possibility of the high side latching up under certain circumstances during dimming.
The IRPLLED1A evaluation board is a high voltage LED driver designed to operate from a DC input voltage of
50V to 170V and produce an output voltage of 16V-24V to supply a programmable load current of 350mA, 700mA,
1A, or 1.5A. It uses the IRS25401/11, a high voltage, high frequency Buck control IC for constant LED current
regulation. The IRS25401/11 controls the average load current by a continuous mode time-delayed hysteretic
method using an accurate on chip band gap voltage reference. The 8-pin, 200V/600V rated IRS25401/11 inherently
provides short-circuit protection with open-circuit protection incorporated by a simple external circuit and has
dimming capability.
The evaluation board documentation will briefly describe the functionality of IRS25401/11, discuss the selection of
the output stage, switching components and surrounding circuitry. This board was tested with a single HBLED panel
for the 350mA and 700mA settings, using two similar flood boards in parallel to provide test loads for the 1A and
1.5A settings.
Important Safety Information
The IRPLLED1A does not provide galvanic isolation of the LED drive output from the line input. Therefore if the
system is supplied directly from a non-isolated input, an electrical shock hazard exists at the LED outputs and these
should not be touched during operation. Although the output voltage is low this electrical shock hazard still exists.
RD-0608
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