IRPLLED1 International Rectifier, IRPLLED1 Datasheet - Page 2

• Manufacturer Part Number: IRPLLED1
• Description: BOARD EVALUATION FOR IRS2540PBF
• Manufacturer: International Rectifier

Specifications of IRPLLED1

• Current - Output / Channel: 1.5A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 24V
• Features: Dimmable
• Voltage - Input: 50 ~ 170V
• Utilized Ic / Part: IRS2540PBF
• Core Chip: IRS2540, IRS2541, IRS25401
• Topology: Buck (Step Down)
• No. Of Outputs: 1
• Output Current: 1.5A
• Output Voltage: 500mV
• Dimming Control Type: PWM
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Contains lead / RoHS compliant by exemption

EVALUATION BOARD - IRPLLED1
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 IRS2540/1/01/11 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 IRS2540/1/01/11 will be replaced by the fully compatible revised IRS25401/11.
The IRPLLED1evaluation 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 IRS2540/1/01/11 or revised version IRS25401/11, a high voltage, high frequency Buck control
IC for constant LED current regulation. The IRS2540/1/01/11 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 IRS2540/1/01/11 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 IRS2540/1/01/11, 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 IRPLLED1 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.
It is recommended that for laboratory evaluation that the IRPLLED1 board be used with an isolated DC input
supply. The IRS2540/1/01/11 series Buck topology is suitable only for final applications where isolation is either not
necessary or provided elsewhere in the system.
RD-0608
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