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
As the industry becomes more power conscious to compensate for increasing energy costs and to meet governmental
regulations, new innovative ways of conserving energy are being developed. For the lighting industry one of these
outlets has been LEDs. Due to their longevity, robust design, low maintenance and high efficiency, they have
proven a viable alternative to less efficient light sources. With their long term projected falling cost and further
increased efficiency, the industry has eagerly embraced LEDs, putting them largely in demand. LEDs require
drivers that have specific features such as constant current control over the temperature and manufacturing
variations of LEDs, dimming and appropriate fault protections. The IRS2540/1 is specifically designed to address
these requirements
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, a high voltage, high frequency Buck control IC for constant LED current regulation.
The IRS2540/1 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 inherently provides short-
circuit protection with open-circuit protection incorporated by a simple external circuit and has dimming capability.
The IRS2540/1 allows scalable designs to accommodate series and parallel configurations of LEDs, for today’s
production LEDs as well as new generation higher current LEDs, and provides high current control accuracy over
input and output voltage.
The evaluation board documentation will briefly describe the functionality of IRS2540/1, discuss the selection of the
output stage, switching components and surrounding circuitry. This board was tested with a single Lumileds™ flood
board for the 350mA and 700mA settings using two Lumileds flood boards in parallel to provide test loads for the
1A and 1.5A settings. Lumileds flood boards are available through Future Electronics and have a maximum
nominal current rating of 700mA with a breakdown voltage between 16 and 24V. The IRPLLED1 evaluation board
can operate from a 120V AC rectified line with the addition of a bridge rectifier and smoothing capacitor at the front
end. It is non-isolated and therefore although the output voltage is low an electric shock hazard still exists!
RD-0608
2
www.irf.com