IRPLLED1 International Rectifier, IRPLLED1 Datasheet - Page 30

• 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

Revision History
Rev/Date
Rev 2.
Aug 1, 2008
Rev 3.
Oct
27,2008
Rev 4.
April 15,
2009
Rev 5.
May 28,
2010
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Change Description
Updated Figure 16 to provide exact schematic of the demo
board including sync modification.
Added Figure 4a to show LED current jumper settings.
Correction made to duty cycle calculation in section 8.
Added Figure 28a to show synchronization waveforms for
PWM dimming with preceding explanatory text.
New PCB layout added in section 12 to include sync
modification.
Modified table of contents.
Section (1) updated.
Section (2) updated.
Section (3) updated.
Section (4) updated.
Section (5) updated.
Section (6) updated.
Section (8) updated.
Section (9) updated.
Updated Fig 22. R7 added to improve PWM dimming signal
generator circuit to reduce noise sensitivity and increase
stability. R7 also added to signal generator BOM.
Section 8 "Dimming Mode" now recommends a PWM
frequency of 1kHz for dimming.
Added additional comments in "Layout Considerations"
item (5)
Now updated for Rev D of the IRPLLED1 demo board.
Introduction – added safety warning.
Minor updates to sections (1) through (8)
Modified Fig 1 to remove old over voltage protection
circuit.
Replaced Fig 16 and Fig 29
Section 9 updated for new over voltage protection circuit.
Updated BOM
Updated PCB layout plots
Added notes concerning the die revision parts IRS25401
and IRS25411. Enhancements are explained in section 8.
RD-0608
Data and specifications subject to change without notice.
05/28/2010
30