IRPLLED1 International Rectifier, IRPLLED1 Datasheet - Page 29

• 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
www.irf.com
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: [phone]
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 preceeding 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) "Open circuit protection" has been re-written
with important updates. Later sections have been re-
numbered.
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)
RD-0608
Data and specifications subject to change without notice.
10/27/2008
29