IRPLLED1 International Rectifier, IRPLLED1 Datasheet - Page 22

• 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

until the end of the current HO cycle as shown in the waveform diagram below. The reason for this is to avoid the
possibility off ENN transitioning from low to high at the exact time that HO transitions from low to high, which may
trigger the HO output to latch up under a low VBS supply condition. This is caused by propagation delays that exist
inside the IC. RSYNC and DSYNC are not necessary in non-dimming applications. Synchronization as described will
not affect the operation or dimming functionality of the circuit. It will serve only to protect the circuit against a
possible fault condition, without any detrimental effect to operation. The revised IRS25401 and IRS25411 contain
internal circuitry to protect against possible latch up conditions and do not require RSYNC and DSYNC.
Fig. 28a: Dimming Synchronization Waveforms.
9. Open circuit protection
Fig. 29 IRPLLED1 Improved Open Circuit Protection Scheme
RD-0608
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