Description
The IRS254(01,11) are high voltage, high frequency buck control ICs for constant LED current regulation. They incorporate a continuous mode time-delayed hysteretic buck regulator to directly control the average load current, using an accurate on-chip bandgap voltage reference. These parts directly replace the IRS2540 and IRS2541 with improved latch up immunity.

Features
• 200 V (IRS25401) and 600 V (IRS25411) half bridge driver
• Micropower startup (<500 μA)
• ±2% voltage reference
• 140 ns deadtime
• 15.6 V zener clamp on VCC
• Frequency up to 500 kHz
• Auto restart, non-latched shutdown
• PWM dimmable
• Small 8-Lead DIP/8-Lead SOIC packages

Typical Applications
    LED drivers for lamp replacement
    LED driver back end current regulator