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