Description

The IRS254(0,1) 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.

The application is inherently protected against short circuit conditions, with the ability to easily add open circuit protection. An external high-side bootstrap circuit drives the buck switching element at high frequencies. A low-side driver is also provided for synchronous rectifier designs. All functions are realized within a simple 8 pin DIP or SOIC package.

Features

• 200 V (IRS2540) and 600 V (IRS2541) 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