Power Electronics

Buck Converter Supports LED Color Mixing

International Rectifier has introduced a high-voltage, high-frequency buck regulator control IC for ac-dc offline, non-isolated applications requiring multiple light-emitting diode (LED) circuits or requiring dc-dc color-mixing capabilities.

Rated at 200 V or 600 V, the IRS254x series incorporates a continuous mode, time-delayed hysteretic buck regulator to control the average load current within a tolerance of 5%, using an accurate on-chip band gap voltage reference. An external high-side bootstrap circuit drives the buck switching element at high frequencies up to 500 kHz. A low-side driver is also provided for synchronous rectifier designs.

The ICs deliver a micro-power startup of less than 500 µA for extremely low losses at turn-on and a deadtime of 140 ns for continuous current regulation. Other features include auto restart, non-latched shutdown and PWM dimmable capability, incorporated into a compact 8-pin DIP or 8-pin SOIC package.

These ICs use a high-voltage IC process that incorporates high-voltage level-shifting and termination technology to deliver superior electrical over-stress protection and higher field reliability. Parameters are shown in the table.

Part Number

Package

Voltage
(Volts)

load current regulation

Micro-power
Startup (µA)

Deadtime
(ns)

Frequency
(kHz)

IRS2540xPbF

DIP8, S08

200

+/- 5%

<500

140

<500

IRS2541xPbF

DIP8, S08

600

+/-5%

<500

140

<500

All in 10,000-unit quantities, pricing begins at $0.81 each for the IRS2540PbF and IRS2540SPbF and $0.83 for the IRS2540STRPbF. Pricing for the IRS2541PbF and IRS2541SPbF begins at $0.89 and $0.91 for the IRS2541STRPbF.

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