27 MHz radio station power amplifier. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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27 MHz radio station power amplifier. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio stations, transceivers

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Random news from the Archive

High-voltage ultra-bright LED drivers from IR 18.06.2007

Possible applications for these drivers are architectural and decorative lighting, color music, outdoor and indoor signaling. The 200V and 600V rated IRS254x series includes a hysteresis step-down regulator with a delay to control the average current to within 5% accuracy based on an accurate estimate of the difference between the current voltage and the maximum allowable voltage.

An external high-level bootstrap circuit controls the operation of the key flyback stage at frequencies up to 500 kHz. The low level driver is used when the synchronous rectifier is running. The IRS254x series ICs compensate for variations in LED parameters to implement control devices with improved accuracy and high internal stability.

The new ICs provide a micro-power start mode with less than 500 uA consumption and a 140 nsec switching pause. Other features of the new drivers are restart mode, latchless shutdown, PWM dimming capabilities. The ICs are available in compact 8-pin lead-free DIP and SOIC packages. Delivery of devices on a tape is possible.

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