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A8291

Allegro MicroSystems
Part Number A8291
Manufacturer Allegro MicroSystems
Description Single LNB Supply and Control Voltage Regulator
Published Mar 13, 2007
Detailed Description www.DataSheet4U.com A8291 Single LNB Supply and Control Voltage Regulator Features and Benefits ▪ 2-wire serial I2C™ -c...
Datasheet PDF File A8291 PDF File

A8291
A8291

Overview
www.
DataSheet4U.
com A8291 Single LNB Supply and Control Voltage Regulator Features and Benefits ▪ 2-wire serial I2C™ -compatible interface: control (write) and status (read) ▪ LNB voltages (16 programmable levels) compatible with all common standards ▪ Tracking switch-mode power converter for lowest dissipation ▪ Integrated converter switches and current sensing ▪ Provides up to 500 mA load current ▪ Static current limit circuit allows full current at startup and 13→18 V output transition; reliably starts wide load range ▪ Push-pull output stage minimizes 13→18 V and 18→13 V output transition times for highly capacitive loads ▪ Adjustable rise/fall time via external timing capacitor ▪ Built-in tone oscillator, factory-trimmed to 22 kHz facilitates DiSEqC™ tone encoding, even at no-load ▪ Four methods of 22 kHz tone generation, via I2C™ data bits and/or external pin ▪ Filter bypass MOSFET minimizes losses during tone transmit ▪ 22 kHz tone detector facilitates DiSEqC™ 2.
0 decoding ▪ Au...


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