A8290集成电路（IC）的特殊用途稳压器规格书PDF中文资料

A8290属于集成电路（IC）的特殊用途稳压器。由Allegro MicroSystems制造生产的A8290特殊用途稳压器该系列产品用于电源控制、某种形式的转换，适用于特定的复杂应用。因此，各种产品特性集差异较大，包括空燃比传感器接口、汽车交流发电机电压调节、DDR 端接、液体透镜控制、摩托车转向信号控制、热电 (peltier) 冷却器控制、压电触觉控制、阀门控制、小型发动机管理等。

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

▪ Output current limit of 900 mA typical, with 48 ms timer

▪ 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

▪ Diagnostics for output voltage level, input supply UVLO,

and DiSEqC™ tone output

▪ Auxiliary modulation input

▪ LNB overcurrent with timer

▪ Cable disconnect diagnostic