A8293中文资料Single LNB Supply and Control Voltage Regulator数据手册Allegro规格书

描述 Description

Intended for analog and digital satellite receivers, this single low noise block converter regulator (LNBR) is a monolithic linear and switching voltage regulator, specifically designed to provide the power and the interface signals to an LNB down converter via coaxial cable. The A8293 requires few external components, with the boost switch and compensation circuitry integrated inside of the device. A high switching frequency is chosen to minimize the size of the passive filtering components, further assisting in cost reduction. The high levels of component integration ensure extremely low noise and ripple figures.

The A8293 has been designed for high efficiency, utilizing the Allegro advanced BCD process. The integrated boost switch has been optimized to minimize both switching and static losses. To further enhance efficiency, the voltage drop across the tracking regulator has been minimized.

For DiSEqC™ communications, several schemes are available for generating tone signals, all the way down to no-load, and using either the internal clock or an external time source.

A comprehensive set of fault registers are provided, which comply with all the common standards, including: overcurrent, thermal shutdown, undervoltage, and power not good.

The device uses a 2-wire bidirectional serial interface, compatible with the I²C™ standard, that operates up to 400 kHz.

The A8293 is supplied in a lead (Pb) free MLP/QFN package: ES, 20-contact, 4 mm × 4 mm, 0.75 nominal overall height.

This part is discontinued. Samples are no longer available. Date of status change: December 5, 2018.

Recommended Substitutions: Generation 4 and 5 devices. For existing customer transition, and for new customers or new applications, contact Allegro Sales.

特性 Features

• 2-wire serial I²C™-compatible interface: control (write) and status (read)
• LNB voltages (8 programmable levels) compatible with all common standards including domestic Japan models
• Tracking switch-mode power converter for lowest dissipation
• Integrated converter switches and current sensing
• Provides up to 700 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
• Auxiliary modulation input
• LNB overcurrent with timer
• Diagnostics for output voltage level, input supply UVLO

简介

A8293属于集成电路（IC）的特殊用途稳压器。由制造生产的A8293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。