A8286SETTR-T

• Product introduction

设计用于模拟和数字卫星接收器，该双低噪音降频转换稳压器 (LNBR) 是单片线性/Switching regulators，专用于通过同轴电缆将功率和接口信号传给两个 LNB 降压转换器。A8286 需要很少的外部元件，同时具有集成到器件内的升压开关和补偿电路。选择一个较高的开关频率，以最小化被动过滤元件的尺寸，进一步降低成本。高级别的元件集成可确保极低的噪音和脉动图形。

A8286 设计用于通过利用 Allegro® 高级 BCD 流程，获取高效率。经优化后，集成的升压开关可最小化切换和静态损耗。要进一步提高效率，需最小化跟踪稳压器过程中的压降。

A8286 具有一个可完全支持两种 DiSEqC™ 通信的集成音调检测功能。可提供若干种模式，以使用内部或外部时钟源极，在整个过程中直至无载荷时，生成音调信号。

该器件可提供全面的故障寄存器组，符合所有的普通标准，其中包括：过流、过热关机、欠压、电缆断开、功率不合格和音调检测。

The device uses a 2-wire bidirectional serial interface, with I²C™ standard compatible and operating frequency up to 400 kHz.

A8286 采用无铅 28 引脚 MLP/QFN 封装，且引脚框采用 100% 雾锡电镀。

• 2-wire serial I²C-compatible™ interfaces: control (write) and status (read)
• LNB voltages (16 programmable levels) are compatible with all common standards
• Lowest dissipation tracking switch-mode power converter
• Integrated converter switching and current sensing
• 提供每通道高达 700 毫安及 1.0 安的总持续载荷电流
• Typical 900 mA output current limit with 48 ms timer
• Quiescent current limiting circuitry allows full current at start-up, 13→18 V output conversion, and a wide load range for reliable start-up
• The push-pull output stage minimizes 13→18 V and 18→13 V output conversion times for high capacitive loads
• The rise/fall time is adjustable by an external timing capacitor
• Built-in tone oscillator, factory calibrated to 22 kHz, helps DiSEqC™ tone encoding, even when there is no load
• Via I²The C™ data bit and/or external pin enable four 22 kHz tone generation methods
• The 22 kHz tone detector helps with DiSEqC™ 2.0 decoding
• Output voltage level, input supply UVLO, and DiSEqC™ tone output diagnostics
• Cable disconnect diagnostics
• Auxiliary modulation input
• With timer LNB overcurrent