STMicroelectronics LNBH26S双路LNBS电源和控制IC
STMicroelectronics LNBH26S 双路 LNBS 电源和控制 IC 是一款单片式稳压器和接口集成电路，采用 QFN-24 4x4mm 封装。该 LNBH26S 用于模拟和数字双卫星接收器/卫星电视和 Sat-PC 卡。该 IC 为碟式天线中的 LNB 降频转换器或多路交换器箱提供 13V/18V 电源和 22kHz 音频信号。该 LNBH26S 是一套用于双调谐器卫星接收器的完整解决方案，只需少数的元件、具有低功耗和 I²C 标准接口。
The IC provides the 13/18V power supply and 22kHz tone signaling to the LNB down-converter in the antenna dishes or to the multiswitch box. The LNBH26S is a complete solution for dual tuner satellite receivers with extremely low component count, low power dissipation and I²C standard interfacing.
特性
- Complete interface between LNB and I²C bus
- Built-in DC-DC converter for single 12V supply operation and high efficiency (typ. 93% @ 0.5A)
- Selectable output current limit by external resistor
- Compliant with main satellite receiver output voltage specification (15 programmable levels)
- Accurate built-in 22kHz tone generator suits widely accepted standards
- 22kHz tone waveform integrity guaranteed at no-load condition as well
- Low drop post regulator and high efficiency step-up PWM with integrated power NMOS allowing low power losses
- LPM function (low power mode) to reduce dissipation
- Overload and overtemperature internal protection with I²C diagnostic bits
- LNB short-circuit dynamic protection
- +/- 4kV ESD tolerant on output power pins
应用
- STB satellite receivers
- TV satellite receivers
- PC card satellite receivers
Evaluation Board
STMicroelectronics STEVAL-LNBH05评估板
采用基于LNBH26S器件的直流-直流转换器。
Block Diagram
发布日期: 2016-10-18
| 更新日期: 2022-03-11