LNBH25L中文资料LNB供电和控制IC，带升压和I²C接口数据手册ST规格书

描述 Description

Intended for analog and digital satellite receivers/Sat-TV and Sat-PC cards, the LNBH25L is a monolithic voltage regulator and interface IC, assembled in QFN24 (4x4) specifically designed to provide the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the antenna dish or to the multi-switch box. In this application field, it offers a complete solution with extremely low component count and low power dissipation together with a simple design and I²C standard interfacing.

特性 Features

• Complete interface between LNB and I²C bus
• Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93% @ 0.5 A)
• Selectable output current limit by external resistor
• Compliant with main satellite receiver output voltage specifications
• Accurate built-in 22 kHz tone generator suits widely accepted standards
• 22 kHz tone waveform integrity guaranteed also at no load condition
• Low-drop post regulator and high efficiency step-up PWM with integrated power N-MOS allowing low power losses
• Overload and overtemperature internal protection with I²C diagnostic bits
• LNB short-circuit dynamic protection
• +/- 4 kV ESD tolerant on output power pins

简介

LNBH25L属于集成电路（IC）的特殊用途稳压器。由ST制造生产的LNBH25L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。