Designed for use with analog and digital satellite receivers, this single-channel low-noise step-down conversion regulator (LNBR) is a monolithic linear/switching regulator designed to transmit power and interface signals to an LNB buck converter over coaxial cable. The A8305 has an integrated boost switch and compensation circuitry, so it requires very few external components. Choose a higher switching frequency to minimize the size of the passive filter element and further reduce costs. The high level of component integration ensures extremely low noise and pulsating graphics.
The A8305 is designed to leverage Allegro's® advanced BCD process for high efficiency. Optimized for integrated boost switches to minimize switching and static losses. To further improve efficiency, voltage drops in the process of tracking regulators have been eliminated to a minimum.
For DiSEqC™ ™ communication, a tone control pin is provided for strobe control of the internally generated 22 kHz tone switch.
The device provides a comprehensive set of fault registers that meet all common criteria, including: overcurrent, overtemperature shutdown, undervoltage, and poor power supply.
Additionally, the design approach and construction ensure the highest level of stability against transients and component failures. The device uses a 2-wire bidirectional serial interface, is compatible with the I2C™ standard, and operates at up to 400 kHz.
The A8305 is available in a lead-free (Pb) package.
-
集成升压 MOSFET、电流检测和补偿
-
与超薄陶瓷升压电容器运行稳定
-
新型 15.67 V 输出设置，可适应日本市场的设计
-
250 至 950 mA 的可调 LNB 输出电流限制
-
可满足广泛的应用要求
-
最紧凑的部件，可迎合各种应用
-
用于启动、重新配置以及连续输出（最大值取决于 PCB 热设计）
-
升压峰值限流水平与 LNB 限流设置成比例
-
8 级可编程 LNB 输出电压 (DAC)
-
带关机计时器的 LNB 过流限制器
-
在静态 LNB 电流限制范围内能够可靠地启动各种载荷
-
跟踪升压转换器，减少功耗
-
可由外部电容配置的 LNB 瞬变时间
-
推拉 LNB 输出级保持 →18 V 和
-
18→13 V 瞬变时间，即使在具有高容性载荷的情况下也是如此。
-
内置 22 kHz 音调振荡器，有助于 DiSEqC™ 音调编码，甚至在无载荷时亦可实现
-
无需额外的外部元件即可产生音调
-
诊断功能：PNG
-
广泛的保护功能：UVLO、OCP、TSD、CPOK
-
2 线 I2C 兼容接口