STMicroelectronics Reveals Monolithic Automotive Synchronous Buck Converters for Light-load, Low-noise, and Isolated Applications
STMicroelectronics Reveals Monolithic Automotive Synchronous Buck Converters for Light-load, Low-noise, and Isolated Applications
STMicroelectronics has introduced new automotive-qualified step-down synchronous DC/DC converters that save space and ease integration in applications including body electronics, audio systems, and inverter gate drivers.
意法半导体推出了符合汽车标准的新型降压同步DC/DC转换器,可节省空间并简化包括车身电子设备、音频系统和逆变器栅极驱动器在内的应用的集成。
The A6983 converters offer flexible design choices, comprising six non-isolated step-down converters in low-consumption and low-noise configurations and the A6983I isolated buck converter. With compensation circuitry on-chip, these highly integrated monolithic devices need only minimal external components including filtering, feedback, and a transformer with the A6983I.
The non-isolated A6983 converters can supply up to 3A load current and achieve 88% typical efficiency at full load. The low-consumption variants (A6983C) are optimized for light-load operation, with high efficiency and low output ripple, to minimize drain on the vehicle battery in applications that remain active when parked. The low-noise A6983N variants operate with constant switching frequency and minimize output ripple across the load range for optimum performance in applications such as audio-system power supplies. Both types offer a choice of 3.3V, 5.0V, and adjustable output voltage from 0.85V to VIN.
非隔离式 A6983 转换器可提供高达 3A 的负载电流,满载时可实现 88% 的典型效率。低功耗变体 (A6983C) 针对轻载操作进行了优化,效率高,输出纹波低,可最大限度地减少停放时保持活动状态的应用中的车辆电池消耗。低噪声 A6983N 变体以恒定的开关频率运行,并在负载范围内最大限度地减少输出纹波,从而在音频系统电源等应用中实现最佳性能。两种类型均提供 3.3V、5.0V 的选择,以及从 0.85V 到 VIN 的可调输出电压。
The A6983I is a 10W iso-buck converter with primary-side regulation that eliminates the need for an optocoupler. Ideal for use as an isolated gate driver for IGBTs or silicon-carbide (SiC) MOSFETs in traction inverters and on-board chargers (OBCs), this converter allows accurate adjustment of the primary output voltage. The transformer turns ratio determines the secondary voltage.
A6983I 是一款具有初级侧调节功能的 10W 等压降压转换器,无需光电耦合器。该转换器非常适合用作牵引逆变器和车载充电器 (OBC) 中 IGBT 或碳化硅 (SiC) MOSFET 的隔离栅极驱动器,可精确调整初级输出电压。变压器圈数比决定二次电压。
All isolated and non-isolated variants have a low quiescent operating current of 25μA and a power-saving shutdown mode that draws less than 2μA. The input-voltage range from 3.5V to 38V, and load-dump tolerance up to 40V, prevent disruption due to transients on the main supply bus. There is also output overvoltage protection, thermal protection, and internal soft start. In addition, optional spread-spectrum operation helps lower electromagnetic interference (EMI) for noise-sensitive applications, and a power-good pin that enables power sequencing. The A6983I and A6983 allow synchronization to an external clock.
所有隔离型和非隔离型号均具有 25μA 的低静态工作电流和消耗小于 2μA 的省电停机模式。输入电压范围为 3.5V 至 38V,负载突降容差高达 40V,可防止主电源总线上的瞬变造成的中断。还有输出过压保护、热保护和内部软启动。此外,可选的扩频操作有助于降低噪声敏感型应用的电磁干扰 (EMI),以及支持电源排序的电源良好引脚。A6983I 和 A6983 允许同步到外部时钟。
The converters are offered in a 3mm x 3mm QFN16 package. Pricing starts at $1.75 for the A6983 and $1.81 for the A6983I, for orders of 1000 pieces, and free samples of the A6983 and A6983I are available from the ST eStore. The STEVAL-A6983CV1 and STEVAL-A6983NV1 A6983 evaluation boards and STEVAL-L6983IV for the A6983I are available to kickstart development and accelerate project completion.
For more information, please visit www.st.com/A6983-A6983I
欲了解更多信息,请访问 www.st.com/a6983-a6983i