STMicroelectronics L7987L 异步降压开关稳压器
STMicroelectronics L7987L 异步降压开关稳压器能够提供的电流高达 2A DC，输出电压范围为 0.8V 至近 VIN。 VBIAS 引脚具有 AM 嵌入式切换功能，最大限度地提高轻负载时的效率。 可调电流限制设计用于根据标称输出电流选择电感器 RMS 电流。 高开关频率能力使应用的尺寸变得紧凑。
The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise in low noise applications like sensors with A/D conversion.
特性
- 2A DC output current
- 4.5V to 61V operating input voltage
- RDS,ON = 300mΩ typ.
- Adjustable fSW (250kHz - 1.5MHz)
- Low IQ-SHD (11μA typ. from VIN)
- Low IQ (1mA typ. - VIN 24V - VOUT 3.3V)
- Output voltage adjustable from 0.8V to VIN
- Synchronization
- Adjustable soft-start time
- Adjustable current limitation
- Advanced bootstrap capacitor management for LDO operation
- VBIAS improves efficiency at light load
- PGOOD open collector output
- Output voltage sequencing
- Digital frequency foldback in short-circuit
- Peak current foldback in short-circuit
- Auto-recovery thermal shutdown
应用
- Designed for 24V bus
- Fail safe tolerant systems
- Programmable logic controllers (PLCs)
Block Diagram
Associated Boards
STMicroelectronics STEVAL-ETH001V1伺服驱动器评估板
设计用于满足面向多轴位置控制和连接的三相PMSM应用的需求。
STMicroelectronics STEVAL-ISA198V1 评估板
基于 L7987L 稳压器的降压开关电源，输入电压为 4.5-60V。
STMicroelectronics STEVAL-SILPLC01安全型PLC评估板
将CLT03-2Q3双数字输入和IPS160HF单数字输出结合在一起，组成PLC解决方案。
发布日期: 2017-01-24
| 更新日期: 2022-11-10