Texas Instruments LM4600x 降压转换器
德州仪器 LM4600x SIMPLE SWITCHER® 是易于使用的同步降压型直流-直流转换器,能以 3.5V 到 60V 范围的输入电压,驱动高达 2A 的负载电流。LM4600x 以非常小的尺寸提供优异的效率、输出精度和压差。采用了峰值电流模式控制,以实现对环路补偿和逐周期电流限制的简单控制。它还具有可编程开关频率、同步、电源正常标记、精密启用、内部软启动、可扩展软启动、跟踪等可选特性,为广泛应用提供了灵活、易于使用的平台。轻负载条件下的非连续传导和自动频率调制提高了轻负载效率。该系列仅需少量外部元件,而其引脚排列有助于简单、最优的 PCB 布局。保护特性包括热关断、VCC 欠压闭锁、逐周期电流限制、输出短路保护。特性
- 24µA or 27µA quiescent current in regulation
- High efficiency at light load (DCM and PFM)
- Meets EN55022/CISPR 22 EMI standards
- Integrated synchronous rectification
- 200kHz to 2.2MHz (500kHz default) adjustable frequency range
- Frequency synchronization to an external clock
- Stable with almost any combination of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
- Internal compensation
- Power-Good flag
- Soft-Start into a pre-biased load
- 4.1ms internal soft-start
- Extendable soft-start time by an external capacitor
- Output voltage tracking capability
- A precision enable to program system UVLO
- Output short circuit protection with hiccup mode
- Over-temperature thermal shutdown protection
应用
- Industrial power supplies
- Telecommunications systems
- Sub-AM band automotive
- Commercial vehicle power supplies
- General purpose wide VIN regulation
- High-efficiency Point-of-Load (PoL) regulation
视频
Simplified Schematic
发布日期: 2014-08-29
| 更新日期: 2025-03-05
