ZHCSGB0B November 2017 – November 2020 LM5145
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Description (continued)
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Input Range (VIN)
- 8.3.2 Output Voltage Setpoint and Accuracy (FB)
- 8.3.3 High-Voltage Bias Supply Regulator (VCC)
- 8.3.4 Precision Enable (EN/UVLO)
- 8.3.5 Power Good Monitor (PGOOD)
- 8.3.6 Switching Frequency (RT, SYNCIN)
- 8.3.7 Configurable Soft Start (SS/TRK)
- 8.3.8 Voltage-Mode Control (COMP)
- 8.3.9 Gate Drivers (LO, HO)
- 8.3.10 Current Sensing and Overcurrent Protection (ILIM)
- 8.3.11 OCP Duty Cycle Limiter
- 8.4 Device Functional Modes
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1 Design 1 – 20-A High-Efficiency Synchronous Buck Regulator for Telecom Power Applications
- 9.2.2 Design 2 – High Density, 12-V, 10-A Rail With LDO Low-Noise Auxiliary Output for RF Power Applications
- 9.2.3 Design 3 – 150-W, Regulated 24-V Rail for Commercial Drone Applications With Output Voltage Tracking Feature
- 9.2.4 Design 4 – Powering a Multicore DSP From a 24-V or 48-V Rail
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
請(qǐng)參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGY|20
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購(gòu)信息
3 說明
LM5145 75V 同步降壓控制器旨在對(duì)高輸入電壓源或會(huì)發(fā)生高電壓瞬變的輸入電源軌進(jìn)行電壓調(diào)節(jié)，從而更大限度地減少對(duì)外部浪涌抑制元件的需求。40ns 的高側(cè)開關(guān)最短導(dǎo)通時(shí)間有助于獲得較大的降壓比，支持從 48V 標(biāo)稱輸入到低電壓軌的直接降壓轉(zhuǎn)換，從而降低系統(tǒng)的復(fù)雜性并減少解決方案成本。LM5145 在輸入電壓突降至 6V 時(shí)，仍能根據(jù)需要以接近 100% 的占空比繼續(xù)工作，因此是高性能工業(yè)控制、機(jī)器人、數(shù)據(jù)通信和射頻功率應(yīng)用的理想選擇。
強(qiáng)制 PWM (FPWM) 模式運(yùn)行可以消除開關(guān)頻率變化以更大程度地降低 EMI，而用戶可選的二極管仿真功能則可以降低輕負(fù)載條件下的電流消耗。高達(dá) 1MHz 的可調(diào)開關(guān)頻率可同步至外部時(shí)鐘源，以消除噪聲敏感應(yīng)用中的拍頻。
器件信息
| 器件型號(hào) | 封裝(1) | 封裝尺寸（標(biāo)稱值） |
|---|---|---|
| LM5145 | VQFN (20) | 4.50mm x 3.50mm |
(1) 要了解所有可用封裝，請(qǐng)參閱產(chǎn)品說明書末尾的可訂購(gòu)產(chǎn)品附錄。
典型應(yīng)用電路和效率性能，VOUT = 5V