Analog Devices / Maxim Integrated MAX15004電流模式PWM控制器
Maxim IC MAX15004A與MAX15004B高性能、電流模式PWM控制器在啟動後可以低至2.5V的輸入電壓工作,並專門針對真空螢光顯示器(VFD)提供輸出過電壓保護功能。實施固定頻率隔離型/非隔離型電源所必需的一切建置組塊,全都已整合到Maxim IC MAX15004 PWM控制器之中。透過採用MAX15004為核心,可以輕易地設計出通用升壓、反馳式、順向式和SEPIC轉換器。此控制器使用電流模式控制結構,具有優秀的線路瞬變反應與逐週期電流限制,並能簡化頻率補償流程。加上可編程的斜坡補償功能,使設計工作變得更為簡易。此控制器擁有快速的60ns電流限制反應時間,以及低至300mV的電流限制閥值,因而適用於高效率高頻DC-DC轉換器。此裝置包含內部誤差放大器和1%精確度基準,尤其適合用於初級側穩壓單端反馳式轉換器,或者非隔離型轉換器。這些Maxim IC PWM控制器適合各種應用,包括汽車、VFD電源、隔離反馳式、順向式、非隔離SEPIC及升壓轉換器。特點
- Wide Supply Voltage Range Meets Automotive Power-Supply Operating Requirement Including "Cold Crank" Conditions
- 4.5V to 40V Operating Input Voltage Range (Can Operate at Lower Voltage After Startup if Input is Bootstrapped to a Boosted Output)
- Control Architecture Offers Excellent Performance While Simplifying the Design
- Current-Mode Control
- 300mV, 5% Accurate Current-Limit Threshold Voltage
- Programmable Slope Compensation
- 50% (MAX15004) or Adjustable (MAX15005) Maximum Duty Cycle
- Accurate, Adjustable Switching Frequency and Synchronization Avoids Interference with Sensitive Radio Bands
- Switching Frequency Adjustable from 15kHz to 500kHz (1MHz for the MAX15005A/B)
- RC Programmable 4% Accurate Switching Frequency
- External Frequency Synchronization
- Built-In Protection Capability for Improved System Reliability
- Cycle-by-Cycle and Hiccup Current-Limit Protection
- Overvoltage and Thermal-Shutdown Protection
- -40°C to +125°C Automotive Temperature Range
- AEC-Q100 Qualified
應用
- Automotive
- Isolated Flyback, Forward, Nonisolated SEPIC, Boost Converters
- Vacuum Fluorescent Display (VFD) Power Supply
Functional Diagram
發佈日期: 2011-02-14
| 更新日期: 2023-04-21
