Linear公司的LTC4000-1是高壓高性能轉換器,能把許多外部補償的DC/DC電源轉換成全特性的電池充電器,并具有最大功率點控制.其最大功率點控制和太陽能板輸入兼容,輸入電壓3V-36V,可編程充電精度±1%,可編程浮電壓精度±0.25%,主要用在太陽能電池充電系統,高阻抗輸入源如燃料電池或風能的電池充電器,工業電池設備或手持軍用設備.本文介紹了LTC4000-1主要特性,框圖和多種應用電路圖.
The LTC®4000-1 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into full-featured battery chargers with maximum power point control. In contrast to the LTC4000, the LTC4000-1 has an input voltage regulation loop instead of the input current regulation loop.
Features of the LTC4000-1’s battery charger include:
accurate (±0.25%) programmable float voltage, selectable timer or current termination, temperature qualified charging using an NTC thermistor, automatic recharge, C/10 trickle charge for deeply discharged cells, bad battery detection and status indicator outputs. The battery charger also includes precision current sensing that allows lower sense voltages for high current applications.
The LTC4000-1 supports intelligent PowerPath control. An external PFET provides low loss reverse current protection.
Another external PFET provides low loss charging or discharging of the battery. This second PFET also facilitates an instant-on feature that provides immediate downstream system power even when connected to a heavily discharged or shorted battery.
The LTC4000-1 is available in a low profile 28-lead 4mmx5mm QFN and SSOP packages.
LTC4000-1主要特性:
Maximum Power Control: Solar Panel Input Compatible
Complete High Performance Battery Charger When Paired with a DC/DC Converter
Wide Input and Output Voltage Range: 3V to 60V
Input Ideal Diode for Low Loss Reverse Blocking and Load Sharing
Output Ideal Diode for Low Loss PowerPath™ and Load Sharing with the Battery
Programmable Charge Current: ±1% Accuracy
±0.25% Accurate Programmable Float Voltage
Programmable C/X or Timer Based Charge Termination
NTC Input for Temperature Qualified Charging
28-Lead 4mm x5mm QFN or SSOP Packages
LTC4000-1應用:
Solar Powered Battery Charger Systems
Battery Charger with High Impedance Input Source, e.g., Fuel Cell or Wind Turbine
Battery Equipped Industrial or Portable Military Equipments
圖1.LTC4000-1功能框圖
圖2.LTC4000-1采用太陽能板對三節LiFePO4電池充電電路:10.8V/10A
圖3.LTC4000-1采用太陽能板對六節鉛酸電池充電電路
圖4.LTC4000-1采用太陽能板,燃料電池或風能對五節鋰電池充電電路:21V/5A
圖5.LTC4000-1單個鋰電池充電電路:輸入18V-27V,輸出4.2V/2A,2.9小時定時器,充電涓流0.22A |
