ltm4620主要特性:
complete standalone dual output power supply
dual 13a or single 26a output
wide input voltage range: 4.5v to 16v
output voltage range: 0.6v to 2.5v
±1.5% maximum total dc output error
multiphase current sharing with multiple ltm4620s up to 100a
differential remote sense amplifier
current mode control/fast transient response
adjustable switching frequency
overcurrent foldback protection
frequency synchronization
internal temperature sensing diode output
output overvoltage protection
low profile (15mm × 15mm × 4.41mm) lga package
tm4620应用:
telecom and networking equipment
storage and atca cards
industrial equipment
图.ltm4620简化框图
图.输出跟踪的ltm4620应用电路
图.ltm4620 5v-16v输入,1.5v和1.2v 13a输出电路图
图.ltm4620带温度监视的2相1.5v 26a应用电路
图.ltm4620 1.2v和1v 输出跟踪电路
图.ltm4620 4相1.2v 50a电路图
演示板1780a-c
demonstration circuit 1780a-c features poly phase design using the ltmr4620ev, the high efficiency, high density, dual 13a, switch mode step-down power module regulator.
the input voltage is from 4.5v to 16v. the output voltage is jumper selectable from 1.0v to 2.5v. dc1780a-c can deliver nominal 100a output current with 4× ltm4620s in parallel. as explained in the data sheet, output current derating is necessary for certain vin, vout, and thermal conditions. the ltm4620 on dc1780a-c always operates in continuous conduction mode. the switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. the board allows the user to program how its output voltage ramps up and down through the track_control pin. the output voltage is tightly regulated between vout + and vout – through remote output voltage sensing which improves output voltage regulation at heavy loads. these features and the availability of the ltm4620ev in a compact 15mm × 15mm × 4.41mm lga package make it ideal for use in many high density point-of-load regulation applications.
the ltm4620 data sheet must be read in conjunction with this demo manual prior to working on or modifying the demo circuit dc1780a-c.
图.100a多相演示板1780a-c外形图
图.100a多相演示板1780a-c电路图(1)
图.100a多相演示板1780a-c电路图(2)
图.100a多相演示板1780a-c电路图(3)
图.100a多相演示板1780a-c电路图(4)
100a多相演示板1780a-c材料清单(bom):
图.100a多相演示板1780a-c pcb元件布局图(顶层)
图.100a多相演示板1780a-c pcb元件布局图(底层)
linear公司的ltm4620是完整的双路13a输出开关模式dc/dc转换器,集成了开关控制器,功率fet,电感和所有支持元件.输入电压4.5v-16v,输出电压0.6v-2.5v,多个应用时输出电流高达100a,可调开关频率,频率同步,过流保护,内部温度检测二极管输出,输出过压保护,主要用在通信和网络设备,存储器和atca卡,工业设备.本文介绍了ltm4620主要特性,简化框图和多种应用电路,00a多相演示板1780a-c主要特性,电路图,材料清单和pcb元件布局图.
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