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	 > 模擬技術(shù) > 設(shè)計應(yīng)用 > MAX5073雙通道降壓轉(zhuǎn)換器工作于2MHz開關(guān)頻率的參考設(shè)
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          MAX5073雙通道降壓轉(zhuǎn)換器工作于2MHz開關(guān)頻率的參考設(shè)
          
						
          
				作者：
				時間：2011-04-01
				來源：網(wǎng)絡(luò)
				
				
				
				
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			本文給出了采用MAX5073雙通道降壓型轉(zhuǎn)換器、工作于2MHz開關(guān)頻率下的詳細(xì)參考設(shè)計。該設(shè)計可用于電路板空間受限的應(yīng)用，因為較高的開關(guān)頻率允許采用更小尺寸的無源元件。此外，該電源解決方案可用于汽車電子(帶有拋負(fù)載保護)，即需要開關(guān)頻率工作在AM調(diào)頻波段以外的產(chǎn)品。例如，汽車儀表盤和信息娛樂系統(tǒng)。

          該參考設(shè)計的關(guān)鍵規(guī)格在下面列出，并給出了應(yīng)用所需的詳細(xì)原理圖(圖1)及材料清單(表1)。

          規(guī)格
          • 輸入電壓：5.5V至16V 
          • 第1路轉(zhuǎn)換器輸出電壓 = 3.3V/2A (最大值) 
          • 第2路轉(zhuǎn)換器輸出電壓 = 2.5V/1A (最大值) 
          • 每路轉(zhuǎn)換器的開關(guān)頻率(fSW) = 2MHz 
          • 環(huán)境溫度(TA) = -40°C至+85°C 
          MAX5073雙通道降壓轉(zhuǎn)換器工作于2MHz開關(guān)頻率的參考設(shè)
          詳細(xì)電路圖(PDF)
          圖1. MAX5073參考設(shè)計

          表1. 材料清單 
          DesignatorValueDescriptionPartFootprintManufacturerQuantity
          C1100μF/35VCapacitorEEVFK1V101P8mm x 10.2mmPanasonic1
          C2, C3, C4, C17, C180.1μF/25VCapacitorsGRM188R71E104KA01D603Murata5
          C5, C6, C722μF/6.3VCapacitorsGRM31CR60J226KE191206Murata2
          C8, C910μF/25VCapacitorsGRM31CR61E106KA121206Murata1
          C10, C122.2nFCapacitorsGRM188R71H222JA01603Murata2
          C11560pFCapacitorGRM188R71H561KA01603Murata1
          C13, C1422pFCapacitorsGRM1885C1H220JA01603Murata2
          C151nFCapacitorGRM18871H102KA01603Murata1
          C164.7μF/6.3VCapacitorGRM188R60J475KE19B603Murata1
          C190.22μF/10VCapacitorGRM188R71A224KA01603Murata1
          C200.01μFCapacitorGRM188R71H103KA01J603Murata1
          D1, D230V, 500mASchottky diodesMBR0530SOD123ON Semiconductor2
          D340V, 3ASchottky diodeMBRS340SMCON Semiconductor1
          D440V, 2ASchottky diodeMBRS240SMBON Semiconductor1
          L1, L24.7μHInductorsIHLP2525-CZ6.86mm x 6.47mm x 3.18mmVishay1
          R1, R11100kΩResistorsSMD, 1%, 0.125W603Vishay2
          R26.8ΩResistorSMD, 1%, 0.125W603Vishay1
          R34.7ΩResistorSMD, 1%, 0.125W603Vishay1
          R4, R8, R101.18kΩResistorsSMD, 1%, 0.125W603Vishay3
          R5, R927.4kΩResistorsSMD, 1%, 0.125W603Vishay2
          R610kΩResistorSMD, 1%, 0.125W603Vishay1
          R712.7kΩResistorSMD, 1%, 0.125W603Vishay1
          R122.2ΩResistorSMD, 1%, 0.125W603Vishay1
          R136.19kΩResistorSMD, 1%, 0.125W603Vishay1
          R148.76kΩResistorSMD, 1%, 0.125W603Vishay1
          U1MAX5073Dual buck converterMAX5073ETI+32-TQFN_EP (5mm x 5mm) Maxim1

          實際測量電路獲得的數(shù)據(jù)給出了器件的效率指標(biāo)，詳細(xì)內(nèi)容參見表2和表3。 

          表2. VOUT2禁止時的效率指標(biāo)
          fSW = 2MHz、LOUT = 4.7μH、COUT = 22μF/6.3V (陶瓷電容) 
          VIN (V)IIN (A)VOUT1 (V)IOUT1 (A)Efficiency (%)
          14.0070.0657323.33710.101836.8973371
          14.0100.1836903.33390.512266.3542117
          14.0050.2677503.33210.803271.3722082
          14.0070.3294903.33091.011272.9812485
          14.0050.4492903.32981.400774.1230723
          14.0020.5845203.32811.820374.0201375
          14.0010.6502603.32672.015073.6279304

          表3. VOUT1禁止時的效率指標(biāo)
          fSW = 2MHz、LOUT = 4.7μH、COUT = 22μF/6.3V (陶瓷電容) 
          VIN (V)IIN (A)VOUT2 (V)IOUT2 (A)Efficiency (%)
          14.0080.0445332.53500.107543.6845979
          14.0080.0671442.53370.204955.1967881
          14.0030.0876382.53370.301062.1452787
          14.0040.1090762.53370.400366.3986847
          14.0050.1336802.53370.512269.3178710
          14.0050.1553502.53380.609771.0058542
          14.0080.2559762.53341.000170.6597037

          在穩(wěn)定性方面，圖2和圖3所示為每路輸出的波特圖，詳細(xì)說明了每路輸出的增益和相位。

          MAX5073雙通道降壓轉(zhuǎn)換器工作于2MHz開關(guān)頻率的參考設(shè)
          圖2. 3.3V/1.4A VOUTPUT波特圖

          MAX5073雙通道降壓轉(zhuǎn)換器工作于2MHz開關(guān)頻率的參考設(shè)
          圖3. 2.5V/0.6A VOUTPUT波特圖            
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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