MAX5073雙通道降壓轉(zhuǎn)換器工作于2MHz開(kāi)關(guān)頻率的參考設(shè)計(jì)
實(shí)際測(cè)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(jiàn)表2和表3。
表2. VOUT2禁止時(shí)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 (%) |
14.007 | 0.065732 | 3.3371 | 0.1018 | 36.8973371 |
14.010 | 0.183690 | 3.3339 | 0.5122 | 66.3542117 |
14.005 | 0.267750 | 3.3321 | 0.8032 | 71.3722082 |
14.007 | 0.329490 | 3.3309 | 1.0112 | 72.9812485 |
14.005 | 0.449290 | 3.3298 | 1.4007 | 74.1230723 |
14.002 | 0.584520 | 3.3281 | 1.8203 | 74.0201375 |
14.001 | 0.650260 | 3.3267 | 2.0150 | 73.6279304 |
表3. VOUT1禁止時(shí)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 (%) |
14.008 | 0.044533 | 2.5350 | 0.1075 | 43.6845979 |
14.008 | 0.067144 | 2.5337 | 0.2049 | 55.1967881 |
14.003 | 0.087638 | 2.5337 | 0.3010 | 62.1452787 |
14.004 | 0.109076 | 2.5337 | 0.4003 | 66.3986847 |
14.005 | 0.133680 | 2.5337 | 0.5122 | 69.3178710 |
14.005 | 0.155350 | 2.5338 | 0.6097 | 71.0058542 |
14.008 | 0.255976 | 2.5334 | 1.0001 | 70.6597037 |
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(shuō)明了每路輸出的增益和相位。
圖2. 3.3V/1.4A VOUTPUT波特圖
圖3. 2.5V/0.6A VOUTPUT波特圖
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