MVME2604-1131B
而采用開關(guān)穩(wěn)壓器又產(chǎn)生了新的挑戰(zhàn)。由于電感器要求使用額外的區(qū)域,因此開關(guān)穩(wěn)壓器形狀因數(shù)較大??紤]穩(wěn)壓器開關(guān)頻率與測量信號頻率之間的關(guān)系。
因此,轉(zhuǎn)換器的布局更加關(guān)鍵。設(shè)計(jì)不良的開關(guān)穩(wěn)壓器會提高本底噪聲,并產(chǎn)生不必要的電磁兼容性(EMC),將會干擾小型信號的檢測。
幸運(yùn)的是,我們目前提供了集成電感器DC/DC開關(guān)穩(wěn)壓器,可以大限度地減少此類挑戰(zhàn)。電感器的集成不僅減小了開關(guān)節(jié)點(diǎn)的面積,還可以更輕松地實(shí)現(xiàn)佳布局。新型DC/DC轉(zhuǎn)換器的開關(guān)頻率顯著提高,因此可以使用小型片式電感器和陶瓷電容器,使得DC/DC轉(zhuǎn)換器成為外形小的選擇。
新型LMZM23601電源模塊將DC/DC轉(zhuǎn)換器、電感器、Vcc濾波電容器和升壓電容器集成到一個(gè)3mm*3.8mm*1.6mm的封裝中。這樣可以處理高36V的輸入電壓,并將電壓從15V降至2.5V(固定5V和3.3V可選),同時(shí)輸出電流高達(dá)1A。如圖1所示,占用小的板內(nèi)空間實(shí)現(xiàn)完整的1A解決方案。
MVME2604-1131B
MVME2604-1131B
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