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)
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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(kāi)關(guān)頻率下的詳細(xì)參考設(shè)計(jì)。該設(shè)計(jì)可用于電路板空間受限的應(yīng)用，因?yàn)檩^高的開(kāi)關(guān)頻率允許采用更小尺寸的無(wú)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(hù))，即需要開(kāi)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(lè)系統(tǒng)。
該參考設(shè)計(jì)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(kāi)關(guān)頻率(fSW) = 2MHz
環(huán)境溫度(TA) = -40°C至+85°C
表1. 材料清單
| Designator | Value | Description | Part | Footprint | Manufacturer | Quantity |
| C1 | 100µF/35V | Capacitor | EEVFK1V101P | 8mm x 10.2mm | Panasonic | 1 |
| C2, C3, C4, C17, C18 | 0.1µF/25V | Capacitors | GRM188R71E104KA01D | 603 | Murata | 5 |
| C5, C6, C7 | 22µF/6.3V | Capacitors | GRM31CR60J226KE19 | 1206 | Murata | 2 |
| C8, C9 | 10µF/25V | Capacitors | GRM31CR61E106KA12 | 1206 | Murata | 1 |
| C10, C12 | 2.2nF | Capacitors | GRM188R71H222JA01 | 603 | Murata | 2 |
| C11 | 560pF | Capacitor | GRM188R71H561KA01 | 603 | Murata | 1 |
| C13, C14 | 22pF | Capacitors | GRM1885C1H220JA01 | 603 | Murata | 2 |
| C15 | 1nF | Capacitor | GRM18871H102KA01 | 603 | Murata | 1 |
| C16 | 4.7µF/6.3V | Capacitor | GRM188R60J475KE19B | 603 | Murata | 1 |
| C19 | 0.22µF/10V | Capacitor | GRM188R71A224KA01 | 603 | Murata | 1 |
| C20 | 0.01µF | Capacitor | GRM188R71H103KA01J | 603 | Murata | 1 |
| D1, D2 | 30V, 500mA | Schottky diodes | MBR0530 | SOD123 | ON Semiconductor | 2 |
| D3 | 40V, 3A | Schottky diode | MBRS340 | SMC | ON Semiconductor | 1 |
| D4 | 40V, 2A | Schottky diode | MBRS240 | SMB | ON Semiconductor | 1 |
| L1, L2 | 4.7µH | Inductors | IHLP2525-CZ | 6.86mm x 6.47mm x 3.18mm | Vishay | 1 |
| R1, R11 | 100kΩ | Resistors | SMD, 1%, 0.125W | 603 | Vishay | 2 |
| R2 | 6.8Ω | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R3 | 4.7Ω | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R4, R8, R10 | 1.18kΩ | Resistors | SMD, 1%, 0.125W | 603 | Vishay | 3 |
| R5, R9 | 27.4kΩ | Resistors | SMD, 1%, 0.125W | 603 | Vishay | 2 |
| R6 | 10kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R7 | 12.7kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R12 | 2.2Ω | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R13 | 6.19kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R14 | 8.76kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| U1 | MAX5073 | Dual buck converter | MAX5073ETI+ | 32-TQFN_EP (5mm x 5mm) | Maxim | 1 |
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