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AAT1153 数据表(PDF) 18 Page - Advanced Analogic Technologies |
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AAT1153 数据表(HTML) 18 Page - Advanced Analogic Technologies |
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18 / 19 page ![]() AAT1153 2A Step-Down Converter PRODUCT DATASHEET 18 1153.2008.02.1.2 www .analogictech.com AAT1153 2A Step-Down Converter PRODUCT DATASHEET 18 1153.2008.02.1.2 www .analogictech.com Input Capacitor Input ripple VPP = 25mV CIN(MIN) = = = 13.9µF; use 22µF 1 ⎛⎞ - ESR · 4 · fS ⎝⎠ VPP IO 1 ⎛⎞ - 0.01 · 4 · 1.2 · 106 ⎝⎠ 0.025 2 IO RMS I PCIN = ESR · IRMS2 = 0.01 · 12 = 10mW 2 2 2 = = = 1Arms AAT1153 Losses P TOTAL = IO 2 · R DS(ON)P · D + IO 2 · R DS(ON)N · (1 - D) + (tSW · fS · IO) · VIN = 22 · 0.135 · + 22 · 0.095 · 1 - 1.8 4.2 + (5 · 10-9 · 1.2 · 106 · 2) · 4.2 = 498.9mW 1.8 4.2 ⎛⎞ ⎝⎠ |
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