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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT8331 датащи(PDF) 20 Page - Analog Devices |
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LT8331 датащи(HTML) 20 Page - Analog Devices |
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20 / 30 page  LT8365 20 Rev. A For more information www.analog.com APPLICATIONS INFORMATION Inverting Converter: Output Capacitor Selection The inverting converter requires much smaller output capacitors than those of the boost, flyback and SEPIC converters for similar output ripples. This is due to the fact that, in the inverting converter, the inductor L2 is in series with the output, and the ripple current flowing through the outputcapacitorsarecontinuous.Theoutputripplevoltage is produced by the ripple current of L2 flowing through the ESR and bulk capacitance of the output capacitor: ΔVOUT(P–P) = ΔIL2 • ESRCOUT + 1 8 • fOSC •COUT ⎛ ⎝ ⎜ ⎜ ⎞ ⎠ ⎟ ⎟ After specifying the maximum output ripple, the user can select the output capacitors according to the preceding equation. TheESRcanbeminimizedbyusinghighqualityX5RorX7R dielectricceramiccapacitors.Inmanyapplications,ceramic capacitors are sufficient to limit the output voltage ripple. The RMS ripple current rating of the output capacitor needs to be greater than: IRMS(COUT) > 0.3 • ∆IL2 Inverting Converter: Selecting the DC Coupling Capacitor The DC voltage rating of the DC coupling capacitor (CDC, as shown in Figure 8) should be larger than the maximum input voltage minus the output voltage (negative voltage): VCDC > VIN(MAX) + VOUT CDC has nearly a rectangular current waveform. During the switch off-time, the current through CDC is IIN, while approximately –IO flows during the on-time. The RMS rating of the coupling capacitor is determined by the fol- lowing equation: IRMS(CDC) >IO(MAX) • DMAX 1 − DMAX A low ESR and ESL, X5R or X7R ceramic capacitor works well for CDC. TYPICAL APPLICATIONS 400kHz, 9V to 30V Input, –250V Output Inverting Converter Efficiency 8365 TA03a C4 1µF C1 10µF C3 1nF C2 0.22µF R1 1M R2 3.24k R3 84.5k R4 107k D1 C5 0.22µF L1 10µH C6 0.1µF D2 R5 20 D3 R6 20 D4 C7 0.22µF C9 0.1µF EN/UVLO RT VIN SW FBX BIAS INTVCC SS GND VC LT8365 SYNC/MODE VIN VOUT 9V TO 30V –250V 10mA D1, D2, D3, D4: DIODES INC. DFLS1150 L1: WURTH ELEKTRONIK WE-PD 74437324100 C6, C9: 12062C104KAT2A C5, C7: CGJ5L3X7T2D224K160AA VOUT LOAD CURRENT (mA) 0 1 2 3 4 5 6 7 8 9 10 11 0 10 20 30 40 50 60 70 80 90 100 Efficiency 8365 TA03b |
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