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ZSPM4523 데이터시트(PDF) 17 Page - Integrated Device Technology |
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ZSPM4523 데이터시트(HTML) 17 Page - Integrated Device Technology |
17 / 24 page ZSPM4523 Datasheet © 2016 Integrated Device Technology, Inc. 17 January 29, 2016 4 Application Circuits 4.1. Typical Application Circuits Figure 4.1 Application Circuit GND EN SW NFLT VOUT SCL PGND COUT LOUT RSENSE VIN SDA Photovoltaic Cells VSENSE Super Cap RPULLUP (optional) VDD RPULLUP (optional) VDD CIN VDD CVdd ZSPM4523 4.2. Selection of External Components Note that the internal compensation is optimized for a 4.7µF output capacitor (COUT) and a 4.7µH output inductor (LOUT). Table 1.3 provides recommended ranges for most of the following components. 4.2.1. COUT Output Capacitor To keep the output ripple low, a low ESR (less than 35m Ω) ceramic capacitor is recommended for the 4.7µF output filter capacitor. The ESR should not exceed 100m Ω. 4.2.2. LOUT Output Inductor For best performance, an inductor with a saturation current rating higher than the maximum VOUT load requirement plus the inductor current ripple should be used for the 4.7µH output filter inductor. 4.2.3. CIN Bypass Capacitor for Input from Photovoltaic Source For best performance, a low ESR ceramic capacitor should be used for the 10µF input supply bypass capacitor. If it is not a low ESR ceramic capacitor, a 0.1µF ceramic capacitor should be added in parallel to CIN. 4.2.4. CVDD Bypass Capacitor for VDD Internal Reference Voltage Output For best performance, a low ESR ceramic capacitor should be used for the100nF bypass capacitor from the VDD pin to ground. |
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