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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP3913 датащи(PDF) 60 Page - Texas Instruments |
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LP3913 датащи(HTML) 60 Page - Texas Instruments |
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60 / 70 page  = + Vpp-esr 2 Vpp-rms 2 Vpp-c 2 4 * f * C Vpp-c = Iripple LP3913 SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013 www.ti.com The output filter capacitor of the magnetic DC/DC converter smooths out current flow from the inductor to the load, helps maintain a steady output voltage during transient load changes and reduces output voltage ripple. These capacitors must be selected with sufficient capacitance and sufficiently low ESD to perform these functions. The output voltage ripple is caused by the charging and the discharging of the output capacitor and also due to its ESR and can be calculated as follows: Voltage peak-to-peak ripple due to ESR can be expressed as follows: VPP-ESR = 2 * IRIPPLE * RESR (6) Because the VPP-C and VPP-ESR are out of phase, the RMS value can be used to get an approximate value of the peak-to-peak ripple: Note that the output voltage ripple is dependent on the inductor current ripple and the equivalent series resistance of the output capacitor (RESR). The RESR is frequency dependent as well as temperature dependent. The RESR should be calculated with the applicable switching frequency and ambient temperature. Capacitor Min Value Unit Description Recommended Type CVDD 4.7 μF Charger Input Capacitor Ceramic, 6.3V, X5R CCHG_DET 4.7 μF Charger Input Capacitor Ceramic, 6.3V, X5R CUSB 4.7 μF USB Power (VBUS) Ceramic, 6.3V, X5R Capacitor CBATT 4.7 μF Li-ion Battery Capacitor Ceramic, 6.3V, X5R CLDO1 1.0 μF LDO Output Capacitor Ceramic, 6.3V, X5R CLDO2 1.0 μF LDO Output Capacitor Ceramic, 6.3V, X5R CVREFH 0.1 μF Bypass Capacitor for Ceramic, PolyPropylene and Internal Voltage Polycarbonate Film Reference CVIN2,3 10 μF Buck1, Buck2 Input Ceramic, 6.3V, X5R Capacitor CVBUCK1,2 10 μF BUCK1,2 Output Ceramic, 6.3V, X5R Capacitor CSW3 22 μF BUCK3 Output Capacitor Ceramic, 6.3V, X5R CVIN1 1 μF LDO Bypass Capacitor Ceramic, 6.3V, X5R CVIN4 10 μF Buck Bypass Capacitor Ceramic, 6.3V, X5R Schottky Diode on Charger Input CHG_IN A Schottky diode is required in the external adapter path to block the reverse current from either the USB or the battery source. The most critical parameter in the selection of the right Schottky diode is the leakage current, which needs to be below 10 µA over the temperature range in order to prevent false detection of the presence of an external adapter. In addition the Schottky diode should have a maximum voltage rating of 10V or higher. The current rating depends on the current limit of the adapter. The forward voltage should be limited to 500 mV at its maximum current. The recommended Schottky diode is MBRA210ET3 from ON Semiconductor which has a reverse leakage current under 1 µA at room temperature and a forward voltage drop of 500 mV at their max rated current IF = 2A. 60 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LP3913 |
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