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IL2595-XX Datasheet(PDF) 9 Page - IK Semicon Co., Ltd |
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IL2595-XX Datasheet(HTML) 9 Page - IK Semicon Co., Ltd |
9 / 12 page IL2595-xx Input power sources that are current limited or sources that can not deliver these currents without getting loaded down, may not work correctly. Because of the relatively high startup currents required by the inverting topology, the delayed startup feature (C1, R1 and R2) shown in Figure 6 is recommended. By delaying the regulator startup, the input capacitor is allowed to charge up to a higher voltage before the switcher begins operating. A portion of the high input current needed for startup is now supplied by the input capacitor (CIN). For severe start up conditions, the input capacitor can be made much larger than normal. INVERTING REGULATOR SHUTDOWN METHODS To use the ON /OFF pin in a standard buck configuration is simple, pull it below 1.3V (@25°C, referenced to ground) to turn regulator ON, pull it above 1.3V to shut the regulator OFF. With the inverting configuration, some level shifting is required, because the ground pin of the regulator is no longer at ground, but is now setting at the negative output voltage level. Two different shutdown methods for inverting regulators are shown in Figure 8 and Figure 9. FIGURE 8. Inverting Regulator Ground Referenced Shutdown FIGURE 9. Inverting Regulator Ground Referenced Shutdown using Opto Device 9 Rev. 00 |
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