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LNK520 Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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LNK520 Datasheet(HTML) 5 Page - Power Integrations, Inc. |
5 / 20 page 5 LNK520 E 2/05 Output Voltage Tolerance envelope without optocoupler Inherent CC to CV transition point Load variation during battery charging Voltage feedback threshold Characteristic with optocoupler Typical inherent characteristic without optocoupler PI-2788-092101 Output Current Output Voltage Output Current VO(MAX) Tolerance envelope without optocoupler Characteristic with optocoupler Power supply peak output power curve Typical inherent characteristic without optocoupler PI-2790-112102 Inherent CC to CV transition point Load variation during battery charging Characteristic observed with load variation often applied during laboratory bench testing Voltage feedback threshold Figure 7. Influence of the Optocoupler on the Power Supply Output Characteristic. Figure 8. Output Characteristic with Optocoupler Regulation (Reduced Voltage Feedback Threshold). is the characteristic seen if the voltage feedback threshold is above the output voltage at the inherent CC to CV transition point also indicated in Figure 7. Figure 8 shows a case where the voltage feedback threshold is set below the voltage at the inherent CC to CV transition point. In this case, as the output voltage rises, the secondary feedback circuit takes control before the inherent CC to CV transition occurs. In an actual battery charging application, this simply limits the output voltage to a lower value. However, in laboratory bench tests, it is often more convenient to test the power supply output characteristic starting from a low output current and gradually increasing the load. In this case, the optocoupler feedback regulates the output voltage until the peak output power curve is reached as shown in Figure 8. Under theseconditions,theoutputcurrentwillcontinuetoriseuntilthe peak power point is reached and the optocoupler turns off. Once the optocoupler is off, the CONTROL pin feedback current is determined only by R1 and the output current therefore folds back to the inherent CC characteristic as shown. Since this type of load transition does not normally occur in a battery charger, theoutputcurrentneverovershootstheinherentconstantcurrent value in the actual application. In some applications it may be necessary to avoid any output currentovershoot,independentofthedirectionofloadvariation. |
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