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IR3521 Datasheet(PDF) 32 Page - International Rectifier |
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IR3521 Datasheet(HTML) 32 Page - International Rectifier |
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32 / 45 page  IR3521 Page 32 V3.03 When a step load is applied, the capacitor acts as a short-circuit, at that instant, and pushes the OCSET signal up by ∆V (i.e. change in IIN) instantaneously. After an increase in its level, the OCP signal starts decaying exponentially towards its original value. The rate of decay is determined by the RC time constant. The VR will enter hiccup mode when the OCSET signal falls below the IIN value. The following equation (18) is use to calculate the ideal capacitor value: , _ _ TDC spike OC spike OC oc spike Spike IDD I I I I In R t C (18) where, tspike_oc = IDD_Spike OC time (choose >1.5ms), Roc = OC resistor (TDC), Ispike = IDD_Spike Max, IOC = TDC OC Threshold, ITDC = Thermal Design Current. The following graph shows a dynamic OC response with tspike set for 1.5ms. Figure X: Figure 20 Showing Dynamic OC Response TDC OC Threshold IDD_Spike Boundary IDD_Spike OC Threshold tspike_oc TDC OC Threshold IDD_Spike Boundary IDD_Spike OC Threshold tspike_oc |
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