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CPC1560GS Datasheet(PDF) 11 Page - Clare, Inc. |
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CPC1560GS Datasheet(HTML) 11 Page - Clare, Inc. |
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11 / 14 page ![]() CPC1560 R00F PRELIMINARY 11 5.6 Rise and Fall Times The CPC1560 has rise and fall times that are primarily limited by internal parasitic elements of the device; the load components only play a secondary role. This can be appreciated in the turn-off graph of an application circuit operating at 45V, where the slope of the load voltage starts scooping down into a more capacitive shape after approximately 15 volts. 5.7 Over-Voltage Protection 5.7.1 Stored Energy in the Load During the CPC1560’s switching periods, energy is transferred between the load components, the CPC1560 device, and, if used, the over-voltage protection circuitry. When the output switch turns off, inductive loads (LLOAD) transfer their stored energy into the MOSFET switches, the load capacitance, and the over-voltage protector. (See the turn-off graph for a 45V inductive load application circuit.) When the output switch turns on, the energy in the load inductor is zero, and the load capacitor (CLOAD) must transfer its stored energy into the MOSFET. Time ( μs) -80 -40 -20 0 20 40 0 20 30 40 50 0.0 0.4 0.6 0.8 1.0 CPC1560 DC-Only Application Circuit Resistive Load Turn-Off Characteristics (Supply=45V DC, RLOAD =75Ω) 80 60 10 0.2 -60 t RISE=46μs V L I L Time ( μs) -80 -40 -20 0 20 40 0 20 30 40 50 0.0 0.4 0.6 0.8 1.0 CPC1560 DC-Only Application Circuit Inductive Load Turn-Off Characteristics (Supply=45V, R LOAD =75Ω, LLOAD= 630μH) 80 60 10 0.2 -60 V L I L |
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