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MIC2013-0.5YML Datasheet(PDF) 24 Page - Micrel Semiconductor |
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MIC2013-0.5YML Datasheet(HTML) 24 Page - Micrel Semiconductor |
24 / 30 page Micrel, Inc. MIC20xx Family August 2011 24 M9999-080211-D ILIMIT vs. IOUT Measured The MIC20XX’s current-limiting circuitry, during current limiting, is designed to act as a constant current source to the load. As the load tries to pull more than the allotted current, VOUT drops and the input to output voltage differential increases. When VIN - VOUT exceeds 1V, IOUT drops below ILIMIT to reduce the drain of fault current on the system’s power supply and to limit internal heating of the switch. When measuring IOUT it is important to bear this voltage dependence in mind, otherwise the measurement data may appear to indicate a problem when none really exists. This voltage dependence is illustrated in Figures 4 and 5. In Figure 4, output current is measured as VOUT is pulled below VIN, with the test terminating when VOUT is 1V below VIN. Observe that once ILIMIT is reached IOUT remains constant throughout the remainder of the test. In Figure 5 this test is repeated but with VIN - VOUT exceeding 1V. When VIN - VOUT > 1V, switch’s current limiting circuitry responds by decreasing IOUT, as can be seen in Figure 5. In this demonstration, VOUT is being controlled and IOUT is the measured quantity. In real life applications VOUT is determined in accordance with Ω’s law by the load and the limiting current. Figure 4. IOUT in Current Limiting for VIN - VOUT < 1V Figure 5. IOUT in Current Limiting for VIN - VOUT > 1V This folding back of ILIMIT can be generalized by plotting ILIMIT as a function of VOUT, as shown below in Figures 6 and 7. The slope of VOUT between IOUT = 0V and IOUT = ILIMIT (where ILIMIT = 1A) is determined by RON of the switch and ILIMIT. 0 0.2 0.4 0.6 0.8 1.0 1.2 01 2345 6 OUTPUT VOLTAGE (V) Normalized Output Current vs. Output Voltage (5V) Figure 6. Normalized Output Current vs. Output Voltage |
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