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MIC2289C-24YML Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC2289C-24YML Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 10 page Micrel, Inc. MIC2289C September 2006 8 M9999-090706 Start-Up and Inrush Current During start-up, inrush current of approximately double the nominal current flows to set up the inductor current and the voltage on the output capacitor. If the inrush current needs to be limited, a soft-start circuit similar to Figure 5 could be implemented. The soft-start capacitor, CSS, provides over-drive to the FB pin at start-up, resulting in gradual increase of switch duty cycle and limited inrush current. VIN EN 10k 2200pF SW OUT FB CSS R GND VIN Figure 5. One of Soft-Start Circuit 6-Series LED Circuit without External Soft-Start TIME (100µs/div.) L = 10µH C IN = 1µF COUT = 0.22µF VIN = 3.6V IOUT = 20mA 6 LEDs 6-Series LED Circuit with External Soft-Start TIME (100µs/div.) L = 10µH C IN = 1µF COUT = 0.22µF VIN = 3.6V IOUT = 20mA 6 LEDs C SS = 2200pF Figure 6. 6-Series LED Circuit without External Soft Start Figure 7. 6-Series LED Circuit with External Soft Start |
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