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LTC3631EDD-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC3631EDD-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 22 page  LTC3631 9 3631fb OPERATION (Refer to Block Diagram) then the output voltage will be limited by the ramp rate on the SS pin instead. The internal and external soft-start functions are reset on start-up and after an undervoltage or overvoltage event on the input supply. In order to ensure a smooth start-up transition in any application, the internal soft-start also ramps the peak inductor current from 50mA during its 1ms ramp time to the set peak current threshold. The external ramp on the SS pin does not limit the peak inductor current during start-up; however, placing a capacitor from the ISET pin to ground does provide this capability. Peak Inductor Current Programming The offset of the peak current comparator nominally provides a peak inductor current of 225mA. This peak inductor current can be adjusted by placing a resistor from the ISET pin to ground. The 1μA current sourced out of this pin through the resistor generates a voltage that is translated into an offset in the peak current comparator, which limits the peak inductor current. Input Undervoltage and Overvoltage Lockout The LTC3631 implements a protection feature which dis- ables switching when the input voltage is not within the 4.5V to 45V operating range. If VIN falls below 4V typical (4.35V maximum), an undervoltage detector disables switching. Similarly, if VIN rises above 50V typical (47V minimum), an overvoltage detector disables switching. When switching is disabled, the LTC3631 can safely sustain input voltages up to the absolute maximum rating of 60V. Switching is enabled when the input voltage returns to the 4.5V to 45V operating range. |
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