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RP110L361C-TR Datasheet(PDF) 9 Page - RICOH electronics devices division |
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RP110L361C-TR Datasheet(HTML) 9 Page - RICOH electronics devices division |
9 / 37 page RP110x NO.EA-239-140522 9 CONSTANT SLOPE CIRCUITS The RP110x Series is equipped with a constant slope circuit as a soft-start circuit, which allows the output voltage to start up gradually when the CE is turned on. The constant slope circuit minimizes the inrush current at the start-up and also prevents the overshoot of the output voltage. The capacitor to create the start-up slope is built in the IC that does not require any external components. The start-up time and the start-up slope angle are fixed inside the IC. If the capacitance of the external output capacitor (COUT) becomes more than the certain capacitance, the output current limit circuit minimizes the incoming current of the output capacitor at the start-up. As a result, the start-up time becomes longer and the start-up slope angle becomes more gentle. As “Inrush Current Characteristics Example” below shows, if the COUT is less than 4.7µF, the constant slope circuit easily starts to function at the start-up, likewise, if the COUT is over 10µF, the output current limit circuit easily starts to function at the start-up. The boundary point of using these two circuits is inversely proportional to the output voltage. If the output voltage is higher, the output current limit circuit easily starts to function even if the COUT capacitance is small. For more details, please refer to the graph 14 of “Inrush Current Characteristics Example”. Inrush Current Characteristics Example (C1=none, IOUT=0mA, Topt=25ºC) RP110x25xB/D 50 150 250 350 0 100 200 300 400 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 50 150 100 250 200 350 300 0 Output Voltage CE Input Voltage Inrush Current VIN=3.5V COUT=0.1 μF COUT=1.0 μF COUT=2.2 μF COUT=4.7 μF COUT=10 μF Time t ( μs) |
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