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RP110L251B-TR Datasheet(PDF) 9 Page - RICOH electronics devices division

Part # RP110L251B-TR
Description  Supply Current Typ. 1.0uA (Except the current through CE pull down circuit)
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RP110L251B-TR Datasheet(HTML) 9 Page - RICOH electronics devices division

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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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