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RP107Z101D-TR-F Datasheet(PDF) 8 Page - RICOH electronics devices division

Part # RP107Z101D-TR-F
Description  Supply Current Typ. 9.5uA
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RP107Z101D-TR-F Datasheet(HTML) 8 Page - RICOH electronics devices division

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RP107x
NO.EA-181-131018
8
CONSTANT SLOPE CIRCUITS
The RP107x 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 2.2µF, the constant slope circuit easily starts to
function at the start-up, likewise, if the COUT is over 4.7µF, 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 15 of “Inrush Current Characteristics Example”.
Inrush Current Characteristics Example (C1
=0.1μF, Topt=25°C)
RP107x101xB/D
RP107x281xB/D
40
80
120
160
20
0
60
100
140
180
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
Output Voltage
CE Input Voltage
Inrush Current
VIN=2.0V
Time t (
µs)
50
150
100
250
200
350
400
450
300
0
COUT=0
µF
COUT=0.1
µF
COUT=1.0
µF
COUT=2.2
µF
COUT=4.7
µF
40
80
120
160
20
0
60
100
140
180
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Output Voltage
CE Input Voltage
Inrush Current
Time t (
µs)
40
120
80
200
160
280
320
360
240
0
COUT=0
µF
COUT=0.1
µF
COUT=1.0
µF
COUT=2.2
µF
COUT=4.7
µF
VIN=3.8V
RP107x421xB/D
40
80
120
160
20
0
60
100
140
180
6
5
4
3
2
1
0
Output Voltage
CE Input Voltage
Inrush Current
VIN=5.2V
Time t (
µs)
60
180
120
300
240
360
0
COUT=0
µF
COUT=0.1
µF
COUT=1.0
µF
COUT=2.2
µF
COUT=4.7
µF
*RP107N (SOT-23-5) is the non-promotion product. As of June in 2016.


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