RH5RI251B Просмотр технического описания (PDF) - RICOH Co.,Ltd.
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RH5RI251B Datasheet PDF : 24 Pages
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RH5RI
• RH5RI501B
Symbol
VOUT
VIN
Vstart
Vhold
Item
Output Voltage
Input Voltage
Start-up Voltage
Hold-on Voltage
IIN1
Input Current 1
Conditions
IOUT=1mA,VIN:0→2V
IOUT=1mA,VIN:2→0V
To be measured at VIN
at no load
MIN.
TYP. MAX.
VOUT=5.0V
Unit Note
4.875 5.000 5.125 V
8
V
0.8 0.9
V
0.7
V
6
12 µA
IIN2
Input Current 2
ILX
ILXleak
fosc
Maxdty
η
VLXlim
Lx Switching Current
Lx Leakage Current
Maximum Oscillator
Frequency
Oscillator Duty Cycle
Efficiency
VLX Voltage Limit
To be measured at VIN
VIN=5.5V
VLX=0.4V
VLX=6V,VIN=5.5V
2
5
µA
80
mA
0.5 µA
80 100 120 kHz
on (VLX “L” ) side
Lx Switch On
65
75
85
70
80
0.65 0.8 1.0
%
%
V Note2
Unless otherwise provided, VIN=3V, Vss=0V, IOUT=10mA, Topt=25˚C, and use External Circuit of Typical
Application (FIG. 1).
(Note)
ILX is gradually increased by the external inductor after Lx Switch is turned ON. In accordance with the increase of ILX, VLX is also increased.
When VLX reaches VLXlim, Lx Switch is turned OFF by Lx Switch Protection Circuit. The time period from the time at which VLX reaches VLXlim to
the time at which Lx Switch is turned OFF is about 3µs.
6
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