R1218X Ricoh Corporation, R1218X Datasheet - Page 11

• Manufacturer Part Number: R1218X
• Description: Step Up DC/DC Converter
• Manufacturer: Ricoh Corporation

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DataSheet
4
5-2. Output Voltage Waveform (Topt=25 C)
6. PWM Dimming Control (4 LED)
6-1. Duty vs. LED Current (Topt=25 C)
6-2. Output Voltage Waveform
U
.com
25
20
15
10
22.5
17.5
12.5
50
40
30
20
10
5
0
7.5
2.5
0
25
20
15
10
5
0
0
0
0
R1218X021A
R1218X041A
0.8
0.8
Output Voltage
CE Input Voltage
20
Output Voltage
CE Input Voltage
1.6
1.6
R1218X041A
Time (ms)
Time (ms)
40
DUTY (%)
2.4
2.4
60
Fosc=200Hz
Fosc=200Hz
V
3.2
3.2
IN
=3.6V, R1=10Ω
80
5kHz
1kHz
200Hz
4
4
10
5
0
10
5
0
100
25
20
15
10
50
40
30
20
10
5
0
0
0
0
R1218X021A
0.04
0.04
CE Input Voltage
Output Voltage
CE Input Voltage
Output Voltage
R1218X041A
0.08
0.08
Time (ms)
Time (ms)
0.12
0.12
Fosc=5kH
0.16
0.16
Fosc=5kHz
0.2
0.2
R1218X
10
5
0
10
5
0
11