R1218X Ricoh Corporation, R1218X Datasheet - Page 12

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

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DataSheet
12
R1218X
7.
7-1. Duty vs. LED Current (Topt=25 C)
7-2. Output Voltage Waveform (Topt=25 C)
8. VFB Voltage vs. Temperature
4
PWM Dimming Control (6 LED)
U
50
40
30
20
10
0.215
0.205
0.195
0.185
22.5
17.5
12.5
.com
0
0.21
0.19
7.5
2.5
25
20
15
10
0.2
0
5
0
0
-50
R1218X062A
0.8
-25
20
CE Input Voltage
Output Voltage
R1218x041A
Temperature Topt (°C)
1.6
R1218X062A
Time (ms)
0
40
DUTY (%)
2.4
25
60
Fosc=200Hz
VIN=3.6V,R1=10Ω
50
3.2
80
V
75
IN
5kHz
1kHz
200Hz
4
=3.6V
10
5
0
100
100
9. UVLO Detector Threshold/Released Voltage vs. Temperature
1.66
1.62
1.58
1.54
50
40
30
20
10
1.7
1.5
0
0
-50
R1218X062A
0.04
-25
CE Input Voltage
Output Voltage
Temperature Topt ( C)
0.08
R1218x041A
0
Time (ms)
0.12
25
UVLO Detector
UVLO Released
50
0.16
Fosc=5kHz
V
75
IN
0.2
=3.6V
10
5
0
100