R1218K021A RICOH [RICOH electronics devices division], R1218K021A Datasheet - Page 13

• Manufacturer Part Number: R1218K021A
• Description: Step-up DC/DC converter for White LED Backlight
• Manufacturer: RICOH [RICOH electronics devices division]

7) PWM Dimming Control (6 LED) V
8) V
7-1. Duty vs. LED Current (Topt=25°C)
7-2. Output Voltage Waveform (6 LED) (Topt=25°C)
FB
Voltage vs. Temperature
10
0.215
0.210
0.205
0.200
0.195
0.190
0.185
20
25.0
22.5
20.0
17.5
15.0
12.5
10.0
0
7.5
5.0
2.5
0
-40
0
0
CE Input Voltage
-25
Output Voltage
20
0.8
R1218x062A
R1218x062A
R1218x041A
Temperature Topt (°C)
0
Time (ms)
40
Duty (%)
1.6
25
60
2.4
fosc=200Hz
50
80
5kHz
1kHz
200Hz
V
IN
3.2
IN
=3.6V, R1=10Ω
=3.6V
75 85
100
10
5
0
9) UVLO Detector Threshold/Released Voltage vs. Temperature
10
20
1.74
1.70
1.66
1.62
1.58
1.54
1.50
0
-40
0
-25
CE Input Voltage
Output Voltage
0.04
Temperature Topt (°C)
UVLO Released
R1218x062A
R1218x041A
UVLO Detector
0
Time (ms)
0.08
25
0.12
fosc=5kHz
50
V
0.16
IN
=3.6V
75 85
R1218x
10
5
0
13