R1218N021A Datasheet, PDF (15/21 Pages) RICOH electronics devices division – Step-up DC/DC converter for White LED Backlight

15) OVP Transient Response (Topt=25°C)
R1218x021A
15.0
12.5
OVP Voltage
10.0
7.5
5.0
2.5
0
0
20 40
60 80 100
Time (ms)
R1218x062A
35
30 ^{OVP Voltage}
25
20
15
10
5
0
0
20 40 60 80 100
Time (ms)
16) Efficiency dependence on inductors (4 LED)
R1218x041A (Intemal Diode Type)
VIN=3.6V
90
85
80
75
70
65
60
55
50
0
LQH32CN220K53
LQH32CN100K53
GLF2012T220K
GLF2012T100K
5
10
15
20
LED Current lLED (mA)
R1218x
R1218x041A
25
OVP Voltage
20
15
10
5
0
0
20 40
60 80 100
Time (ms)
15