R1230D Datasheet, PDF (17/20 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

14) Duty Cycle at VFM Mode vs. Temperature
80
75
70
65
60
55
50
-60
-40
-20
0
20
40
Temperature Topt ^(°C)
15) Lx Transistor On Resistance vs. Temperature
1
60
80
100
VIN=3.0V
0.75
0.5
0.25
Pch Tr. On Resistance
Nch Tr. On Resistance
0
-60
-40
-20
16) Limit Voltage vs. Temperature
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
-60
-40
-20
17) Load Transient Response
IOUT=0A
-4.00E-05 -2.00E-05 0.00E+00 2.00E-05
0
20
40
60
80
Temperature Topt ^(°C)
0
20
40
60
80
Temperature Topt (°C)
IOUT=100mA
4.00E-05 6.00E-05 8.00E-05 1.00E-04 1.20E-04 1.40E-04
R1230D181B VIN=5.0V PWM
Time[sec]
100
100
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
Rev. 1.12
- 17 -