MB39A105 Datasheet, PDF (8/27 Pages) Fujitsu Component Limited. – 1-ch DC/DC Converter IC for low voltage

MB39A105
Triangular Wave Oscillation Frequency
vs. Timing Resistor
10000
Ta = +25 °C
VCC = 3.3 V
1000
100
Triangular Wave Oscillation Frequency
vs. Ambient Temperature
600
VCC = 3.3 V
RT = 7.5 kΩ
550
500
450
10
1
10
100
Timing resistor RT (kΩ)
400
−40 −20 0
20 40 60 80 100
Ambient temperature Ta (°C)
Max On Duty vs.
Triangular Wave Oscillation Frequency
100
Ta = +25 °C
95
VCC = 3.3 V
90
85
80
75
70
10
100
1000
10000
Triangular wave oscillation frequency fOSC (kHz)
Error Amplifier Gain and Phase
vs. Frequency
40
Ta = +25 °C
VCC = 3.3 V
180
30
AV
ϕ
20
90
10 kΩ
240 kΩ
10
1 µF
+
10 ^−
0
−10
0
IN
2.4 kΩ
10 kΩ
11
+
+
9
OUT
−20
−90
Error Amp
−30
1.24 V
−40
−180
100 1 k 10 k 100 k 1 M 10 M
Frequency f (Hz)
8
(Continued)