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