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MB3775 Datasheet, PDF (13/25 Pages) Fujitsu Component Limited. – SWITCHING REGULATOR CONTROLLER
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MB3775
s TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 15 - Timing resistor vs. Oscillation Frequency
1M
Fig. 16 - Triangular waveform cycle vs. Timing capacitor
103
100k
102
10k
CT=150pF
101
Timing resistance=15kΩ
1k
CT=1500pF
100
VCC=6V
CT=15000pF
100
1K
10K
100K
1M
Timing resistor RT (Ω)
10M
10-1
101
102
103
104
Timing capacitor CT (pF)
Fig. 17 - Timing capacitor vs. Triangular waveform Max. Amplitude voltage Fig. 18 - Frequency vs. Gain/Phase
2.2
Timing resistance=15kΩ
60
VCC=6V
2.0
40
Gain
1.8
20
1.6
0
1.4
-20
Phase
105
180
90
0
-90
1.2
1.0
101
102
103
104
105
Timing capacitor CT (pF)
Fig. 19 - Frequency vs. Gain/Phase (Actual Data)
60
CFB=1µF
40
180
20
90
Gain
0
0
Phase
-20
-90
-40
-180
-60
100 101 102 103 104 105 106 107
Frequency f(Hz)
-40
-180
-60
1K
10K
100K
1M
Frequency f(Hz)
90
10M
Fig. 20 - Frequency vs. Gain/Phase (Actual Data)
60
CFB=0.1µF
40
180
20
90
Gain
0
0
Phase
-20
-90
-40
-180
-60
100 101 102 103 104 105 106 107
Frequency f(Hz)
13
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