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MB3782 Datasheet(PDF) 23 Page - Fujitsu Component Limited. |
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MB3782 Datasheet(HTML) 23 Page - Fujitsu Component Limited. |
23 / 27 page MB3782 23 • Reference data Changing the smoothing capacitor from an aluminum electrolytic capacitor (RC ≅ 1.0Ω) to a lower-ESR semi- conductor electrolytic capacitor (OS capacitor: RC ≅ 0.2 Ω) decreases the phase margin (see Graphs 2, 3). V out V0 + CNF FB – + – IN + IN R1 R2 VIN VREF/2 Error amp AV and phase characteristics measured between these points Figure 8 Measurement of DC/DC Capacitor AV and Phase ( Ψ) Characteristics + – DC/DC converter + 5 V output frequency vs.gain and phase Frequency f (Hz) Aluminum electrolytic capacitor 220 µF (16 V) RC ≅ 1.0 Ω : fosc = 1 kHz 10 100 1 k 10 k 100 k – 40 – 20 0 20 40 60 Av φ 62° Vcc = 10 v RL = 25 Ω Cp = 0.1 µF – 90 0 – 180 90 180 V0 + + – 10 – 40 – 20 0 20 40 60 Frequency f (Hz) 100 1 k 10 k 100 k – 90 0 – 180 90 180 DC/DC converter + 5 V output frequency vs.gain and phase Vcc = 10 v RL = 25 Ω Cp = 0.1 µF OS capacitor 22 µF (16 V) RC ≅ 0.2 Ω : fosc = 1 kHz Av φ 27° Graph 2 Graph 3 |
Similar Part No. - MB3782_1 |
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Similar Description - MB3782_1 |
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