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| MIC4680 Datasheet, PDF (7/16 Pages) Micrel Semiconductor – 1A 200kHz SuperSwitcher™ Buck Regulator Final Information | |||
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MIC4680
Micrel
Bode Plots
The following bode plots show that the MIC4680 is stable over all conditions using a 68µF inductor (L) and a 220µF output
capacitor (COUT). To assure stability, it is a good practice to maintain a phase margin of greater than 35°.
No-Load Stability
Phase Margin = 106°
Full-Load Stability
Phase Margin = 114°
L = 68µF
COUT = 220µF
VIN = 7V
VOUT = 5.0V
IOUT = 0.0A
L = 68µF
COUT = 220µF
TIME (100ms/div.)
No-Load Stability
Phase Margin = 117°
VIN = 7V
VOUT = 5.0V
IOUT = 1.0A
TIME (100ms/div.)
Full-Load Stability
Phase Margin = 69°
L = 68µF
COUT = 220µF
VIN = 12V
VOUT = 5.0V
IOUT = 0.0A
L = 68µF
COUT = 220µF
TIME (100ms/div.)
No-Load Stability
Phase Margin = 125°
L = 68µF
COUT = 220µF
VIN = 12V
VOUT = 5.0V
IOUT = 1.0A
TIME (100ms/div.)
Full-Load Stability
Phase Margin = 71°
L = 68µF
COUT = 220µF
VIN = 34V
VOUT = 5.0V
IOUT = 1.0A
TIME (100ms/div.)
VIN = 34V
VOUT = 5.0V
IOUT = 1.0A
TIME (100ms/div.)
June 2000
7
MIC4680
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