MD3221N データシートの表示（PDF） - Shindengen
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MD3221N Datasheet PDF : 26 Pages
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As the ON range remains constant irrespective of the
load applied, a stable response is obtained even under
rapid changes in load from the no-load condition. On
the other hand, as the actual current value
increases, input current at low-load increases
slightly in comparison with that at L cut ON.
● Transient Response with LC ON / OFF
LC : OFF
LC : ON
Conditions : Vi=5V, Vo=3.3V, output current 0A 3A
X axis : 100μs/div.
Y axis : 50mV/div.
Transient response may be optimized with error
amp gain adjustment (refer to 13 'Error Amp Gain
Adjustment' for details). For the graph above,
two 1200μF aluminum electrolytic condensers (C5)
were used for the output condenser, a 100pF
condenser for C6, and a 1MΩ resistor for R3.
Load current is extremely low, and the difference
shown in the diagram is obtained at the transient
response from the choke coil current cut-off region
(up to approximately 15% of the maximum output
current), however there is almost no difference in
transient response due to LC ON / OFF in the non-cut-
off region.
15
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