MD3221N 查看數據表（PDF） - Unspecified

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MD3221N

DC-DC Converter Power IC

Unspecified 

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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