MC34280 查看數據表（PDF） - ON Semiconductor

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MC34280

Power Supply & Management IC for Handheld Electronic Products

ON Semiconductor 

MC34280

Cycle Starts

VREF

Feedback Voltage

tdl

M1 ON

tdh

M2 OFF

Ipk

M1 OFF

M2 ON

M1 ON

M2 OFF

TON

Loading Current, ILOAD

Coil Current

TSW

VMAIN

VMAIN + 1 V

M1 OFF

M2 ON

M1 ON

M2 OFF

M1 OFF

M2 ON

V@SW

0V

VMAIN Zoom–In

Feedback Voltage

VREF

tdl

Figure 21. Waveforms of Continuous Conduction Mode

Cycle Starts

M1 ON

M2 OFF

M1 OFF

tdh

M1 ON

M2 OFF

M1 OFF

M1 ON

M2 OFF

Ipk

TON

Loading Current, ILOAD

Coil Current

VMAIN + 1 V

VMAIN

V@SW

TSW

VIN

0V

VMAIN Zoom–In

Figure 22. Waveforms of Discontinuous Conduction Mode

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12

M1 OFF

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