NCP4355 データシートの表示（PDF） - ON Semiconductor

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NCP4355

Secondary Side SMPS OFF Mode Controller for Low Standby Power

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NO LOAD

NCP4355

LOAD IS CONNECTED

IOUT

Primary side start delay

VOUT

VCC

VREMprim

VOFFDET

IOUT

Secondary side detects low VOUT

VMIN level

Vout is

discharged faster

Primary off mode ends

Typical load detection behavior

NO LOAD

LOAD IS CONNECTED

VOUT

VCC

VREMprim

VMIN level

Primary side start delay

Primary off mode ends

T2 is conducting

VOFFDET

Voltage delivered through T2 and R16

Improved load detection behavior

Figure 29. Typical and Improved Load Detection Comparison Waveforms

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