DMO7652RB データシートの表示（PDF） - Fairchild Semiconductor

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DMO7652RB

Green Mode Fairchild Power Switch ( DM0565R - DM07652RB)

Fairchild Semiconductor 

5. Burst operation : In order to minimize power dissipation

in standby mode, the FSDM0565RB enters burst mode

operation. As the load decreases, the feedback voltage

decreases. As shown in Figure 8, the device automatically

enters burst mode when the feedback voltage drops below

VBURL(500mV). At this point switching stops and the

output voltages start to drop at a rate dependent on standby

current load. This causes the feedback voltage to rise. Once

it passes VBURH(700mV) switching resumes. The feedback

voltage then falls and the process repeats. Burst mode

operation alternately enables and disables switching of the

power Sense FET thereby reducing switching loss in

Standby mode.

Vo

Voset

VFB

0.7V

0.5V

Ids

Vds

Switching

Switching

disabled

T1

T2 T3 disabled

T4

Figure 8. Waveforms of burst operation

time

FSDM0565RB

13

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