FSDM07652RB
5. Burst operation :
In order to minimize power dissipation
in standby mode, the FSDM07652RB 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
V
BURL
(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 V
BURH
(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.
Figure 8. Waveforms of burst operation
V
FB
Vds
0.5V
0.7V
Ids
Vo
Vo
set
time
Switching
disabled
T1
T2 T3
Switching
disabled
T4
63
Summary of Contents for DW9937S
Page 1: ...SERVICE MANUAL DW9937S Ver 0 0 ...
Page 3: ...1 ...
Page 4: ...2 ...
Page 5: ...3 ...
Page 7: ...EXPLODED VIEW 5 5 ...
Page 15: ...14 13 ...
Page 16: ...15 14 ...
Page 17: ...16 15 ...
Page 18: ...17 IS2 16 ...
Page 22: ...MITSUMI I2 C BUS Control 5 Input 2 Output AV Switch MM1313 Equivalent Block Diagram 20 ...
Page 70: ...FSDM07652RB Package Dimensions TO 220F 6L Forming 68 ...
Page 74: ...72 ...
Page 75: ...11 Terminal for External Connection Outline Drawing 73 ...
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