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DAP011 датащи(PDF) 21 Page - ON Semiconductor

номер детали DAP011
подробное описание детали  PWM Current−Mode Controller for High−Power Universal Off−Line Supplies
PDF  24 Pages
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

DAP011 датащи(HTML) 21 Page - ON Semiconductor

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DAP011/DAP011C
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@ Lp @ Ip2Fsw + 4W
(eq. 4)
If this IC enters skip cycle mode with a bunch length of
10 ms over a recurrent period of 100 ms, then the total power
transfer is: 4.
0.1 = 400 mW.
To better understand how this skip cycle mode takes place,
a look at the operation mode versus the FB level
immediately gives the necessary insight:
5.0 V, FB Pin open
3.0 V upper dynamic range
Normal Current Mode Operation
1.0 V
Skip−cycle Operation
Ip min = 350 mV/Rsense
FB Pin Voltage
Figure 36.
When FB is above the skip cycle threshold (1.0 V by
default), the peak current cannot exceed 1.0 V / Rsense.
When the IC enters the skip cycle mode, the peak current
cannot go below 1.0 V / 3 or around 350 mV / Rsense.
Figure 38 shows different values of pulse widths when the
SMPS starts−to−skip cycles at different power levels:
Figure 37. Output Pulses at Various Power Levels (X = 5
ms/div) P1 < P2 < P3
Power P1
Power P2
Power P3



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