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DAP011

PWM Current−Mode Controller for High−Power Universal Off−Line Supplies

ON Semiconductor 

DAP011/DAP011C

1

2

@

Lp

@

Ip2Fsw

+

4

W

(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:

FB Pin Voltage

Normal Current Mode Operation

5.0 V, FB Pin open

3.0 V upper dynamic range

Skip−cycle Operation

Ip min = 350 mV/Rsense

1.0 V

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:

Power P1

Power P2

Power P3

Figure 37. Output Pulses at Various Power Levels (X = 5 ms/div) P1 < P2 < P3

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