ncp1239f ON Semiconductor, ncp1239f Datasheet - Page 37

• Manufacturer Part Number: ncp1239f
• Description: Lowstandby High Performance Pwm Controller
• Manufacturer: ON Semiconductor

When the load current falls to a low level (CH4), the FB pin voltage diminishes to take into account the decay of the power
demand. As a consequence, the FB pin voltage goes below the “Vskip” threshold and the soft start timer counts about 100 ms
(if C
When the load current increases from 1A to 5A, the FB pin increases too so that the supplied power matches the new demand.
The normal mode is recovered without delay
pin6
= 330 nF). When the 100 ms time has elapsed, the PFC V
Figure 62. Transition Normal to Standby
Figure 63. Transition Standby to Normal
.
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NCP1239
37
CC
stops being fed.