NCP1075(2012) Ver la hoja de datos (PDF) - ON Semiconductor

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NCP1075
(Rev.:2012)

High-Voltage Switcher for Low Power Offline SMPS

ON Semiconductor 

NCP1072, NCP1075

Figure 31. Ipk Set−point is Frozen at Lower Power Demand.

Feedback and Skip

Figure 32 depicts the relationship between feedback

voltage and current. The feedback pin operates linearly as

the absolute value of feedback current (IFB) is above 40 mA.

In this linear operating range, the dynamic resistance is

19.5 kW typically (RFB(up)) and the effective pull up voltage

is 3.3 V typically (VFB(REF)). When IFB is below 40 mA, the

FB voltage will jump to close to 4.5 V.

Figure 32. Feedback Voltage vs. Current

Figure 33 depicts the skip mode block diagram. When the

FB current information reaches IFBskip, the internal clock to

set the flip−flop is blanked and the internal consumption of

the controller is decreased. The hysteresis of internal skip

comparator is minimized to lower the ripple of the auxiliary

voltage for VCC pin and VOUT of power supply during skip

mode. It easies the design of VCC over load range.

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