NCP1622 datasheet(10/20 Pages) ONSEMI

Part #	NCP1622

Description	Enhanced, High-Efficiency Power Factor Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1622

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10

High Current

No delay

è CrM

Low Current

The next cycle is

delayed

Lower Current

Timer delay

Longer dead−time

Timer delay

Figure 3. Valley Switching Operation in CrM and DCM Modes

As illustrated in Figure 3, under high load conditions, the

boost stage is operating in CrM but as the load is reduced, the

controller enters controlled frequency discontinuous

operation.

To further reduce the losses, the MOSFET turns on is

stretched until its drain−source voltage is at its valley. The

end of the dead time is synchronized with the drain−source

ringing.

VALLEY SYNCHRONIZED FREQUENCY FOLDBACK (VSFF)

a/ Valley Synchronized (VS)

DRV

200−us

WATCHDOG

CS/ZCD

ZCD TIMER

Zero Current Detection

Dead−Time (DT)

Ramp for DT Control

Clock Generation

DRV

DT

CLK

Vcsint

Vctrl

ZCD

DEMAG

SENSING

CSZCD

BUFFER

DEAD TIME

GENERATOR

END OF DEMAG

SENSING

END OF DEAD TIME

SYNCHRONIZATION

DRV

VCTRL

Figure 4. Valley Synchronized Turn−on Block Diagram

Valley Synchronized is the first half of the VSFF system.

Synchronizing the Turn−on with the drain voltage valley

maximizes the efficiency at both nominal and light load

conditions. In particular, the stand−by losses are reduced to

a minimum. The synchronization of Power MOSFET

Turn−on (rising edge of CLK signal) with drain voltage

valley is depicted on Figure 4. This method avoids system

stalls between valleys. Instead, the circuit acts so that the

PFC controller transitions from the n valley to (n+1) valley

or vice versa from the n valley to (n−1) cleanly as illustrated

by the simulation results of Figure 5. When the Line voltage

and inductor current are very low, or when the amplitude of

the drain voltage gets too low (in the case of long dead

times), the turn−on of the power MOSFET is no longer

synchronized with the drain valley but will start exactly at

the end of a programmed dead time looks to the ZCD

TIMER block.

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NCP1622 Datasheet(PDF) 10 Page - ON Semiconductor

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