NCP1606BDR2G【PDF 18/22 页】IC POWER FACTOR CONTROLLER 8SOIC

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NCP1606

http://onsemi.com

Figure 37. OCP Circuitry with Optional External RC

Filter

OCP

LEB

DRIVE

optional

SENSE

CS(limit)

SHUTDOWN MODE

The NCP1606 allows for two methods to place the

controller into a standby mode of operation. The FB pin can

be pulled below the UVP level (0.3 V typical) or the ZCD

pin can be pulled below the V

SDL

level (typically 200 mV).

If the FB pin is used for shutdown (Figure 38(a)), care must

be taken to ensure that no significant leakage current exists

on the shutdown circuitry. This could impact the output

voltage regulation. If the ZCD pin is used for shutdown

(Figure 38(b)), then any parasitic capacitance created by

the shutdown circuitry will add to the delay in detecting the

zero inductor current event.

Figure 38. Shutting Down the PFC Stage by Pulling FB to GND (A) or Pulling ZCD to GND (B)

Ctrl

GND

ZCD

DRV

NCP1606

Shutdown

ZCD

OUT2

OUT1

OUT

comp

Ctrl

GND

ZCD

DRV

NCP1606

Figure 38(a)

Figure 38(b)

BOOST

To activate the shutdown feature on ZCD, the internal

clamp must first be overcome. This clamp will draw a

maximum of I

CL(NEG)

(5.0 mA maximum) before releasing

and allowing the ZCD pin voltage to drop low enough to

shutdown the part (Figure 39). After shutdown, the

comparator includes approximately 90 mV of hysteresis to

ensure noise free operation. A small current source (70 mA

typ) is also activated to pull the unit out of the shutdown

condition when the external pull down is released.

Figure 39. Shutdown Comparator and Current Draw to Overcome Negative Clamp

Shutdown

5 mA

~1 V

SDL

SDH

ZCD

CL(NEG)

~70 mA

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