NCP1608_10 datasheet(18/24 Pages) ONSEMI

Part #	NCP1608

Description	Critical Conduction Mode PFC Controller Utilizing a Transconductance Error Amplifier

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1608

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Figure 40. NCP1608 Supplied by a Downstream SMPS Controller (NCP1230)

1

7

6

5

2

3

4

NCP1608

+

1

7

6

5

2

3

4

NCP1230

PFC(Vcc)

88

+

D

Cbulk

VCC

+

−

Soft Start

When VCC exceeds VCC(on), tstart begins counting. When

tstart expires, the error amplifier is enabled and begins

charging the compensation network. The drive is enabled

when VControl exceeds Ct(offset). The charging of the

compensation network slowly increases the drive on time

from the minimum time (tPWM) to the steady state on time.

This creates a natural soft start mode that reduces the stress

of the power components (Figure 41).

Output Driver

The NCP1608 includes a powerful output driver capable

of sourcing 500 mA and sinking 800 mA. This enables the

controller to drive power MOSFETs efficiently for medium

power (

≤ 350 W) applications. Additionally, the driver

stage provides both passive and active pull−down circuits

(Figure 42). The pull−down circuits force the driver output

to a voltage less than the turn−on threshold voltage of a

power MOSFET when VCC(on) is not reached.

Figure 41. Startup Timing Diagram Showing the

Natural Soft Start of the Control Pin

FB

Control

Natural Soft Start

VCC(on)

VCC(off)

VCC

Iswitch

VREF

Ct(offset)

Vout

tstart

Figure 42. Output Driver Stage and Pull−Down Circuits

UVLO

DRV

GND

+

−

DRV IN

UVLO

VCC

VDD REG

VDD

VddGD

mVDD

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NCP1608 Datasheet(PDF) 18 Page - ON Semiconductor

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