NCP1608_10 datasheet(20/24 Pages) ONSEMI

Part #	NCP1608

Description	Critical Conduction Mode PFC Controller Utilizing a Transconductance Error Amplifier

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NCP1608

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3. FPP Protection: The FB pin is floating. RFB

pulls down the FB voltage below VUVP. The UVP

comparator detects an UVP fault and the drive

and error amplifier are disabled.

UVP and OVP protect the system from low bulk voltages

and rapid operating point changes respectively, while FPP

protects the system against floating feedback pin

conditions. If FPP is not implemented and a manufacturing

error causes the FB pin to float, then VFB is dependent on

the coupling within the system and the surrounding

environment. The coupled VFB may be within the

regulation limits (i.e. VUVP < VFB < VREF) and cause the

controller to deliver excessive power. The result is that Vout

increases until a component fails due to the voltage stress.

Figure 44. Open Feedback Loop Protection

FB

Control

E/A

+

−

UVP

Fault

(Enable EA)

+

−

+

−

OVP

Condition 1

Condition 2

Condition 3

Vout

Cbulk

Rout1

Rout2

CCOMP

VEAH

Clamp

RFB

VREF

VUVP

VOVP

POK

gm

VControl

Overcurrent Protection (OCP)

The dedicated CS pin of the NCP1608 senses the

inductor peak current and limits the driver on time if the

voltage of the CS pin exceeds VILIM. The maximum

inductor peak current is programmed by adjusting Rsense.

The inductor peak current is calculated using Equation 18:

IL(peak) +

VILIM

Rsense

(eq. 18)

An internal LEB filter (Figure 45) reduces the

probability of switching noise inadvertently triggering the

overcurrent limit. This filter blanks out the CS signal for a

duration of tLEB. If additional filtering is necessary, a small

RC filter is connected between Rsense and the CS pin.

Figure 45. OCP Circuitry with Optional

External RC Filter

CS

+

−

OCP

LEB

DRV

optional

Rsense

VILIM

Shutdown Mode

The NCP1608 enables the user to set the controller in a

standby mode of operation. To shutdown the controller, the

FB pin is forced to less than VUVP. When using the FB pin

for shutdown (Figure 46), the designer must ensure that no

significant leakage current exists in the shutdown circuitry.

Any leakage current affects the output voltage regulation.

Figure 46. Shutting Down the PFC Stage

1

4

3

2

8

5

6

7

NCP1608

Shutdown

Rout2

Rout1

Vout

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