NCP1615_16 datasheet(30/46 Pages) ONSEMI

Part #	NCP1615

Description	High Voltage High Efficiency Power Factor Correction Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1615

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30

Figure 28. OTP Auto−Recovery Timing Diagram

STANDBY OPERATION

A signal proportional to the downstream converter output

power is applied to the STDBY pin to enable standby mode

operation. A STDBY voltage below the standby threshold,

Vstandby, typically 300 mV, forces the controller into a

controlled burst mode, or standby mode.

In standby mode, the driver is disabled until the bulk

voltage falls below the bulk restart level. At which point, the

driver is re−enabled. The bulk restart level determines the

minimum bulk voltage in standby mode. As long as the

STBY pin voltage is below the standby threshold, the

controller will operate in controlled burst mode.

The controller is not allowed to enter standby mode while

the PFCOK signal is low. A dedicated timer, tblank(STDBY),

blanks the standby signal for 1 ms (typically) right after the

PFCOK signal transitions high. This ensures the signal

proportional to the downstream converter output power has

enough time to build up and prevent disabling the PFC while

powering up the downstream converter. The standby circuit

block is shown in Figure 29.

Figure 29. Standby Circuit Block

t blank(STDBY)

In_Regulation

Vstandby

STDBY

Q

DRV Disable

S

R

PFC_OK

0.98*VREF

Restart

IRestart

VUVP3

UVP3

ADJUSTABLE BULK VOLTAGE HYSTERESIS

The bulk restart threshold allows the user to enable the

bulk level at which the controller exits standby mode. The

restart threshold is set at 2% below the internal reference,

VREF. The ratio between VREF and the restart level is given

by KRestart. The user can set a restart level of 2% below the

regulation level without using additional components as

shown in Figure 30. If a different restart level is desired, a

resistor network can be used as shown in Figure 31.

Figure 30. Minimum Restart Level Configuration

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NCP1615 Datasheet(PDF) 30 Page - ON Semiconductor

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