NCP1654BD133R2G datasheet(18/23 Pages) ONSEMI

Il numero della parte	NCP1654BD133R2G

Spiegazioni elettronici	Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters

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NCP1654

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18

Soft Start

The block diagram and timing diagram of soft start

function are as shown in Figure 42 and Figure 43. The

device provides no output (or no duty ratio) when the

Vcontrol is lower than VCONTROL(min). Vcontrol is pulled low

when:

• Brown−out, or

• Undervoltage Protection

When the IC recovers from one of the following

conditions;

Undervoltage Lockout, Brown−out or

Undervoltage Protection, the 200

mA current source block

keeps off. Hence only the Operating Trans−conductance

Amplifier (OTA) raises the Vcontrol. And Vcontrol rises

slowly. This is to obtain a slow increasing duty cycle and

hence reduce the voltage and current stress on the

MOSFET. A soft−start operation is obtained.

Figure 42. Soft Start Block Diagram

+

-

+

-

95%

VREF

OTA

Vfb

6

5

Vcontrol

Vout Low Detect

200 mA

Vdd

±20 mA

Q

S

R

Bias

Vdd

Off

UVP

UVLO

BO

UVLO

BO

95% VREF

Figure 43. Soft Start Timing Diagram

Period I

Period II

UVLO, BO, or UVP

Vdd

Vdd Rising

Vfb

Set

Reset

Q

Vout Low Detect

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