NCP1380 datasheet(4/26 Pages) ONSEMI

Part #	NCP1380

Description	Quasi-Resonant Current-Mode Controller for High-Power Universal Off-Line Supplies

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NCP1380

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4

INTERNAL CIRCUIT ARCHITECTURE

FB

Ct

ICt

+

−

+

−

ZCD

La ux

10 V

ESD

Vth

DRV

de ma g

S

R

Q

CS

Rsense

LEB 1

/ 4

VDD

Soft-start

VCC

aux

V CC management

latch

VDD

Rpullup

fa ul t

DRV

ga te

gr a nd

reset

gr a nd

reset

gr a nd

reset

DRV

clamp

Soft−s ta rt e nd ? the n 1

else 0

A:

l a tc he d

IpFlag

+

−

SS end

IpFlag

PWMreset

P W Mr eset

GN D

Up

Down

TIM ER

Reset

VCCstop

BO r eset

L OGI C BL OCK

VDD

Fa ul t

VCC

VOVP

IOTP(REF)

OPP

VILIMIT

VDD

VOTP

SS end

noi s e de l a y

5 ms

Ti me Out

LEB 2

+

−

VC S(stop)

CsS top

Cs S top

LEB 2 is shorter than LEB 1

40 ms

Ti me Out

SS end

The 40 ms Time Out is active

only during s oft−sta r t

SS end

Figure 3. Internal Circuit Architecture for Versions A and B

S

R

Q

Ipeak(VCO) = 17.5% VILIMIT

Ct s e tpoi nt

Ct

Discharge

3 ms blanking

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NCP1380 Datasheet(PDF) 4 Page - ON Semiconductor

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