SiC641, SiC641A

www.vishay.com

Vishay Siliconix

S19-0864-Rev. A, 21-Oct-2019

8

Document Number: 77191

For technical questions, contact: powerictechsupport@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

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PWM TIMING DIAGRAM

Fig. 4 - Definition of PWM Logic and Tri-state

ZCD_EN# - PS4 EXIT TIMING

Fig. 5 - ZCD_EN# - PS4 Exit Timing

DEVICE TRUTH TABLE

DSBL#

ZCD_EN#

PWM

GH

GL

LX

X

L

L

H

Tri-state

X

L

L

H

LLL

H, IL > 0 A

L, IL < 0 A

HL

H

H

L

HL

Tri-state

L

L

HH

L

L

H

H

HHH

L

HH

Tri-state

L

L

VTH_PWM_R

VTH_PWM_F

VTH_TRI_R

VTH_TRI_F

PWM

GH

GL

t PD_OFF_GL

t TSHO

t PD_ON_GH

t PD_OFF_GH

t PD_ON_GL

t TSHO

t PD_TRI_R

t PD_TRI_R

PWM

V

SWH

ZCD_EN#

t

PS4EXIT

5 V

5 V

2.5 V