SiC521, SiC521A

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Vishay Siliconix

S15-0170-Rev. B, 09-Feb-15

6

Document Number: 62989

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

FUNCTIONAL BLOCK DIAGRAM

Fig. 3 - SiC521 and SiC521A Functional Block Diagram

PWM TIMING DIAGRAM

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

DEVICE TRUTH TABLE

ZCD_EN#

PWM

GH

GL

LL

L

LH

HL

L

Tri-state

L

L

HL

LH

HH

H

L

H

Tri-state

L

L

PWM

V

CIN

20K

BOOT

Anti-cross

conduction

control

logic

PWM logic

control &

state

machine

UVLO

ZCD_EN#

PHASE

V

CIN

P

GND

GL

SW

PWM

GH

GL