OUT

IN

IN(min)

OUT

VPC_EN

PS

VPC_EN

OUT

PS

IN(min)

VPC_EN

R21=10k

Nominal V

, maximum power, minimum V

case

V

+V

-V

×1.1 ×R21

N

R9=

V

×1.1

V

=5 V

N

=15

V

=65 V

V

=0.45 V

R9 = 179 k

ª

º

§

·

«

»

¨

¸

¨

¸

«

»

©

¹

¬

¼

Ns

GND

R9

R21

R22

R11

R23

UCC24636

VPC

DRV

GND

TBLK

VSC

VDD

23

UCC24636

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SLUSCG2A – MARCH 2016 – REVISED MARCH 2016

Product Folder Links: UCC24636

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Copyright © 2016, Texas Instruments Incorporated

9.2.3 Calculation of Component Values

Figure 19. UCC24636 Circuit Design

For ease of understanding, Figure 19 is a modified version of Figure 15 where the component reference

designators are the same as the schematic drawing of Figure 18.

9.2.3.1 VPC Input

will be higher. Determine R9 for both conditions, and choose the lowest value.

For minimal power dissipation, select:

(8)