UCC24636DBVT datasheet(23/35 Pages) TI1

23 / 35 page

OUT

IN(min)

OUT

VPC_EN

OUT

IN(min)

VPC_EN

R21=10k

Nominal V

, maximum power, minimum V

case

-V

×1.1 ×R21

R9=

×1.1

=5 V

=15

=65 V

=0.45 V

R9 = 179 k

VOUT

GND

RPL

COUT

VSEC

IOUT

R21

R22

R11

R23

UCC24636

VPC

DRV

GND

TBLK

VSC

VDD

UCC24636

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SLUSCG2A – MARCH 2016 – REVISED MARCH 2016

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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

For designs operating in constant current (CC) with low VOUT, there are two cases to examine. At maximum

power, VIN(MIN) will be lower but VOUT is nominal. In constant current operation, VOUT is the minimum but VIN(MIN)

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

For minimal power dissipation, select:

(8)

UCC24636DBVT Datasheet(PDF) 23 Page - Texas Instruments

UCC24636DBVT Datasheet(HTML) 23 Page - Texas Instruments

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