L6563_07 datasheet(25/39 Pages) STMICROELECTRONICS

Part #	L6563

Description	Advanced transition-mode PFC controller

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L6563 - L6563A

Application information

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5.

Check that the maximum current sourced by the TBO pin (pin 6) does not exceed the

maximum specified (0.25mA):

Equation 10

In the following Mathcad® sheet, as an example, the calculation is shown for the circuit

illustrated in Figure 40. Figure 41 shows the internal block diagram of the tracking boost

function.

Design data

Vin1 := 88V

Vo1:= 200V

Vin2 := 264V

Vo2:= 385V

Vox ;= 400V

∆Vo ;= 40V

Step 1

choose: Vinx: = 270V

Step 2

Step 3

I

TBOmax

3

R

T

-------

0.25 10

3

–

⋅

≤

=

Vin

clamp:

Vox

Vo

1

–

Vo

2

Vo

1

–

--------------------------- Vin

2

⋅

=

Vox

Vo

2

–

Vo

2

Vo

1

–

--------------------------- Vin

1

⋅

–

Vinclamp = 278.27V

k:

3

2Vin

x

⋅

-----------------------

=

k = 7.857 x 10-3

R1:

Vo

∆

20

----------- 10

6

⋅

=

R1 = 2 x 106

Ω

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