L6563 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6563

Advanced transition-mode PFC controller

STMicroelectronics 

Application information

L6563 - L6563A

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

maximum specified (0.25mA):

Equation 10

ITBOmax

=

---3---

RT

≤0.25

⋅

10–3

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

illustrated in Figure 39 shows the internal block diagram of the tracking boost function.

Design data

Vin1 := 88V

Vin2 := 264V

Vox ;= 400V

∆Vo ;= 40V

Vo1:= 200V

Vo2:= 385V

Step 1

Vinclamp:

=

-V----o----x----–-----V----o---1--

Vo2 – Vo1

⋅

Vin2

–

-V----o----x----–-----V----o---2-

Vo2 – Vo1

⋅

Vin1

Vinclamp = 278.27V

choose: Vinx: = 270V

Step 2

k: = ------------3--------------

2 ⋅ Vinx

k = 7.857 x 10-3

Step 3

R1:

=

∆----V-----o-

20

⋅

106

R1 = 2 x 106 Ω

24/37

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