DAP005TR datasheet(24/39 Pages) STMICROELECTRONICS

No. de pieza	DAP005TR

Descripción Electrónicos	Advanced transition-mode PFC controller

PDF	39 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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24 / 39 page

Application information

DAP005

24/39

and check that at minimum mains voltage Vin1 the peak voltage on pin 3 is greater than

0.65V.

Determine R1, the upper resistor of the output divider:

Equation 8

Calculate the lower resistor R2 of the output divider and the adjustment resistor RT:

Equation 9

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.

∆

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

⋅

2.5 R1

Vin

–

2.5

–

() Vin

2.5

–

() Vin

⋅

–

⋅

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

⋅

2kR1

Vin

–

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

⋅⋅

⋅

TBOmax

-------

0.25 10

–

⋅

≤

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