Vicor PFC Micro Power Factor Corrected AC-DC Switcher Manual do Utilizador descarregar pdf (Página 15)

PFC Micro Design Guide

Example:

±10% trim adjust on a 12V nominal output.

Figure 6 shows a typical variable trim circuit. Using a 10k trimpot (R7), the resistor values for R6 and R8 can be calculat-

ed as follows:

= V

ref

+ 10% = 2.75V Given: V

ref

= 2.5V (see Table 2)

= (2.75V - V

ref

)/R

= (2.75V - 2.5V)/10kΩ = 25μA Given: R

= 10kΩ (see Table 2)

Setting the bottom limit:

= 2.5V - 10% = 2.25V

And since I

= I

= 25μA,

R6 = V

= 2.25V/25μA = 90kΩ

= V

+ V

= 2.75V + 2.25V = 5V

= V

/R7 = 5V/10kΩ = 500μA

= I

+ I

= 525μA

= (V

nom

+10%) - V

= 13.2V - 5V = 8.2V Given: V

nom

= 12V

R8 = V

= 8.2V/525μA = 15.62kΩ

Consult Applications Engineering when trimming outputs below 5V.

Single Output Power Supplies (Arrays)

Westcor’s standard configuration for single output power supplies is to set the left module (as seen from looking

at the power supply output) as the controlling module of the array.

03-000048 rev A Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474 Pg. 15

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