FPV1006-150-R datasheet(35/41 Pages) VICOR

35 / 41 page

Cool-Power® ZVS Switching Regulators

Rev 2.5

Page 35 of 41

06/2017

PI33xx-x0

By choosing an output voltage value within the ranges stated in

Table 2, VOUT can simply be adjusted up or down by selecting the

proper Rhigh or Rlow value, respectively. The following equations

can be used to calculate Rhigh and Rlow values:

If, for example, a 4.0V output is needed, the user should choose

the regulator with a trim range covering 4.0V from Table 2. For

this example, the PI3301 is selected (3.3V set voltage). First step

would be to use Equation (1) to calculate Rhigh since the required

output voltage is higher than the regulator set voltage. The

resistor-divider network values for the PI3301 are can be found

in Table 3 and are R1 = 2.61k

Ω and R2 = 1.13kΩ. Inserting these

values in to Equation (1), Rhigh is calculated as follows:

Resistor Rhigh should be connected as shown in Figure 60 to

achieve the desired 4.0V regulator output. No external Rlow

resistor is need in this design example since the trim is above the

regulator set voltage.

The PI3311-xx output voltage can only be trimmed higher than

the factory 1V setting. The following Equation (4) can be used

calculate Rhigh values for the PI3311-xx regulators.

Soft-Start Adjust and Tracking

The TRK pin offers a means to increase the regulator’s soft-start

time or to track with additional regulators. The soft-start slope

is controlled by an internal 100nF and a fixed charge current to

provide a minimum startup time of 2ms (typical) for all PI33xx-x0

regulators. By adding an additional external capacitor to the TRK

pin, the soft-start time can be increased further. The following

equation can be used to calculate the proper capacitor for a

desired soft-start times:

Where tTRK is the soft-start time and ITRK is a 50μA internal charge

current (see Electrical Characteristics for limits).

There is typically either proportional or direct tracking

implemented within a design. For proportional tracking between

several regulators at startup, simply connect all devices TRK

pins together. This type of tracking will force all connected

regulators to startup and reach regulation at the same time

(see Figure 61(a)).

For Direct Tracking, choose the regulator with the highest output

voltage as the master and connect the master to the TRK pin of

the other regulators through a divider (Figure 62) with the same

ratio as the slave’s feedback divider (see Table 3 for values).

All connected regulators’ soft-start slopes will track with this

method. Direct tracking timing is demonstrated in Figure 61(b). All

tracking regulators should have their Enable (EN) pins connected

together to work properly.

Table 3 — PI33xx-x0 Internal divider values

high

(

)

OUT – 11

–

( )

(1)

low

(

)

OUT – 1

–

( )

(2)

3.78k

(

)

4.0 – 1

1.13k

–

( )

2.61k

(3)

TRK =

(5)

TRK • ITRK

– 100 • 10 -9

()

OUT 1

OUT 2

Master V

OUT

OUT 2

(a)

(b)

Figure 61 — PI33xx-x0 tracking methods

Master V

OUT

SGND

TRK

PI33xx

Slave

Figure 62 — Voltage divider connections for direct tracking

Device

PI3311-x0-LGIZ

Open

100

PI3318-x0-LGIZ

0.806k

1.0k

100

PI3312-x0-LGIZ

1.5k

1.0k

100

PI3301-x0-LGIZ

2.61k

1.13k

100

PI3302-x0-LGIZ

4.53k

1.13k

100

PI3303-x0-LGIZ

11.0k

1.0k

100

PI3305-x0-LGIZ

14.0k

1.0k

100

high (1V)

(

)

OUT – 1

(4)

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