FPV1006-85-R datasheet(25/30 Pages) VICOR

25 / 30 page

Cool-Power®

Rev 1.3

vicorpower.com

Page 25 of 30

12/2015

800 927.9474

PI34xx-00

Table 4 — PI34xx-00 Inductor pairing

Device

VIN

(V)

ILOAD

(A)

CINPUT

Bulk

Elec.

CINPUT

Ceramic

X5R

COUTPUT

Ceramic

X5R

CINPUT

Ripple

Current

(IRMS)

COUTPUT

Ripple

Current

(IRMS)

Input

Ripple

(mVpp)

Output

Ripple

(mVpp)

Output

Ripple

(mVpk)

Recovery

Time

(µs)

Load

Step

(A)

(Slew/µs)

PI3420

100 µF

50 V

6 x 22 µF

8 X 100 µF

2 X 1 µF

1 X 0.1 µF

0.85

1.24

-/+41

7.5

(5 A/µs)

7.5

PI3421

100 µF

50 V

6 x 22 µF

8 X 100 µF

2 X 1 µF

1 X 0.1 µF

1.0

1.18

139

-/+50

7.5

(5 A/µs)

7.5

20.4

PI3422

100 µF

50 V

6 x 22 µF

8 X 100 µF

2 X 1 µF

1 X 0.1 µF

1.12

1.16

145

-/+46

7.5

(5 A/µs)

7.5

PI3423

100 µF

50 V

6 x 22 µF

8 X 100 µF

2 X 1 µF

1 X 0.1 µF

1.20

1.15

179

-/+73

7.5

(5 A/µs)

7.5

PI3424

100 µF

50 V

6 x 22 µF

8 X 47 µF

2 X 1 µF

1 X 0.1 µF

1.29

1.13

209

-/+98

7.5

(5 A/µs)

7.5

24.8

Table 5 — Recommended input and output capacitance

All tracking regulators should have their Enable (EN) pins

connected together to work properly.

Inductor Pairing

The PI34xx-00 utilizes an external inductor from the Eaton

Inductor line at Cooper Industries. This inductor has been

optimized for maximum efficiency performance. Table 4

details the specific inductor value and part number utilized

for each PI34xx-00 device. Datasheets are available at

www.cooperindustries.com.

Thermal Derating

Thermal de-rating curves are provided that are based on

component temperature changes versus load current, input

voltage and air flow. It is recommended to use these curves

as a guideline for proper thermal de-rating. These curves

represent the entire system and are inclusive to both the

Picor regulator and the external inductor. Maximum thermal

operation is limited by either the MOSFETs or inductor

depending upon line and load conditions.

Thermal measurements were made using a standard PI34xx-

00 Evaluation board which is 3 x 4 inches in area and uses 4-

layer, 2oz copper. Thermal measurements were made on the

three main power devices, the two internal MOSFETs and the

external inductor.

Filter Considerations

The PI34xx-00 requires input bulk storage capacitance as

well as low impedance ceramic X5R input capacitors to

ensure proper start up and high frequency decoupling for the

power stage. The PI34xx-00 will draw nearly all of the high

frequency current from the low impedance ceramic

capacitors when the main high side MOSFET is conducting.

During the time the high side MOSFET is off, they are

replenished from the bulk capacitor. If the input impedance

is high at the switching frequency of the regulator, the bulk

capacitor must supply all of the average current into the

regulator, including replenishing the ceramic capacitors. This

value has been chosen to be 100μF so that the PI34xx-00 can

start up into a full resistive load and supply the output

capacitive load with the default minimum soft start capacitor

when the input source impedance is 50 Ohms at 1MHz. The

ESR for this capacitor should be approximately 20mΩ. The

RMS ripple current in this capacitor is small, so it should not

be a concern if the input recommended ceramic capacitors

are used. Table 5 shows the recommended input and output

capacitors to be used for the various models as well as

expected transient response, RMS ripple currents per

capacitor, and input and output ripple voltages. Table 6

includes the recommended input and output

ceramic capacitors.

OUT

Master V

TRK

SGND

PI34xx

Slave

Figure 40 — Voltage divider connections for direct tracking

Device

Inductor

[nH}

Inductor

Part Number

Manufacturer

PI3420-00

FPV1006-85-R

Eaton

PI3421-00

125

FPV1006-125-R

Eaton

PI3422-00

125

FPV1006-125-R

Eaton

PI3423-00

150

FPV1006-150-R

Eaton

PI3424-00

150

FPV1006-150-R

Eaton

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