HCV1707R1-R48-R datasheet(35/41 Pages) VICOR

35 / 41 page

Cool-Power® ZVS Switching Regulators

Rev 1.5

Page 35 of 41

03/2018

PI352x-00

Inductor Pairing

The PI352x-00 utilizes an external inductor. This inductor has

been optimized for maximum efficiency performance. Table 3

details the specific inductor value and part number utilized for

each PI352x-00.

The same inductor model may have different effective thermal

impedances, depending on the model ZVS Buck paired with

it. The thermal impedances are used in a virtual model of the

inductor to estimate the maximum temperature, and the location

of the maximum temperature may vary depending on the

ZVS Buck model that the inductor is used with. This is because the

effective thermal impedances are not only based on the geometry

and materials used in the inductor, but include how the inductor

power dissipation is distributed among core losses, DC copper

losses, and AC copper losses. This distribution is dependent on

the ZVS buck model that uses the inductor.

Parallel Operation

Multiple PI352x-00 can be connected in parallel to increase

the output capability of a single output rail. When connecting

modules in parallel, each EAO, TRK, and EN pin should be

connected together. EAIN pins should remain separated, each

with an REA1 and REA2, to reject noise differences between

different modules' SGND pins. Current sharing will occur

automatically in this manner so long as each inductor is the same

value. Refer to the Electrical Characteristics table for maximum

array size and array rated output current. Current sharing may be

considered independent of synchronization and/or interleaving.

Modules do not have to be interleaved or synchronized

to share current.

Due to the high output current capability of a single module and

Critical Conduction Mode (CrCM) occurring at approximately

50% rated load, interleaving is not supported.

Use of the PI352x-00 SYNCI pin is practical only under a limited

set of conditions. Synchronizing to another converter or to a fixed

external clock source can result in a significant reduction in output

power capability or higher than expected ripple.

Filter Considerations

The PI352x-00 requires low impedance ceramic input capacitors

(X7R/X5R or equivalent) to ensure proper start up and high

frequency decoupling for the power stage. The PI352x-00

will draw nearly all of the high frequency current from the

low impedance ceramic capacitors when the main high side

MOSFET(s) are conducting. During the time the MOSFET(s) are off,

the input capacitors are replenished from the source.

Table 6 shows the recommended input and output capacitors

to be used for the PI352x-00 as well as per capacitor RMS ripple

current and the input and output ripple voltages. Table 5 lists the

recommended input and output ceramic capacitors manufacturer

and part numbers. It is very important to verify that the voltage

supply source as well as the interconnecting lines are stable and

do not oscillate.

Input Filter Case 1 — Inductive source and local, external,

input decoupling capacitance with negligible ESR

(i.e., ceramic type):

The voltage source impedance can be modeled as a series

Rline Lline circuit. The high performance ceramic decoupling

capacitors will not significantly damp the network because

of their low ESR; therefore in order to guarantee stability the

following conditions must be verified:

Where rEQ_IN can be calculated by dividing the lowest line voltage

by the full load input current. It is critical that the line source

impedance be at least an octave lower than the converter’s

dynamic input resistance, Equation 6. However, Rline cannot

be made arbitrarily low otherwise Equation 5 is violated and

the system will show instability, due to an under-damped

RLC input network.

Figure 96 — PI352x-00 parallel operation

ZVS-Buck

VINVS1

VOUT

VSP

VSN

VDIFF

EAIN

EAO

COMP

TRK

PGND

VDR

SYNCO

SYNCI

PWRGD

TESTx

SGND

CIN_1

COUT_1

REA2_1

L1_1

REA1_1

CCOMP_1

VIN

ZVS-Buck

VINVS1

VOUT

VSP

VSN

VDIFF

EAIN

EAO

COMP

TRK

PGND

VDR

SYNCO

SYNCI

PWRGD

TESTx

SGND

CIN_2

COUT_2

L1_2

CCOMP_2

VIN

VOUT

TRK

EAO

TRK

EAO

REA2_2

REA1_2

(

)

line

IN_INT + CIN_EXT

• r

EQ_IN

line >

(5)

(6)

line << rEQ_IN

Table 4 — PI352x-00 Inductor pairing

Product

System

Value

(nH)

MFR

Part Number

Max Operating

Temp (°C)

PI3523

230

Eaton

FP2207R1-R230-R

125

PI3525

230

Eaton

FP2207R1-R230-R

125

PI3526

480

Eaton

HCV1707R1-R48-R

125

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