FPV1006-150-R datasheet(34/41 Pages) VICOR

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Cool-Power® ZVS Switching Regulators

Rev 2.5

Page 34 of 41

06/2017

PI33xx-x0

The PI33xx-x0 default for SYNCI is to sync with respect to the

falling edge of the applied clock providing 180° phase shift from

SYNCO. This allows for the paralleling of two PI33xx-x0 devices

without the need for further user programming or external

sync clock circuitry. The user can change the SYNCI polarity to

sync with the external clock rising edge via the I2C™ data bus

(PI33xx-20 device versions only).

By connecting the EAO pins and SGND pins of each module

together the units will share the current equally. When the TRK

pins of each unit are connected together, the units will track each

other during soft-start and all unit EN pins have to be released to

allow the units to start (See Figure 59). Also, any fault event in any

regulator will disable the other regulators. The two regulators will

be out of phase with each other reducing output ripple (refer to

Switching Frequency Synchronization).

To provide synchronization between regulators over the entire

operational frequency range, the Power Good (PWRGD) pin must

be connected to the lead regulator’s (#1) SYNCI pin and a

2.5k

Ω Resistor, R1, must be placed between SYNCO (#2) return

and the lead regulator’s SYNCI (#1) pin, as shown in Figure 59.

In this configuration, at system soft-start, the PWRGD pin pulls

SYNCI low forcing the lead regulator to initialize the open-loop

startup synchronization. Once the regulators reach regulation,

SYNCI is released and the system is now synchronized in a closed-

loop configuration which allows the system to adjust, on the

fly, when any of the individual regulators begin to enter variable

frequency mode in the loop.

Multi-phasing three regulators is possible (PI33xx-20 only) with

no change to the basic single-phase design. For more information

about how to program phase delays within the regulator, please

refer to Picor application note PI33xx-2x Multi-Phase

Design Guide.

I2C™ Interface Operation

PI33xx-20 devices provide an I2C digital interface that enables the

user to program the EN pin polarity (from high to low assertion)

and switching frequency synchronization phase/delay. These are

one time programmable options to the device.

Also, the PI33xx-20 devices allow for dynamic VOUT margining via

I2C that is useful during development (settings stored in volatile

memory only and not retained by the device). The PI33xx-20 also

have the option for fault telemetry including:

■

Fast/Slow current limit

■

Output voltage high

■

Input overvoltage

■

Input undervoltage

■

Over temperature protection

For more information about how to utilize the I2C interface please

refer to Picor application note PI33xx-2x I2C Digital

Interface Guide.

Application Description

Output Voltage Trim

The PI33xx-x0 family of Buck Regulators provides seven common

output voltages: 1.0V, 1.8V, 2.5V, 3.3V, 5.0V, 12V and 15V. A

post-package trim step is implemented to offset any resistor

divider network errors ensuring maximum output accuracy. With

a single resistor connected from the ADJ pin to SGND or REM,

each device’s output can be varied above or below the nominal

set voltage (with the exception of the PI3311-X0 which can only

be above the set voltage of 1V).

The remote pin (REM) should always be connected to the VOUT

pin, if not used, to prevent an output voltage offset. Figure 60

shows the internal feedback voltage divider network.

R1, R2, and R4 are all internal 1.0% resistors and Rlow and Rhigh

are external resistors for which the designer can add to modify

VOUT to a desired output. The internal resistor value for each

regulator is listed below in Table 3.

Table 2 — PI33xx-x0 family output voltage range

ADJ

REM

OUT

SGND

low

high

1.0V

Figure 60 — Internal resistor divider network

Device

Output Voltage

Set

Range

PI3311-x0

1.0V

1.0 to 1.4V

PI3318-x0

1.8V

1.4 to 2.0V

PI3312-x0

2.5V

2.0 to 3.1V

PI3301-x0

3.3V

2.3 to 4.1V

PI3302-x0

5.0V

3.3 to 6.5V

PI3303-x0

12V

6.5 to 13.0V

PI3305-x0

15V

10.0 to 16.0V

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