HCV1707R1-R48-R datasheet(29/41 Pages) VICOR

29 / 41 page

Cool-Power® ZVS Switching Regulators

Rev 1.5

Page 29 of 41

03/2018

PI352x-00

Functional Description

The PI352x-00 is a family of highly integrated ZVS Buck

regulators. The PI352x-00 has an output voltage that can be set

within a prescribed range shown in Table 1. Performance and

maximum output current are characterized with a specific external

power inductor (see Table 3).

For basic operation, Figure 88 shows the connections

and components required. No additional design or

settings are required.

ENABLE (EN)

EN is the enable pin of the converter. The EN Pin is referenced

to SGND and permits the user to turn the regulator on or off.

The EN default polarity is a positive logic assertion. If the EN pin

is left floating or asserted high, the converter output is enabled.

Pulling EN pin below VEN_LO with respect to SGND will disable the

regulator output.

Remote Sensing

If remote sensing is required, the PI352x-00 product family

is equipped with a general purpose op-amp. This amplifier

can allow full differential remote sense by configuring it as a

differential follower and connecting the VDIFF pin to the EAIN pin.

Soft Start

The PI352x-00 includes an internal soft-start capacitor to

control the rate of rise of the output voltage. See the Electrical

Characteristics Section for the default value. Connecting an

external capacitor from the TRK pin to SGND will increase the

start-up ramp period. See, “Soft Start Adjustment and Track,” in

the Applications Description section for more details.

Output Voltage Selection

The PI352x-00 output voltage is set with REA1 and REA2 as

shown in Figure 88. Table 1 defines the allowable operational

voltage ranges for the PI352x-00 family. Refer to the Output

Voltage Set Point Application Description for details.

Output Current Limit Protection

The PI352x-00 has a current limit protection, which prevents

the output from sourcing current higher than the regulator’s

maximum rated current. If the output current exceeds the

Current Limit (IOUT_CL) for 1024µs, a slow current limit fault is

initiated and the regulator is shutdown which eliminates output

current flow. After Fault Restart Delay (tFR_DLY), a soft-start cycle

is initiated. This restart cycle will be repeated indefinitely until the

excessive load is removed.

The PI352x-00 also has short circuit protection which can

immediately stop switching to protect against catastrophic failure

of an external component such as a saturated inductor. If short

circuit protection is triggered the PI352x-00 will complete the

current cycle and stop switching. The module will attempt to soft

start after Fault Restart Delay (tFR_DLY).

Input Undervoltage Lockout

If VIN falls below the input Undervoltage Lockout (UVLO)

threshold, but remains high enough to power the internal bias

supply, the PI352x-00 will complete the current cycle and stop

switching. The system will soft start once the input voltage is

reestablished and after the Fault Restart Delay.

Figure 88 — ZVS Buck with required components

ZVS-Buck

VINVS1

VOUT

VSP

VSN

VDIFF

EAIN

EAO

COMP

TRK

PGND

VDR

SYNCO

SYNCI

PWRGD

TESTx

SGND

REA2

REA1

COMP

OUT

Table 1 — PI352x-00 family output voltage ranges

Device

Output Voltage

Nom.

Range

PI3523-00-LGIZ

3.3V

2.2 – 4.0V

PI3525-00-LGIZ

5.0V

4.0 – 6.5V

PI3526-00-LGIZ

12V

6.5 – 14V

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