VICOR PI33xx-xx-EVAL1 ZVS Regulators Buck Evaluation Board User Guide

USER GUIDE | UG:302
PI33xx-xx-EVAL1 & PI34xx-xx-EVAL1
ZVS Regulators Buck Evaluation Board

Introduction

The PI33xx-xx-EVAL1 and PI34xx-xx-EVAL1 evaluation board demonstrates the features and benefits of the ZVS Buck Regulator PI33xx and PI34xx families. The board features the ZVS Buck Regulator SiP, along with inductor, ceramic input and output capacitors.

The evaluation board provides several options for making input power (V IN and GND) and output load (V OUT and GND) connections. The user can solder tab style banana jacks or wire, use threaded binding posts secured by a retaining nut, or to simply use a #6 nut and bolt connection.
All the I/O pins are labeled and routed to the board edge for easy access. Each I/O pin is accompanied with an adjacent 50mil through-hole for adding a test point or to facilitate wiring to external circuitry.

The board has a scope tip jack for measuring output voltage (V OUT), and has locations for two optional jacks for measuring V IN and the switching node of the regulator (See Figure 4). There are two headers installed: an ENABLE jumper which can be used to enable or disable the converter and the remote sense jumper that will connect the buck’s remote sense pin to the output at the V OUT terminal.

Connections required for parallel regulator operation are grouped together (labeled Current Sharing) to allow for easy connection between evaluation boards. There is a zero ohm jumper between SYNCI and SGND to ensure that SYNCI is grounded when not used. This resistor must be removed for interleaved operation. Please refer to the product data sheet for more detailed information on paralleling and on interleaving units.

There are two unpopulated resistor footprints (RADJ1 and RADJ2) used in trimming the output voltage and a capacitor footprint (CTRK) to add additional capacitance to the output tracking pin. Please refer to the product datasheet for more detailed information on these topics.
The evaluation board is constructed using 4 layers of 2oz copper and is routed to optimize the regulation path between input and output voltage, which reduces the parasitic losses and yields the best efficiency.

Table 1
Applicable evaluation board, product part numbers, and associated evaluation PCB number

Figure 1
Evaluation board (PCB 0108)

Figure 2
Evaluation board (PCB 0113)

Figure 3
Evaluation board (PCB 0190)

Evaluation Board Supply & Load Connections

Figure 4 displays the recommended connections for input supply and output loading, and the best test points for measuring input and output voltages. All the I/O pins are brought out to the edge to allow for easy measurement and/or connection to the user’s external circuitry.

Figure 4
Evaluation board measurement connection

Bills of Materials

Locate the PCB number for your product in the following tables and find the BOM for that PCB.

Table 2
Bill of materials Vicor ZVS Buck Regulator evaluation board (PCB 0108)

Device| Qty| Designators| Value| Description| Manufacturer| Part Number
---|---|---|---|---|---|---
PI3301-00| 1| U1| 3.3V ZVS
Buck Regulator| ZVS Buck Regulator| VICOR| PI3301-00-LGIZ
4| C10-C13| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 200nH| Buck Inductor| Eaton| FPT705-200-R
| I2C INTERFACE| n/a| n/a| n/a| n/a
PI3302-00| 1| U1| 5V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3302-00-LGIZ
4| C10-C13| 47µF 10V| Ceramic Output Capacitor| Murata| GRM31CR61A476ME15L
1| L1| 200nH| Buck Inductor| Eaton| FPT705-200-R
| I2C INTERFACE| n/a| n/a| n/a| n/a
PI3303-00| 1| U1| 12V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3303-00-LGIZ
4| C10-C13| 22µF 25V| Ceramic Output Capacitor| Murata| GRM31CR61E226KE15L
1| L1| 230nH| Buck Inductor| Eaton| FPT705-200-R
| I2C INTERFACE| n/a| n/a| n/a| n/a
PI3303-20 [a]| 1| U1| 12V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3303-20-LGIZ
4| C10-C13| 22µF 25V| Ceramic Output Capacitor| Murata| GRM31CR61E226KE15L
1| L1| 230nH| Buck Inductor| Eaton- Coiltronics| FPT705-230-R
1| I2C INTERFACE| | 4 Position, I2C Header| Molex| 22-23-2041
PI3305-00| 1| U1| 15V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3305-00-LGIZ
4| C10-C13| 22µF 25V| Ceramic Output Capacitor| Murata| GRM31CR61E226KE15L
1| L1| 230nH| Buck Inductor| Eaton- Coiltronics| FPT705-230-R
| I2C INTERFACE| n/a| n/a| n/a| n/a
PI3312-00 [a]| 1| U1| 2.5V ZVS
Buck Regulator| ZVS Buck Regulator| VICOR| PI3312-00-LGIZ
---|---|---|---|---|---|---
4| C10-C13| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 200nH| Buck Inductor| Eaton- Coiltronics| FPT705-200-R
| I2C INTERFACE| n/a| n/a| n/a| n/a
Common| 10| ADJ, ADR0, ADR1, EAO, EN, REM, SGND, SYNCI, SYNCO, TRK| | SM Test Point| Keystone| 5015
4| C1-C4| 4.7µF 50V| Ceramic Capacitor| Murata| GRM31CR71H475KA12L
4| C5-C8| 0.1µF 50V| Ceramic Capacitor| TDK| C2012X7R1H104K085AA
1| C14| 0.1µF 50V| Ceramic Capacitor| Murata| GRM319R71H104KA01D
2| C15-C16| 1µF 16V| Ceramic Capacitor| Murata| GRM188R71C105KA12J
2| ENABLE, H1| | Header Jumper| Samtec| TSW-148-07-F-S
3| GND, VIN, VOUT| | TH Testpoint| Vector| K24
1| JJVOUT| | Compact 3.5mm Jack| Tektronix| 131503100
| JJVIN, JJVSW| n/a| n/a| n/a| n/a
1| PCB| | PI33xx-xx- EVAL1 PCB| VICOR| PCB0108
1| RSYNC| 0Ω| 0805 Resistor| Rohm| MCR10EZPJ000
[a] End-of-life part number.

Table 3
Bill of materials Vicor ZVS Buck Regulator evaluation board (PCB 0113)

Device| Qty| Designators| Value| Description| Manufacturer| Part Number
---|---|---|---|---|---|---
PI3301-01| 1| U1| 3.3V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3301-01-LGIZ
8| C10-C15 C19-C20| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 150nH| Buck Inductor| Datatronics| 38950-05
6| C1-C6| 4.7µF 50V| Ceramic Capacitor| Murata| GRM31CR71H475KA12L
PI3311-00 [a]| 1| U1| 1V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3311-00-LGIZ
8| C10-C15 C19-C20| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 125nH| Buck Inductor| Datatronics| 38950-04
6| C1-C6| 4.7µF 50V| Ceramic Capacitor| Murata| GRM31CR71H475KA12L
PI3311-01 [a]| 1| U1| 1V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3311-01-LGIZ
8| C10-C15 C19-C20| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 80nH| Buck Inductor| Datatronics| 38950-02
6| C1-C6| 4.7µF 50V| Ceramic Capacitor| Murata| GRM31CR71H475KA12L
PI3312-01 [a]| 1| U1| 2.5V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3312-01-LGIZ
8| C10-C15 C19-C20| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 125nH| Buck Inductor| Datatronics| 38950-04
6| C1-C6| 4.7µF 50V| Ceramic Capacitor| Murata| GRM31CR71H475KA12L
PI3318-00 [a]| 1| U1| 1.8V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3318-00-LGIZ
8| C10-C15 C19-C20| 100µF 6.3V| Ceramic Output Capacitor| Murata| GRM31CR60J107ME39L
1| L1| 150nH| Buck Inductor| Datatronics| 38950-05
6| C1-C6| 4.7µF 50V| Ceramic Capacitor| Murata| GRM31CR71H475KA12L
Device| Qty| Designators| Value| Description| Manufacturer| Part Number
---|---|---|---|---|---|---
PI3424-00| 1| U1| 5V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3424-00-LGIZ
8| C10-C15 C19-C20| 47µF 10V| Ceramic Output Capacitor| Murata| GRM31CR61A476ME15L
1| L1| 150nH| Inductor| Datatronics| 38950-05
6| C1-C6| 22µF 25V| Ceramic Capacitor| Murata| GRM31CR61E226KE15L
Common| 11| ADJ, ADR0, ADR1, EAO, EN, NC, REM, SGND, SYNCI, SYNCO, TRK| | SM Testpoint| Keynote| 5015
2| C7-C8| 0.1µF 50V| Ceramic Capacitor| TDK| C2012X7R1H104K085AA
1| C16| 0.1µF 50V| Ceramic Capacitor| Murata| GRM319R71H104KA01D
2| C17-C18| 1µF 16V| Ceramic Capacitor| Murata| GRM188R71C105KA12J
2| ENABLE, H1| | Header Jumper| Samtec| TSW-148-07-F-S
3| GND, VIN, VOUT| | TH Testpoint| Vector Technologies| K24C/M
1| JJVOUT| | Compact 3.5mm Jack| Tektronix| 131503100
| JJVIN, JJVSW| n/a| n/a| n/a| n/a
1| PCB| | PI3xxx-xx- EVAL1-pcb| VICOR| PCB0113
1| ROUT| 1kΩ| Resistor| Rohm| MCR18EZHF1001
1| RSYNC| 0Ω| Resistor| Rohm| MCR10EZPJ000
| I2C_ INTERFACE| n/a| n/a| n/a| n/a
[a] End-of-life part number.

Table 4
Bill of materials Vicor ZVS Buck Regulator evaluation board (PCB 0190)

Device| Qty| Designators| Value| Description| Manufacturer| Part Number
---|---|---|---|---|---|---
PI3302-03| 1| U1| 5V ZVS Buck Regulator| ZVS Buck Regulator| VICOR| PI3302-03-LGIZ
6| C10-C15| 47µF 10V| Ceramic Capacitor| Murata| GRM32ER71A476KE15L
1| L1| 185nH| Buck inductor| Eaton- Coiltronics| FP1507R1-R185-R
11| ADJ, ADR0, ADR1, EAO, EN, N/C, REM, SGND, SYNCI, SYNCO, TRK| | SM Testpoint| Keystone| 5015
1| C16| 0.1µF 50V| Ceramic Capacitor| Murata| GRM319R71H104KA01D
2| C17-C18| 1µF 16V| Ceramic Capacitor| Murata| GRM188R71C105KA12J
6| C1-C6| 10µF 50V| Ceramic Capacitor| TDK| C3216X5R1H106K160AB
2| C7-C8| 0.1µF 50V| Ceramic Capacitor| TDK| C2012X7R1H104K085AA
2| ENABLE, H1| | Header Jumper| Samtec| TSW-148-07-F-S
| JJVIN, JJVSW, JJVOUT| n/a| n/a| n/a| n/a
3| GND, VIN VOUT| | TH Testpoint| Vector| K24
1| ROUT| 1kΩ| 1206 Resistor| Rohm| MCR18EZHF1001
1| RSYNC| 0Ω| 0805 Resistor| Rohm| MCR10EZPJ000
| I2C_ INTERFACE| n/a| n/a| n/a| n/a

Evaluation Board Notes

The evaluation board has solder mask openings on the bottom side of the board to allow for the option of additional output capacitance (4 x 1206 or 2 x 1812).
There are two additional, unmarked, scope tip test points (circled in red in Figures 8 – 10) that allow the user to measure V IN and the switching node (VS1). These are labeled as JJVIN and JJVSW in Figures 8 – 10.
There are two through-hole pads (blue circle) for the addition of an electrolytic bulk storage capacitor.
This capacitor is required when the evaluation board is connected to the input voltage source through long leads. A 100µF, 50V Electrolytic is recommended with an ESR between 20 and 50mΩ.
The two pins labeled as “N/C” (highlighted in green box in Figures 8 – 10) are not electrically connected to each other.
There are internal connections within the PI33xx and PI34xx between grounds SGND and PGND.
It is not required to tie these two grounds together externally and these two grounds are not connected together on the evaluation board.

Figure 8
Optional Test Points & Component Locations (PCB 0108)

Figure 9
Optional Test Points & Component Locations (P CB0113)

Figure 10
Optional Test Points & Component Locations (PCB0190)

Figure 11
Board Dimensions Common to all Three PCBNumbers

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