n Oscilloscope probe jack for output voltage and ripple measurements
n Simple to use
n Ring lug, screw terminal, and solder connection options
n Replaceable fuse (5 A, 216 Littelfuse recommended)
IMPORTANT NOTICE:
Please read this user guide before operating evaluation board.
Introduction
The VI Brick® AC Front End Evaluation Board oers a convenient means to evaluate
the performance of Vicor’s VI Brick AC Front End module and has been optimized for
user convenience. Refer to the table below for operating conditions and limits.
This product contains an input line filter. It is important to remember the response
of the AC line filter is dependent upon the wiring connected to the evaluation board.
Care should be exercised to minimize stray source impedances in order to fully
exercise the features of the converter.
Evaluation Board Basic Specifications and Operating Limits
Please use the following table for operating limits:
Table 1
Operating Limits
Description Specification Notes
Input Range 85 – 264 Vac Universal input
Output voltage 48 Vdc Partially Regulated, SELV
Output Power 330 W Over entire input range
Operating temperature -40 to 85°Cand Z01
Output capacitance 6,000 to 12,000μF63V rating
Note: VI Brick AC Front End Module operating temperature will depend on its Product Grade as
specified in the datasheet.
Limited by hold-up capacitor
Please refer to Figure 1 for locations of the input and output connections as viewed
from the component side. Wires may be soldered directly to the pads instead of ring
lugs if desired to minimize circuit impedances.
The VI Brick® AC Front End Evaluation Board contains exposed hazardous voltages.
These voltages are within the area marked by the hashed line on the board.
The VI Brick AC Front End Evaluation Board may be operated at surface temperatures
which may pose a thermal hazard to the operator. Because of the thermal and voltage
hazards, be careful not to touch any exposed surface unless the power is disconnected
and the evaluation board has been given sucient time to cool. The evaluation board
is not intended for use in end item equipment.
Set Up
The Customer Evaluation Board should be set up as follows:
Note: Care should be taken to avoid reversing polarities if connecting to the opposite (solder) side of
the board.
AC Input Connections (J01) DANGER! HIGH VOLTAGE!
J01, the screw terminal connector, is for connection of AC input to the AC-DC
converter evaluation board. The interconnect leads should be appropriate for the
current and voltage supplied to the board.
For single phase power, connect LINE to the pin marked L, NEUTRAL to the pin
marked N and earth ground to the pin marked EARTH. Corresponding wires in an IEC
cable are brown, blue, and yellow with a green stripe.
The board can be used with three phase power. Connect LINE1 to L and LINE2 to N.
Earth ground should still be connected to the EARTH terminal of J1.
Table 2
Output Connector Ratings
+OUT, –OUT
There are several connections available on the VI Brick AC Front End Evaluation
Board. Table 1 lists the available connectors and their current rating. Do not exceed
the rating of the connector or the module.
Connector
J02 10 A Hold-up capacitor
J03
boards
Ring Lugs 100 A General Purpose
Rating
12 A (3 A/contact)
Mating PRM and BCM eval
Recommended
Connection
Output bulk (electrolytic) capacitance must be attached across the output of the VI
Brick AC Front End Evaluation Board. It is recommended that the hold-up capacitor is
to be applied between H12 and H10 or H14 and H10. RTV adhesive should be used if
laying the capacitor on its side. Refer to table 1 from previous page for the
appropriate range of output capacitance.
The load should be connected to +OUT and –OUT terminals of the evaluation board
with short leads of suitable gauge to carry the output current and minimize losses.
A sucient number of terminal connections should be used to ensure that no
terminal sees more than its maximum rated current. The evaluation board can be
connected directly to the application for which the module is intended. However
the interconnect impedances between the evaluation board and the application
can greatly aect the transient response. For applications where transient response
is critical, the user should consider mounting the VI Brick® AC Front End module
directly to the target application PCB. Test points TP12 (–OUT) and TP07 (+OUT) can
be used to monitor the output and are located on the PCB adjacent to the output
terminals of the AC Front End module.
Earth Connections
There are several earth connections available on the board. Earth must be connected
via a low impedance connection in order for the internal line filter to function. These
earth connections also provide a safety ground for the baseplate of the module.
Earth may optionally be connected to either of the VI Brick AC Front End outputs in
order to provide a positive or negative voltage rail with respect to earth.
Output Voltage Measurement Jack (J12)
This connector is provided to make accurate measurements of the output ripple
voltage of the VI Brick AC Front End. Many types of scope probes may be directly
connected to this point if the probe is equipped with a removable plastic sheath.
To avoid creating ground loops when making measurements of the output or input
voltage, these measurements should be made separately.
A current probe can be passed around either input lead connected to the VI Brick® AC
Front End Evaluation Board. Note that an input capacitor on the evaluation board is
downstream of this measurement point.
Enable (EN)DANGER! HIGH VOLTAGE!
The EN pin can be used to disable the VI Brick AC Front End module. Connecting EN
to the IN-PFM pin will disable the module. This will also clear any latching output OVP
fault if one has occurred. Note that the EN pin is referenced to the primary (hazardous
voltage) side of the converter. Warning: The EN Pin, or the –IN PFM Pin must not be
connected to line or output of the VI Brick AC Front End.
Efficiency Measurement
As the VI Brick AC Front End module can deliver and consume large currents, the eect
of the PCB must be considered when making an eciency measurement. Be certain to
accurately measure the voltage using test points TP08 (LINE1) , TP14 (LINE2/NEUTRAL),
TP18 (–OUT), and TP01 (+OUT). Using these test points will more closely represent the
eciency of the VI Brick AC Front End module.
Hardware
The hardware kit provided with the evaluation board includes the following:
n (3) #10-32 screws n (6) #10-32 lock washer
(for +OUT, -OUT, and Earth terminals) (for +OUT, -OUT, and Earth terminals)
n (3) #10-32 hex nut n (1) 6800 uF hold-up capacitor
(for +OUT, -OUT, and Earth terminals) (can be applied between H03 and
H07, H12 and H10, or H14 and H10)
Ring lugs are also recommended for making output connections.
Thermals
For most lab environments a fan blowing across the evaluation board is recommended.
See VI Brick Thermal Management Application Note at: