EVAL-1000001

EVAL-1000001
Evaluation Board for Isolated Converters
Half, Quarter, Eighth, and Sixteenth Brick
Advancing the
Power Curve
Summary
®
SynQor has developed EVAL-1000001, an evaluation board
to facilitate testing of our lower power isolated half-brick,
quarter-brick, eighth-brick, and sixteenth-brick DC-DC
converters rated to 100 V or less.
Introduction
This application note is a guide to the features, schematic, component placement, and BOM for this evaluation
board. The applicable series of DC-DC converter modules include the following modules rated to less than 300 W
with an input rated to 100 V or less: MCOTS-C-28/28V/28VE, MCOTS-C-48, PowerQor (PQ), InQor (IQ), RailQor
(RQ), BusQor (BQ), Semi-Regulated BusQor (SQ) and CFQor (CF). For higher power modules with an input rated
to 100 V or less see EVAL-1000008. For higher power modules with an input rated for high voltage see EVAL1000005.
For assistance with testing the performance of our DC-DC power converters, please refer to our application note
“Guidelines for Testing SynQor DC-DC Converters”.
Contents
Section
Section
Section
Section
Section
1
2
3
4
5
–
–
–
–
–
Input and Output Connections
Switches, Trim Resistors, and BNC Connectors
Schematic
Component Placement
Bill of Materials (BOM)
Shock Warning: There are areas of this evaluation board that have exposed access to high voltage. Exercise
caution to avoid contact with those voltages. This evaluation board may retain high voltage temporarily after input
power has been removed. Exercise caution when handling.
Application of Input Power: Never apply input power to a converter with a switch closure, such as a knife switch
or circuit breaker. That type of action applies input voltage with an uncontrolled very high rate of rise (dV/dt) that
could be damaging to the converter and to external components before the converter. Instead, apply input voltage
with a controlled rate of rise. Also, ensure input voltage is off before inserting or removing a converter module from
the evaluation board.
Thermal Considerations: When testing converters on an evaluation board, ensure adequate cooling. Apply
cooling air with a fan blowing across the converter or across a heatsink attached to the converter. Monitor the
converter temperature to ensure it doesn’t exceed the maximum rated per the datasheet specification.
Sockets: This evaluation board uses sockets to provide the option of testing multiple converters. These sockets
are not rated for continuous high currents. Short-term testing is fine, but be aware of this limitation for longerterm testing. The spring fingers in the sockets will add resistance in the power path, which will cause voltage
drops at higher currents that could contribute significant errors in regulation and efficiency measurements. These
spring fingers also do not provide the thermal cooling path from the module pins to PCB routing that is enabled by
soldered connections. This may contribute to higher converter temperatures and error when performing thermal
evaluations. For longer-term testing, thermal testing, and permanent installations use soldered connections.
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Advancing the Power Curve Advancing the
Power Curve
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Application Note
EVAL-1000001
Section 1 – Input and Output Connections
Input power is applied through connector “IN”. Output power is applied through connector “OUT”.
Control signals are applied through connectors “IN” and “OUT”.
See Table 1 and 2 for connector signal descriptions.
Table 1: Connector “IN”
Terminal #
Signal Name
1
Vin(+)
2
Vin(+)
3
Vin(+)
4
Vcap
5
On/Off
6
F_Syn
7
Start_S
8
Ishare
9
Vin(-)
10
Vin(-)
11
Vin(-)
Terminal #
Signal Name
1
Vout(+)
2
Vout(+)
3
Vout(+)
4
Vout(+)
5
Sense(+)
Table 2: Connector “OUT”
6
Trim
7
Sense(-)
8
Vout(-)
9
Vout(-)
10
Vout(-)
11
Vout(-)
Note: Please refer to the appropriate SynQor converter datasheet for descriptions of these features.
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Advancing the Power Curve Advancing the
Power Curve
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Application Note
EVAL-1000001
Section 2 – Switches, Trim Resistors, and BNC Connectors
Description of Switches
Enable On/Off Switch
Toggling this switch to the ON (-N) position enables “N” type negative on/off logic converters. Toggling this
switch to the ON (-P) position enables “P” type positive on/off logic converters. The enable signal is connected
to the input connector “IN” for remote access.
Output Voltage Trim Switch
Toggling this switch to the “Up” or “Down” position connects the converter trim pin to Sense(+) or Sense(-) pin
through the trim resistors, R1-R4. This allows for trimming the output voltage up or down by adjusting the trim
resistors. Leaving the switch in the middle position will disable the output voltage trim function.
Description of Trim Resistors
Voltage Trim
Fixed resistor R1 and potentiometer R2 are used to adjust down the output voltage set-point of the non-isolated converter.
Fixed resistor R4 and potentiometer R3 are used to adjust up the output voltage set-point of the non-isolated
converter.
The trim resistors R1 through R4 are not populated in this evaluation board. This is to allow the user to determine and install the needed trim resistance values based on the range of desired output voltage adjustment of
the module being evaluated.
BNC Monitoring Point Descriptions
VIN – Converter Input Voltage
VOUT – Converter Output Voltage
VL – Output ripple voltage measurement point. Use this BNC with AC coupling on the oscilloscope.
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Power Curve
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Application Note
EVAL-1000001
Section 3 – Schematic
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EVAL-1000001
Section 4 – Component Placement
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Application Note
EVAL-1000001
Section 5 – Bill of Materials (BOM)
Table 3: EVAL-1000001
Ref Des
Value
Tolerance
Package
C1
1 uF
10 %
1812
C2
100 uF
20 %
C3
OPEN
C4
1 uF
C5
OPEN
C6
OPEN
C7
1 uF
C8
D1
Description
Cap, ceramic, X7R, 100V
Cap, alum. elec., 100 V, Nichicon UPR2A101MHH
D case
10 %
1812
Capacitor
Cap, ceramic, X7R, 100V
D case
Capacitor
D case
Capacitor
10 %
1812
Cap, ceramic, X7R, 100V
OPEN
1812
Capacitor
120 V
DO41
TVS, axial
F1
3AG
Fuse, Littelfuse 345 series
L1
10 uH
R1
1K
R2
OPEN
Resistor, Trim Potentiometer, 3299Y-1-xxx LF (xxx = value)
R3
OPEN
Resistor, Trim Potentiometer, 3299Y-1-xxx LF (xxx = value)
R4
1K
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Inductor, SMT
Resistor
Resistor
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Advancing the Power Curve Advancing the
Power Curve
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