EPC 9115 Quick Start Manual - Page 4

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EPC 9115 Quick Start Manual
QUICK START GUIDE

OPERATING CONSIDERATIONS

The EPC9115 is a demonstration platform intended to show the
capabilities of eGaN FETs in an eighth-brick application. The converter has
basic regulation and overcurrent protection, but the complete feature set
often found with 1/8th-brick converters is not implemented. In particular,
the EPC9115 does not have overvoltage, over-temperature, or fast-acting
short-circuit protection. Hence, the circuit is recommended for power
stage and efficiency evaluation purposes. The transient response has not
been optimized.
SOURCE and LOAD: It is recommended that the converter be driven from a
source with both low ac and dc impedance. Additional input capacitance
may be added as necessary. Additional output capacitance may be added
to the output in the form of electrolytic capacitors, up to 1000 μF. Addition
of bulk capacitance in the form of low ESR capacitors is not recommended.
THERMAL MANAGEMENT: The EPC9115 demo board has no on-board
thermal protection. Thermal images for steady state full load operation
are shown in Figure 6. The EPC9115 is intended for bench evaluation with
nominal room ambient temperature and forced air cooling.
Operation without forced air cooling is possible for limited power
operation. It is recommended that the maximum temperature on the
EPC9115 not exceed 125 °C.
ELECTRICAL PROTECTION: Overcurrent protection is set at a nominal
value of 50 A at room temperature. Current sensing is implemented using
inductor DCR sensing, and as a result exhibits variability as a function of
the inductor and its temperature. As the inductor becomes hotter, the trip
point becomes lower.
The EPC9115 demo board does not have any input overvoltage protection
on board. It is also recommended to make sure that the converter is started
with an output voltage of 1V or less.
Figure 6: Thermal images of EPC9115. Operating conditions: 400 LFM (2 m/s) forced convection, ambient temperature 27 °C, thermal steady state.
EPC – EFFICIENT POWER CONVERSION CORPORATION |
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96
95
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90
0
Figure 5: Typical efficiency curves. Operating conditions: 400 LFM (2 m/s) forced convection, ambient
temperature 27 °C, thermal steady state. The converter is running unregulated for the 48 V case.
400 LFM
WWW.EPC-CO.COM
| COPYRIGHT 2015 |
10
20
30
I
(A)
OUT
EPC9115
V
= 60
IN
V
= 56
IN
V
= 52
IN
V
= 48
IN
40
50
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