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SCS112AGC Datasheet(PDF) 6 Page - Rohm

Part # SCS112AGC
Description  Silicon Carbide Schottky Barrier Diodes
Download  11 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

SCS112AGC Datasheet(HTML) 6 Page - Rohm

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both minimum power factor and efficiency levels.
n
In 2004, the 80 Plus program was launched that
requires 80% or higher energy efficiency at various
loads (see Table 2). SiC SBDs allow power supply
designers to meet high efficiency certification lev-
els such as 80 Plus Bronze, Silver, or Gold.
n
In July 2009, the U.S. Department of Energy
(DOE) ENERGY STAR v5.0 specification for com-
puters that includes 80 Plus power supply effi-
ciency was adopted by the European Commission
and the U.S. government.
SiC advantages in real-world applications
SMPSs with output power ratings above 300 W typically
use active PFC boost converters designed to operate
in continuous conduction mode (CCM). The single big-
gest advantage of using SiC diode in place of Si diode is
the former’s much lower reverse recovery current (See
Figure 1), which translates into approximately 60% lower
switching loss and elimination (or great simplication) of
the snubber circuit to control EMI. Also, the switching
transistor no longer has to be derated to accommodate
the large reverse current from the silicon blocking diode
— a lower amperage, less expensive transistor can be
used. With lower loss, the heat sink/cooling system can
be made smaller. Lower switching loss allows the circuit
to operate at higher frequency giving designers options
to further increase efficiency and/or to reduce the
choke’s size, saving cost and board space.
As a practical example, consider the PFC circuit
in a 1 KW AC-DC power supply with the following
characteristics:
n
Input: 100 Vac, 60 Hz
n
Output: 400 Vdc, 2.5 A
n
Switching frequency: 50 KHz
n
Operating temperature: 100º C
Tabel 3 summarizes the performace comparison
between a circuit using a 600V Si FRD and an SiC SBD.
Improvements similar to those in power supplies and
PFC circuits can be obtained in other applications. For
example, inverters with SiC SBDs have dramatically
reduced recovery losses, resulting in improved efficiency.
When used with IGBTs and lower operating frequencies,
the lower thermal losses allow for smaller heat sinks.
Using ROHM’s SiC SBDs, customers report improve-
ments of system-level efficiency from 0.3% to 1.0%.
This translates into an annual savings of over $50 for
a 20 kW inverter operating at a cost of $0.10/kW-hr.
For products with a long lifetime such as such as solar
inverters, this provides a savings of $750 in 15 years or
$1500 in 30 years.
80 PLUS Test Type
115V Internal Non-Redundant
230V Internal Redundant
Percent of Rated Load
20%
50%
100%
20%
50%
100%
80 PLUS Basic
80%
80%
80%
Not defined
Bronze
82%
85%
82%
81%
85%
81%
Silver
85%
88%
85%
85%
89%
85%
Gold
87%
90%
87%
88%
92%
88%
Platinum
90%
92%
89%
90%
94%
91%
Table 2. 80 PLUS Efficiency Levels. Per ENERGY STAR 5.0, desktop computer, laptop computer or server power supplies must comply with
the Bronze level. Source: Wikipedia.
Table 3. Performance comparison between circuits using 600 V / 20 A
Si-FRD and ROHM 600 V / 10A SBD (SCS110AG).
Si-FRD
ROHM SiC SBD
Peak reverse current
56 A
14 A
Power conversion efficiency
93.13%
95.57%
Harmonic distortion
2.42%
2.36%
ROHM Semiconductor
SiC Schottky Barrier Diodes
5


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