DC-DC CONVERTERS 20 W DC-DC Converters 1
2 YEAR WARRANTY
CXA20 Series
Single and dual output
•4:1 input voltage range
•No minimum load on singles
•6 A on 3.3 V output (@ 48 Vin) at 50 ˚C in still air
•Wide operating temperature with overtemperature
protection
•±10% output voltage trim
•Remote On/Off control
•Overvoltage protection
•Available RoHS complaint
The CXA20 is a new 20 W addition to the CXA family of open-frame, isolated, dc-dc
converters. The five model series features a 4:1 input voltage range of 18 Vdc to
75 Vdc, making it suitable for a wide variety of communications and distributed
power applications. With its 2.0 x 1.6 inch industry standard footprint, the CXA20
provides an easy upgrade option for new and existing Artesyn customers seeking a
high-performance, cost-effective power supply. The CXA20 is available in output
voltages of 3.3 V, 5 V, 12 V, ±5 V and ±12 V. The 3.3 V version delivering up to 6 A is
fully rated to 20 W. Typical efficiency for the CXA20 is 83%. The CXA20 offers remote
ON/OFF as well as overvoltage, overtemperature and short circuit protection
features.
All specifications are typical at nominal input, full load at 25 °C unless otherwise stated
EMC CHARACTERISTICS
ETS 300 386-1 table 5
Conducted emissions EN55022, ext. cap. (Note 5) Level A
EN55022, external filter, Level B
VDE0878, 48V models
Radiated emissions EN55022-B See App. Note 107
Immunity:
ESD air EN61000-4-2 8 kV (NP), 15 kV (RP)
ESD contact EN61000-4-2 6 kV (NP), 8 kV (RP)
EFT DC power EN61000-4-4 2 kV (NP), 4 kV (LFS)
EFT signal EN61000-4-4 1 kV (NP), 2 kV (LFS)
Radiated field enclosure EN61000-4-3 10 V/m (NP)
Surges indoor signal EN61000-4-5 500 V (RP)
Conducted (dc power) EN61000-4-6 10 V (NP)
Conducted (signal) EN61000-4-6 10 V (NP)
Input transients ETS 300 132-2, ETR 283
GENERAL SPECIFICATIONS
Efficiency See table
Overtemp. shutdown 120 ˚C
Isolation voltage Input/output test voltage 1500 Vdc
Switching frequency Fixed 400 kHz
Approvals and standards
EN60950
(See Notes 6,7,8) UL1950 File No. E136005
Material flammability UL94V-0
Weight 26 g (0.92 oz)
MTBF MIL-HDBK-217F 3,485,000 hours
(Representative model Parts stress method
48S05J @ 48 Vin) Ground Benign @ 25 °C
ENVIRONMENTAL SPECIFICATIONS
Thermal performance Operating ambient -40 °C to +60 °C,
temperature (See Note 9)
Non-operating -55 °C to +125 °C
ETS 300 019-2-3 Classes T3.1, 3.2, 3.3, 3.5
Air temperature Low: IEC 68-2-1 -40 °C
High: IEC 68-2-2 +60 °C
Change: IEC 68-2-14 -40 °C to +60 °C
Relative humidity IEC 68-2-56 10% to 100% RH
IEC 68-2-30 Condensation
OUTPUT SPECIFICATIONS
Voltage accuracy ±1.0%
Line regulation Singles/dual positives ±0.1%
(LL to HL) Dual negatives ±0.1%
Load regulation Full load to minimum load
(not incl. cross reg.) S3V3 ±0.2%
Singles/dual positives ±0.1%
Dual negatives ±0.1%
Minimum load Singles None
Duals (for imbalanced loads) 10%
Ripple and noise S3V3, S05, D05 75 mV pk-pk max.
20 MHz bandwidth S12, D12 100 mV pk-pk max.
All models 20 mV rms max.
Temperature coefficient ±0.02%/°C
Overvoltage protection See Application Note 107
Short circuit protection Hiccup Continuous
Short <20 mΩautomatic recovery
Transient response 25% load step ±2.0% max. dev.,
300 µs recovery to
within total error band
Load cross regulation 10% load to full load, ±7.0%
(See Note 1) either output
INPUT SPECIFICATIONS
Input voltage range 48 Vin nominal 18-75 Vdc
Input fuse HRC recommended 2.0 A
Max. input rise 48 V ETS300-132 5 V/ms
and fall time
UVLO turn ON voltage (See Note 4) 92%
UVLO turn OFF voltage (See Note 4) 86%
Remote ON/OFF
Logic compatibility CMOS/TTL/Open Collector
ON Open circuit or >2 Vdc
OFF <1.2 Vdc
SPECIFICATIONS
File Name: cxa20.pdf Rev (02): 09 Dec 2005