Datasheet
TECHNICAL NOTES
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "fl oating." Any
BWR model may be confi gured to produce an output of 10V, 24V or 30V (for
±5V, ±12V or ±15V models, respectively) by applying the load across the
+Output and –Output pins (pins 3 and 5), with either output grounded. The
Common pin (pin 4) should be left open. Minimum 20% loading is recom-
mended under these conditions.
Filtering and Noise Reduction
All A-Series BWR 7-10 Watt DC/DC Converters achieve their rated ripple
and noise specifi cations without the use of external input/output capaci-
tors. In critical applications, input/output ripple and noise may be further
reduced by installing electrolytic capacitors across the input terminals and/
or low-ESR tantalum or electrolytic capacitors across the output terminals.
Output capacitors should be connected between their respective output pin
(pin 3 or 5) and Common (pin 4) as shown in Figure 2. The caps should be
located as close to the power converters as possible. Typical values are
listed in the tables below. In many applications, using values greater than
those listed will yield better results.
To Reduce Input Ripple
"D5A" Models 47µF, 10V
"D12A" Models 20µF, 35V
"D48A" Models 10µF, 100V
To Reduce Output Ripple
±5V Output 47µF, 10V, Low ESR
±12/15V Outputs 22µF, 20V, Low ESR
In critical, space-sensitive applications, MPS may be able to tailor the internal
input/output fi ltering of these units to meet your specifi c requirements. Con-
tact our Applications Engineering Group for additional details.
➀ These power converters require a minimum 20% loading on each output to maintain
specifi ed regulation. Operation under no-load conditions will not damage these devices;
however they may not meet all listed specifi cations.
➁ Application-specifi c internal input/output fi ltering can be recommended or perhaps added
internally upon request. Contact MPS Applications Engineering for details.
➂ Devices can be screened or modifi ed for higher guaranteed isolation voltages.
Contact MPS Applications Engineering for details.
➃ D5A Models: Zener/transorb only
Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
Input
Input Voltage Range:
D5A Models 4.7-7.25 Volts (5V nominal)
D12A Models 9-18 Volts (12V nominal)
D48A Models 18-75 Volts (48V nominal)
Input Current See Ordering Guide
Input Filter Type
➁ Pi
Reverse-Polarity Protection Yes (Instantaneous, 6A maximum)
Output
VOUT Accuracy (50% load):
±5V Outputs ±1.5%, maximum
±12/15V Outputs ±1%, maximum
Temperature Coeffi cient ±0.02% per °C
Ripple/Noise (20MHz BW)
➁ See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage
➂ 1500Vdc, minimum (functional)
Isolation Capacitance 200pF
Current Limiting Auto-recovery
Overvoltage Protection ➃ Zener/transorb clamps, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step) 200µsec max. to ±1.5% of fi nal value
Switching Frequency 165kHz (±15kHz)
Environmental
Operating Temperature (ambient):
Without Derating –40 to +65/70°C (Model dependent)
With Derating to +100°C (See Derating Curves)
Storage Temperature –40 to +105°C
Physical
Dimensions 2" x 1" x 0.375" (51 x 25 x 9.5mm)
Shielding 5-sided
Case Connection:
D5A and D12A Models Pin 2 (–V
IN)
D48A Models Pin 1 (+V
IN)
Case Material Corrosion resistant steel with
non-conductive, epoxy-based black
enamel fi nish and palstic baseplate
Pin Material RoHS: Gold-plated copper alloy with nickel
underplate
Non-RoHS: Solder-coated brass
Weight 1.3 ounces (37 grams)
Flammability UL 94V-0
Input Voltage:
D5 Models 10 Volts
D12 Models 20 Volts
D48 Models 80Volts
Input Reverse-Polarity Protection Current must be <6A. Brief
duration only. Fusing recommended.
Output Overvoltage Protection
±5V Outputs 13 Volts, limited duration
±12V Outputs 28 Volts, limited duration
±15V Outputs 36 Volts, limited duration
Output Current Current limited. Max. current and
short-circuit duration are model
dependent.
Storage Temperature –40 to +105°C
Lead Temperature (soldering, 10 sec.) +300°C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifi cations Table is not implied.
Absolute Maximum Ratings
BWR Models
7-10W, Dual Output DC-DC converters
MDC_BWR-7-10.F01 Page 3 of 5
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