Datasheet

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 3 and 6), with either output grounded. The
Common (pin 4) should be left open. Minimum 20% loading is recom-
mended under these conditions.
Filtering and Noise Reduction
All BWR 5 Watt DC-DC Converters achieve their rated ripple and noise
specifi cations without the use of external input/output capacitors. In critical
applications, input/output ripple and noise may be further reduced by install-
ing low-ESR, tantalum or electrolytic capacitors across the input
and/or output terminals. Output capacitors should be connected between
their respective output pin (pin 3 or 6) and Common (pin 4) as shown in
Figure 2. The capacitors should be located as close to the power convert-
ers as possible. Typical values are listed below. In many applications, using
values greater than those listed will yield better results.
To Reduce Input Ripple
"D24" Models 20µF, 50V
"D48" Models 10µF, 100V
To Reduce Output Ripple
±5V Outputs 47µF, 10V, Low ESR
±12/15V Outputs 33µF, 20V, Low ESR
In critical, space-sensitive applications, MPS may be able to tailor the inter-
nal input/output fi ltering of these units to meet your specifi c requirements.
Contact our Applications Engineering Group for additional details.
Performance/Functional Specifi cations
Input
Input Voltage Range:
"D24" Models 18-36 Volts (24V nominal)
"D48" Models 36-72 Volts (48V nominal)
Input Current See Ordering Guide
Input Filter Type ➁ LC on "D24" models
C on "D48" models
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 Regulation See Ordering Guide
Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage ➂ 1000Vdc, minimum
Current Limiting Auto-recovery
Overvoltage Protection Zener/transorb clamps
Dynamic Characteristics
Transient Response (50% load step) 500µsec max. to ±1.5% of fi nal value
Switching Frequency 170kHz (±10kHz)
Environmental
Operating Temperature (ambient): ➃
Without Derating –25 to +60°C
With Derating to +95°C (See Derating Curve)
Storage Temperature –55 to +125°C
Physical
Dimensions 1" x 1" x 0.45" (25.4 x 25.4 x 11.4mm)
Shielding 5-sided
Case Connection:
"D24" Models Pin 2 (–V
IN)
"D48" Models Pin 1 (+V
IN)
Case Material Corrosion resistant steel with
epoxy-based enamel fi nish
Pin Material Gold-plated copper alloy
Weight 0.7 ounces (20 grams)
Flammability UL 94-0
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
➀ These power converters require a minimum 20% loading 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 and perhaps
added internally on request. Contact MPS Applications Engineering for details.
➂ Units can be screened or modifi ed for higher guaranteed isolation voltages.
Contact MPS Applications Engineering for details.
➃ Units can be screened for lower-temperature operation.
Contact MPS Applications Engineering for details.
Input Voltage:
"D24" Models 44 Volts
"D48" Models 88 Volts
Input Reverse-Polarity Protection Current must be <6A. Brief
duration only. Fusing recommended.
Output Overvoltage Protection
±5V Outputs 6.8 Volts, limited duration
±12V Outputs 15 Volts, limited duration
±15V Outputs 18 Volts, limited duration
Output Current Current limited. Max. current and
short-circuit duration are model
dependent.
Storage Temperature –55 to +125°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
Technical Notes
BWR Models
Miniature 5 Watt DC-DC Converters
MDC_BWR_5W.D01 Page 3 of 5
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