TECHNICAL

NOTES

Floating Outputs

Since these are isolated DC/DC converters, their outputs are "floating." Any

BWR model may be configured 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 specifications 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 filtering of these units to meet your specific requirements. Con-

tact our Applications Engineering Group for additional details.

➀ These power converters require a minimum 20% loading on each output to maintain

specified regulation. Operation under no-load conditions will not damage these devices;

however they may not meet all listed specifications.

➁ Application-specific internal input/output filtering can be recommended or perhaps added

internally upon request. Contact MPS Applications Engineering for details.

➂ Devices can be screened or modified for higher guaranteed isolation voltages.

Contact MPS Applications Engineering for details.

➃ D5A Models: Zener/transorb only

Performance/Functional Specifications

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

±5V Outputs

±1.5%, maximum

±12/15V Outputs

±1%, maximum

Temperature Coefficient

±0.02% per °C

Ripple/Noise (20MHz BW)

➁

See Ordering Guide

Line/Load Regulation

See Ordering Guide

Efficiency

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 final 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

D48A Models

Case Material

Corrosion resistant steel with

non-conductive, epoxy-based black

enamel finish 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 Specifications Table is not implied.

Absolute Maximum Ratings

BWR Models

7-10W, Dual Output DC/DC converters

MDC_BWR-7-10_D01 Page 3 of 5

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