UWR-12/1250-D12A 查看數據表（PDF） - DATEL Data Acquisition products

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UWR-12/1250-D12A

High-Density, 2" x 1" 1-6 Amp, 9-15 Watt DC/DC's

DATEL Data Acquisition products  

A Series

9-15W, SINGLE OUTPUT DC/DC CONVERTERS

TECHNICAL NOTES

Floating Outputs

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

Designers will usually use the output Common (pin 6) as the ground/return of

the load circuit. You can, however, use the +Output (pin 4) as ground/return to

effectively reverse the output polarity.

Minimum Output Loading Requirements

1.5-5V models employ a synchronous-rectifier design topology. All models

regulate within spec and are stable under no-load conditions. 12/15V models

employ a traditional forward architecture and require 10% loading (125mA for

12V models, 100mA for 15V models) to achieve their listed regulation specs.

12/15V models also have a minimum-load-for-stability requirement (25mA).

For 12/15V models, operation between 25mA and 10% loading will result

in stable operation but regulation may degrade. Operation under no-load

conditions will not damage the 12/15V devices; however they may not meet

all listed specifications.

Filtering and Noise Reduction

All A-Series UWR 9-15 Watt DC/DC Converters achieve their rated ripple and

noise specifications using the external input and output capacitors specified

in the Performance/Functional Specifications table. In critical applications,

input/output noise may be further reduced by installing additional external I/O

caps. Input capacitors should be selected for bulk capacitance, low ESR and

high rms-ripple-current ratings. Output capacitors should be selected for low

ESR and appropriate frequency response. All caps should have appropriate

voltage ratings and be mounted as close to the converters as possible.

The most effective combination of external I/O capacitors will be a function

of your particular load and layout conditions. Our Applications Engineers will

be happy to recommend potential solutions and can discuss the possibility of

our modifying a given device’s internal filtering to meet your specific require-

ments. Contact our Applications Engineering Group for additional details.

Input Fusing

Certain applications and/or safety agencies may require the installation of

fuses at the inputs of power conversion components. Fuses should also be

used if the possibility of sustained, non-current-limited, input-voltage polarity

reversals exists. For DATEL A-Series UWR 9-15 Watt DC/DC Converters, you

should use slow-blow type fuses with values no greater than the following.

VIN Range

"D12A" Models

"D24A" Models

"D48A" Models

Fuse Value

3 Amps

2 Amps

1 Amp

Trimming Output Voltages

These converters have a trim capability (pin 5) that allows users to adjust the

output voltage ±5%. Adjustments to the output voltage can be accomplished

via a trim pot, Figure 2, or a single fixed resistor as shown in Figures 3 and 4.

A single fixed resistor can increase or decrease the output voltage depending

on its connection. Fixed resistors should have an absolute TCR less than

100ppm/°C to minimize sensitivity to changes in temperature.

A single resistor connected from the Trim (pin 5) to the +Output (pin 4), see

Figure 3, will decrease the output voltage. A resistor connected from the Trim

(pin 5) to Output Common (pin 6) will increase the output voltage.

Trim adjustment greater than 5% can have an adverse effect on the convert-

er's performance and is not recommended.

1

+INPUT

2

–INPUT

3 ON/OFF

CONTROL

4

+OUTPUT

5

TRIM

6

COMMON

20kΩ

5-22

Turns

LOAD

Figure 2. Trim Connections Using A Trim Pot

1

+INPUT

2

–INPUT

3 ON/OFF

CONTROL

4

+OUTPUT

5

TRIM

RTRIM DOWN

LOAD

6

COMMON

Figure 3. Trim Connections To Decrease Output Voltage Using Fixed Resistors

1

+INPUT

2

–INPUT

3 ON/OFF

CONTROL

4

+OUTPUT

5

TRIM

6

COMMON

LOAD

RTRIM UP

Figure 4. Trim Connections To Increase Output Voltage Using Fixed Resistors

Model

Trim Equation

UWR-3.3/4250-D12A

UWR-3.3/4250-D24A

UWR-3.3/4250-D48A

UWR-5/3000-D12A

UWR-5/3000-D24A

UWR-5/3000-D48A

UWR-12/1250-D12A

UWR-12/1250-D24A

UWR-12/1250-D48A

UWR-15/1000-D12A

UWR-15/1000-D24A

UWR-15/1000-D48A

RTDOWN (kΩ) =

2.49(VO – 1.27)

3.3 – VO

–16.9

RTUP (kΩ) =

3.16

VO – 3.3

–16.9

RTDOWN (kΩ) =

2.49(VO – 2.527)

5 – VO

–15

RTUP (kΩ) =

6.292

VO – 5

–15

RTDOWN (kΩ) =

6.34(VO – 5.714)

12 – VO

–49.9

RTUP (kΩ) =

36.23

VO – 12

–49.9

RTDOWN (kΩ) =

7.87(VO – 7.136)

15 – VO

–63.4

RTUP (kΩ) =

56.16

VO – 15

–63.4

Accuracy of adjustment is subject to tolerances or resistor values

and factory-adjusted output accuracy. VO = desired output voltage.

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