uwr-1.2-6000-d12a C&D Technologies., uwr-1.2-6000-d12a Datasheet - Page 4

• Manufacturer Part Number: uwr-1.2-6000-d12a
• Description: Single Output, A-series, Dc/dc Converters
• Manufacturer: C&D Technologies.

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
1.2 to 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 (20mA).
regulation may degrade. A 100µF output capacitor is recommended below 10%
loading. Users should verify whether this relaxed regulation will have any effect
on output circuits. If so, add a small load of 10% or greater.
However they may not meet all listed specifications.
Filtering and Noise Reduction
All A-Series UWR 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 appropri-
ate frequency response. All caps should have appropriate voltage ratings and be
mounted 2-3 inches from the converter to achieve published ratings.
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 requirements.
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 MPS's A-Series UWR 7-15 Watt DC/DC Converters, you
should use slow-blow type fuses with values no greater than the following.
For 12/15V models, operation below 20mA or 10% loading will be stable but
Operation under no-load conditions will not damage 12/15V converters.
The most effective combination of external I/O capacitors will be a function
"D12A" Models
"D24A" Models
"D48A" Models
V
IN
Range
Fuse Value
3 Amps
2 Amps
1 Amp
www.murata-ps.com
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 depend-
ing on its connection. Fixed resistors should have an absolute TCR less than
100ppm/°C to minimize sensitivity to changes in temperature.
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.
verter's performance and is not recommended.
Figure 3. Trim Connections To Decrease Output Voltage Using Fixed Resistors
A single resistor connected from the Trim (pin 5) to the +Output (pin 4), see
Trim adjustment greater than 5% can have an adverse effect on the con-
Figure 4. Trim Connections To Increase Output Voltage Using Fixed Resistors
2
3
2
3
1
1
1
2
3
+INPUT
+INPUT
–INPUT
ON/OFF
CONTROL
–INPUT
ON/OFF
CONTROL
+INPUT
–INPUT
ON/OFF
CONTROL
Figure 2. Trim Connections Using A Trim Pot
Single Output, A-Series, DC/DC Converters
Technical enquiries email: [e-mail], tel:
+OUTPUT
COMMON
+OUTPUT
COMMON
+OUTPUT
COMMON
TRIM
TRIM
TRIM
6
6
4
5
4
5
4
6
5
MDC_UWR Models.F01 Page 4 of 12
UWR Models
20kΩ
5-22
Turns
R
R
TRIM DOWN
TRIM UP
LOAD
LOAD
LOAD
[phone]