The
NQR010A0X4 10A module should be connected to a low ac-impedance source.
A highly inductive source can affect the stability of the module. An
input capacitance must be placed directly adjacent to the input pin of
the module, to minimize input ripple voltage and ensure module
stability. To minimize input voltage ripple, low-ESR ceramic or
polymer capacitors are recommended at the input of the module. Figure 4
shows the input ripple voltage for various output voltages at 10A of
load current with 1x22 μF or 2x22 μF ceramic capacitors and an input of
12V. 
Input
ripple voltage for various output voltages with 1x22 µF or 2x22 µF
ceramic capacitors at the input (10A load). Input voltage is 12V.
| The
NQR010A0X4 10A module is designed for low output ripple voltage and
will meet the maximum output ripple specification with no external
capacitors. However, additional output filtering may be required by the
system designer for a number of reasons. First, there may be a need to
further reduce the output ripple and noise of the module. Second, the
dynamic response characteristics may need to be customized to a
particular load step change. To reduce the output ripple and improve
the dynamic response to a step load change, additional capacitance at
the output can be used. Low ESR ceramic and polymer are recommended to
improve the dynamic response of the module. Figure 5 provides output
ripple information for different external capacitance values at various
Vo and for a load current of 10A. For stable operation of the module,
limit the capacitance to less than the maximum output capacitance as
specified in the electrical specification table. Optimal performance of the module can be achieved by using the Tunable Loop™.
Output ripple voltage for various output voltages with external 1x10µF, 1x47uF, 2x47uF, or 4x47uF ceramic capacitors at the output (10A load). Input voltage is 12V.
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For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., UL 60950-1 2nd Edition, CSA C22.2 No. 60950-1- 07, and VDE 0805-1+A11:2009-11 (DIN EN60950-1 2nd Edition) Licensed. For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. A 15A quick acting input fuse for the module is required. |