FGLS12SR6040A Datasheet, PDF (6/21 Pages) List of Unclassifed Manufacturers – 4.5-14.4Vdc Input, 40A, 0.6-2.0Vdc Output

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FGLS12SR6040*A
4.5-14.4Vdc Input, 40A, 0.6-2.0Vdc Output
Preliminary Data Sheet
Design Considerations
Input Filtering
The FGLS12SR6040*A converters 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, ceramic capacitors
are recommended at the input of the module. Fig-1
shows the input ripple voltage for various output
voltages at 40A of load current with 4x22uF, 6x22uF
or 8x22uF ceramic capacitors and an input of 12V.
400
4x22uF Ext Cap
350
6x22uF Ext Cap
300
8x22uF Ext Cap
250
200
150
100
50
0.6 0.8 1 1.2 1.4 1.6 1.8 2
Output Voltage (Volts)
Fig-1: Input ripple voltage for various output
voltages with various ceramic capacitors at the
input (40A load). Input voltage is 12V. Scope
bandwidth limited to 20MHz.
Output Filtering
The FGLS12SR6040*A is designed for low output
ripple voltage and will meet the maximum output
ripple specification with 0.1uF ceramic and 47uF
ceramic capacitors at the output of the module.
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
polymer and ceramic capacitors are recommended to
improve the dynamic response of the module. Fig-2
provides output ripple information for different
external capacitance values at various Vo and a full
load current of 40A. 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^TM feature described later in this data sheet.
40
6x47uF Ext Cap
8x47uF Ext Cap
30
10x47uF Ext Cap
20
10
0
0.6 0.8 1 1.2 1.4 1.6 1.8 2
Output Voltage(Volts)
Fig-2: Output ripple voltage for various output
voltages with external 6x47uF, 8x47uF or
10x47uF ceramic capacitors at the output (40A
load). Input voltage is 12V. Scope bandwidth
limited to 20MHz.
Safety Consideration
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, CSA C22.2 No.
60950-1-07, DIN EN 60950-1:2006 + A11 (VDE0805
Teil 1 + A11):2009-11; EN 60950-1:2006 +
A11:2009-03.
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.
The input to these units is to be provided with a
fast-acting fuse with a maximum rating of 30A, 100V
(for example, Littlefuse 456 series) in the positive
input lead.
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Ver 1.5 May. 9, 2013