FGSD12SR6003A Datasheet, PDF (7/41 Pages) List of Unclassifed Manufacturers – 3-14.4Vdc Input, 3A, 0.45-5.5Vdc Output

Delivering Next Generation Technology
Series
FGSD12SR6003*A
3-14.4Vdc Input, 3A, 0.45-5.5Vdc Output
Design Considerations
Input Filtering
The FGSD12SR6003*A converter 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. High
frequency switching noise can be reduced by using
suitable decoupling ceramic caps.
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 3A of load current with 1x22uF or 2x22uF
ceramic capacitors and an input of 12V.
140
130
1x22uF
2x22uF
Vp-p)¹¹¹²⁰⁰
ipple(m¹⁰⁹⁰⁰
R₈₀
70
60
0.5
1.5
2.5
3.5
4.5
Output Voltage(Volts)
Fig-1: Input ripple voltage for various output
voltages with 1x22uF or 2x22uF ceramic
capacitors at the input (3A load). Input voltage is
12V.
Output Filtering
The FGSD12SR6003*A is designed for low output
ripple voltage and will meet the maximum output
ripple specification with 0.1uF ceramic and 22uF
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
Preliminary Data Sheet
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 3A. 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™ feature described later in this data sheet.
50
1x10uF Ext Cap
1x22uF Ext Cap
Vp-p) ³⁴⁰⁰
1x47uF Ext Cap
2x47uF Ext Cap
(m
ipple ²⁰
R₁₀
0
0.5
1.5
2.5
3.5
4.5
Output Voltage(Volts)
Fig-2: Output ripple voltage for various output
voltages with external 1x10uF, 1x22uF, 1x47uF
or 2x47uF ceramic capacitors at the output (3A
load). Input voltage is 12V.
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 5 A in the
positive input lead. An example of such a fuse is the
ABC series by Littelfuse.
Http://www.fdk.com
Page 7 of 41
Ver 1.6 May. 8, 2013