FGSD12SR6003A Datasheet, PDF (12/41 Pages) List of Unclassifed Manufacturers – 3-14.4Vdc Input, 3A, 0.45-5.5Vdc Output

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FGSD12SR6003*A
3-14.4Vdc Input, 3A, 0.45-5.5Vdc Output
Tunable Loop™
The module has a feature that optimizes transient
response of the module called Tunable Loop™
External capacitors are usually added to the output of
the module for two reasons: to reduce output ripple
and noise (see Fig-2) and to reduce output voltage
deviations from the steady-state value in the
presence of dynamic load current changes. Adding
external capacitance however affects the voltage
control loop of the module, typically causing the loop
to slow down with sluggish response. Larger values
of external capacitance could also cause the module
to become unstable.
The Tunable Loop™ allows the user to externally
adjust the voltage control loop to match the filter
network connected to the output of the module. The
Tunable Loop™ is implemented by connecting a
series R-C between the SENSE and TRIM pins of the
module, as shown in Fig-11. This R-C allows the user
to externally adjust the voltage loop feedback
compensation of the module.
Preliminary Data Sheet
meet 2% output voltage deviation limits for some
common output voltages in the presence of a 1.5A to
3.0A step change (50% of full load), with an input
voltage of 12V.
Please contact your GE technical representative to
obtain more details of this feature as well as for
guidelines on how to select the right value of external
R-C to tune the module for best transient
performance and stable operation for other output
capacitance values.
Table 2: General recommended value of R_TUNE
and C_TUNE for Vin=12V and various external
ceramic capacitor combinations.
Co 1x47uF 2x47uF 4x47uF 6x47uF 10x47uF
R_TUNE 270
C_TUNE 1500pF
220
1800pF
180
3300pF
180
4700pF
180
4700pF
Table 3: Recommended values of R_TUNE and
C_TUNE to obtain transient deviation of 2% of Vout
for a 3A step load with Vin=12V.
Vo 5V 3.3V 2.5V 1.8V 1.2V 0.6V
Co
1x47uF
1x47uF
2x47uF
1x330uF 1x330uF 2x330uF
Polymer Polymer Polymer
R_TUNE 270
220
180
180
180
180
C_TUNE 1500pF 1800pF 3300pF 8200pF 8200pF 33nF
△V 68mV 60mV 37mV 18mV 18mV 10mV
Note: The capacitors used in the Tunable Loop
table are 47uF/3mΩ ESR ceramic and
330uF/12mΩ ESR polymer capacitors.
Fig-11: Circuit diagram showing connection of
R_TUNE and C_TUNE to tune the control loop of the
module.
Recommended values of R_TUNE and C_TUNE for
different output capacitor combinations are given in
Table 2. Table 2 shows the recommended values of
R_TUNE and C_TUNE for different values of ceramic output
capacitors up to 1000uF that might be needed for an
application to meet output ripple and noise
requirements. Selecting R_TUNE and C_TUNE according to
Table 2 will ensure stable operation of the module.
In applications with tight output voltage limits in the
presence of dynamic current loading, additional
output capacitance will be required. Table 3 lists
recommended values of R_TUNE and C_TUNE in order to
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Ver 1.6 May. 8, 2013