FGSR12SR6003A Datasheet, PDF (8/23 Pages) List of Unclassifed Manufacturers – 3-14.4Vdc Input, 3A, 0.6-5.5Vdc Output

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FGSR12SR6003*A
3-14.4Vdc Input, 3A, 0.6-5.5Vdc Output
Data Sheet
Output Voltage Programming
The output voltage of the module is programmable to
any voltage from 0.6dc to 5.5Vdc by connecting a
resistor between the Trim and SIG_GND pins of the
module. Certain restrictions apply on the output
voltage set point depending on the input voltage.
These are shown in the Output Voltage vs. Input
Voltage Set Point Area plot in Fig-5. The Upper Limit
curve shows that for output voltages lower than 1V,
the input voltage must be lower than the maximum of
14.4V. The Lower Limit curve shows that for output
voltages higher than 0.6V, the input voltage needs to
be larger than the minimum of 3V.
16
14
12
Upper Limit
10
InputVoltage⁴⁶⁸
2
Lower Limit
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Output Voltage
Fig-5: Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
R _TRIM
12
 _{(VO-REQ - 0.6)}
[kΩ]
Rtrim is the external resistor in kohm
Vo-req is the desired output voltage
Note that the tolerance of a trim resistor will affect the
tolerance of the output voltage. Standard 1% or 0.5%
resistors may suffice for most applications; however,
a tighter tolerance can be obtained by using two
resistors in series instead of one standard value
resistor.
Table 1 lists calculated values of R_TRIM for common
output voltages. For each value of R_TRIM, Table 1 also
shows the closest available standard resistor value.
Table 1: Trim Resistor Value
V_O-REG [V]
0.6
R_TRIM [kΩ]
Open
0.9
40
1.0
30
1.2
20
1.5
13.33
1.8
10
2.5
6.316
3.3
4.444
5.0
2.727
Remote Sense
VIN(+)
VO(+)
ON/OFF
VS+
TRIM
LOAD
Rtrim
GND
Fig-6: Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
Without an external resistor between Trim and
SIG_GND pins, the output of the module will be
0.6Vdc. To calculate the value of the trim resistor,
Rtrim for a desired output voltage, should be as per
the following equation:
The power module has a Remote Sense feature to
minimize the effects of distribution losses by
regulating the voltage at the SENSE pin. The
voltage between the SENSE pin and VOUT pin
should not exceed 0.5V.
Voltage Margining
Output voltage margining can be implemented in the
module by connecting a resistor, Rmargin-up, from
the Trim pin to the ground pin for margining-up the
output voltage and by connecting a resistor,
Rmargin-down, from the Trim pin to output pin for
margining-down. Fig-7 shows the circuit configuration
for output voltage margining.
The POL Programming Tool, available at
www.fdk.com under the Downloads section, also
calculates the values of Rmargin-up and
Rmargin-down for a specific output voltage and %
margin. Please consult your local FDK FAE for
additional details.
Http://www.fdk.com
Page 8 of 23
Ver 2.0 Nov. 11, 2013