FGSD12SR6003A Datasheet, PDF (10/41 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
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.
Series
Preliminary Data Sheet
Fig-8: Circuit showing connection of the
sequencing signal to the SEQ pin.
Fig-7: Circuit Configuration for margining Output
Voltage.
Digital Output Voltage Margining
Please see the Digital Feature Descriptions section.
Output Voltage Sequencing
The power module includes a sequencing feature,
EZSEQUENCE that enables users to implement
various types of output voltage sequencing in their
applications. This is accomplished via an additional
sequencing pin. When not using the sequencing
feature, leave it unconnected.
The voltage applied to the SEQ pin should be scaled
down by the same ratio as used to scale the output
voltage down to the reference voltage of the module.
This is accomplished by an external resistive divider
connected across the sequencing voltage before it is
fed to the SEQ pin as shown in Fig-8. In addition, a
small capacitor (suggested value 100pF) should be
connected across the lower resistor R1.
For all Tomodachi modules, the minimum
recommended delay between the ON/OFF signal and
the sequencing signal is 10ms to ensure that the
module output is ramped up according to the
sequencing signal. This ensures that the module
soft-start routine is completed before the sequencing
signal is allowed to ramp up.
When the scaled down sequencing voltage is applied
to the SEQ pin, the output voltage tracks this voltage
until the output reaches the set-point voltage. The
final value of the sequencing voltage must be set
higher than the set-point voltage of the module. The
output voltage follows the sequencing voltage on a
one-to-one basis. By connecting multiple modules
together, multiple modules can track their output
voltages to the voltage applied on the SEQ pin.
The module’s output can track the SEQ pin signal
with slopes of up to 0.5V/msec during power-up or
power-down.
To initiate simultaneous shutdown of the modules,
the SEQ pin voltage is lowered in a controlled
manner. The output voltage of the modules tracks the
voltages below their set-point voltages on a
one-to-one basis. A valid input voltage must be
maintained until the tracking and output voltages
reach ground potential.
Note that in all digital Tomodachi series of modules,
the PMBus Output Undervoltage Fault will be tripped
when sequencing is employed. This will be detected
using the STATUS_WORD and STATUS_VOUT
PMBus commands. In addition, the SMBALERT#
signal will be asserted low as occurs for all faults and
warnings. To avoid the module shutting down due to
the Output Undervoltage Fault, the module must be
set to continue operation without interruption as the
response to this fault (see the description of the
PMBus command VOUT_UV_FAULT_RESPONSE
for additional information).
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Ver 1.6 May. 8, 2013