FGSD12SR6003A Datasheet, PDF (8/41 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
Analog Feature Descriptions
Remote On/Off
The module can be turned ON and OFF either by
using the ON/OFF pin (Analog interface) or through
the PMBus interface (Digital). The module can be
configured in a number of ways through the PMBus
interface to react to the two ON/OFF inputs:
 Module ON/OFF can be controlled only through
the analog interface (digital interface ON/OFF
commands are ignored)
 Module ON/OFF can be controlled only through
the PMBus interface (analog interface is ignored)
 Module ON/OFF can be controlled by either the
analog or digital interface
The default state of the module (as shipped from the
factory) is to be controlled by the analog interface
only. If the digital interface is to be enabled, or the
module is to be controlled only through the digital
interface, this change must be made through the
PMBus. These changes can be made and written to
non-volatile memory on the module so that it is
remembered for subsequent use.
Analog ON/OFF
The FGSD12SR6003*A power modules feature an
On/Off pin for remote On/Off operation. Two On/Off
logic options are available. In the Positive Logic
On/Off option, (device code suffix “P” - see Ordering
Information), the module turns ON during a logic High
on the On/Off pin and turns OFF during a logic Low.
With the Negative Logic On/Off option, (device code
suffix “N” - see Ordering Information), the module
turns OFF during logic High and ON during logic Low.
The On/Off signal should be always referenced to
ground. For either On/Off logic option, leaving the
On/Off pin disconnected will turn the module ON
when input voltage is present.
For positive logic modules, the circuit configuration
for using the On/Off pin is shown in Fig-3. When the
external transistor Q2 is in the OFF state, the internal
transistor Q1 is turned ON, and the internal PWM
#Enable signal is pulled low causing the module to be
ON. When transistor Q2 is turned ON, the On/Off pin
is pulled low and the module is OFF. A suggested
value for R_pullup is 20k.
For negative logic On/Off modules, the circuit
configuration is shown in Fig-4. The On/Off pin
should be pulled high with an external pull-up resistor
(suggested value for the 3V to 14V input range is
20K). When transistor Q2 is in the OFF state, the
On/Off pin is pulled high, transistor Q1 is turned ON
and the module is OFF. To turn the module ON, Q2
Preliminary Data Sheet
is turned ON pulling the On/Off pin low, turning
transistor Q1 OFF resulting in the PWM Enable pin
going high.
MODULE
+VIN
+3.3V
Rpullup
ION/OFF
22K
+
Q2
VON/OFF
_
GND
10K
ENABLE
Q1
22K
Fig-3: Circuit configuration for using positive
On/Off logic.
MODULE
+VIN
+3.3V
Rpullup
ION/OFF
+
Q2
VON/OFF
10K
ENABLE
22K
Q1
22K
_
GND
Fig-4: Circuit configuration for using negative
On/Off logic.
Digital ON/OFF
Please see the Digital Feature Descriptions section.
Monotonic Start-up and Shut-down
The module has monotonic start-up and shutdown
behavior for any combination of rated input voltage,
output current and operating temperature range.
Startup into Pre-biased Output
The module can start into a prebiased output as long
as the prebias voltage is 0.5V less than the set output
voltage.
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Ver 1.6 May. 8, 2013