Data Sheet
12V Austin MiniLynxTM: SIP Non-Isolated DC-DC Power Modules
8.3Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 3A Output Current
©2015 General Electric Company. All rights reserved.
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Feature Description
Remote On/Off
Austin MiniLynxTM 12V SIP power modules feature an On/Off pin
for remote On/Off operation. Two On/Off logic options are
available in the Austin MiniLynxTM 12V series modules. Positive
Logic On/Off signal, device code suffix “4”, turns the module ON
during a logic High on the On/Off pin and turns the module OFF
during a logic Low. Negative logic On/Off signal, no device code
suffix, turns the module OFF during logic High and turns the
module ON during logic Low.
For positive logic modules, the circuit configuration for using the
On/Off pin is shown in Figure 27. The On/Off pin is an open
collector/drain logic input signal (Von/Off) that is referenced to
ground. During a logic-high (On/Off pin is pulled high internal to
the module) when the transistor Q1 is in the Off state, the power
module is ON. Maximum allowable leakage current of the
transistor when Von/off = VIN,max is 10µA. Applying a logic-low
when the transistor Q1 is turned-On, the power module is OFF.
During this state VOn/Off must be less than 0.3V. When not
using positive logic On/off pin, leave the pin unconnected or tie
to VIN.
Q1
R2
R1 Q2
R3
R4
Q3 CSS
GND
VIN+
ON/OFF
PW M Enable
+
_
ON/OFF
V
I
ON/OFF
MODULE
Figure 27. Circuit configuration for using positive logic
On/OFF.
For negative logic On/Off devices, the circuit configuration is
shown is Figure 28. The On/Off pin is pulled high with an
external pull-up resistor (typical Rpull-up = 68k, +/- 5%). When
transistor Q1 is in the Off state, logic High is applied to the
On/Off pin and the power module is Off. The minimum On/off
voltage for logic High on the On/Off pin is 2.5 Vdc. To turn the
module ON, logic Low is applied to the On/Off pin by turning ON
Q1. When not using the negative logic On/Off, leave the pin
unconnected or tie to GND.
Q1
R1
R2
Q2 CSS
GND
PW M Enable
ON/OFF
VIN+
ON/OFF
_
+
V
I
MODULE
pull-up
R
ON/OFF
Figure 28. Circuit configuration for using negative
logic On/OFF.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its
specified range. The typical average output current
during hiccup is 3.5A.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Overtemperature Protection
To provide over temperature protection in a fault
condition, the unit relies upon the thermal protection
feature of the controller IC. The unit will shutdown if the
thermal reference point Tref2, (see Figure 31) exceeds
140oC (typical), but the thermal shutdown is not
intended as a guarantee that the unit will survive
temperatures beyond its rating. The module will
automatically restarts after it cools down.