GE Industrial Solutions 12V Austin SuperLynx 16A - Manual (Page 12)

GE
Data Sheet
12V Austin SuperLynx TM 16A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 16A Output Current
May 7, 2013 ©2013 General Electric Company. All rights reserved. Page 12
Feature Description
Remote On/Off
The Austin SuperLynx TM 12V SMT power modules feature an
On/Off pin for remote On/Off operation of the module. If not
using the remote On/Off pin, leave the pin open (module will be
On). The On/Off pin signal (Von/Off) is referenced to ground. To
switch the module on and off using remote On/Off, connect an
open collector npn transistor between the On/Off pin and GND
(See Figure 27).
During a logic-high (On/Off pin is pulled high internal to the
module) when the transistor is in the Off state, the power
module is ON. The maximum allowable leakage current of the
transistor when Von/off = V
IN,max
is 10µA. During a logic-low
when the transistor is turned-on, the power module is OFF.
During this state VOn/Off is less than 0.3V and the maximum
IOn/Off = 1mA.
V
IN
(+)
GND
I
on/off
V
on/off
Enable
20k
20k
20k
20k
On/Off
+
-
Css
Figure 27. Remote On/Off Implementation.
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 3A.
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 protection in a fault condition, the unit is equipped
with a thermal shutdown circuit. The unit will shutdown if the
thermal reference point T
ref
, exceeds 125 o C (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.
Output Voltage Programming
The output voltage of the Austin SuperLynx TM 12V can be
programmed to any voltage from 0.75Vdc to 5.5Vdc by
connecting a resistor (shown as Rtrim in Figure 28) between
the Trim and GND pins of the module. Without an external
resistor between the Trim and GND pins, the output of the
module will be 0.7525Vdc. To calculate the value of the trim
resistor, Rtrim for a desired output voltage, use the following
equation:
Ω




−
−
= 1000
7525 . 0
10500
Vo
Rtrim
Rtrim is the external resistor in Ω
Vo is the desired output voltage
For example, to program the output voltage of the Austin
SuperLynx TM 12V module to 1.8V, Rtrim is calculated as follows:




−
−
= 1000
75 . 0 8 . 1
10500
Rtrim
Ω = k Rtrim 024 . 9
V
O
(+)
TRIM
GND
LOAD
V
IN
(+)
ON/OFF
Rtrim
Figure 28. Circuit configuration to program output voltage
using an external resistor.
Austin SuperLynx
TM 12Vdc can also be programmed by
applying a voltage between the TRIM and GND pins (Figure
29). The following equation can be used to determine the
value of Vtrim needed to obtain a desired output voltage Vo:
{ } ( )
7525 . 0 0667 . 0 7 . 0 − × − = Vo Vtrim
For example, to program the output voltage of a SuperLynx TM
module to 3.3 Vdc, Vtrim is calculated as follows:
{ }
) 7525 . 0 3 . 3 0667 . 0 7 . 0 ( − × − = Vtrim
V Vtrim 530 . 0 =