Data Sheet
Austin SuperLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 16A output current
April 8, 2008
temperatures beyond its rating. The module will
automatically restarts after it cools down.
Feature Description
Remote On/Off
The Austin SuperLynxTM 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 pnp transistor between the On/Off pin and the
Output Voltage Programming
The output voltage of the Austin SuperLynxTM 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:
VIN pin (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 = VIN,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.
10500
⎡
⎤
Rtrim =
−1000 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
Rtrim is the external resistor in Ω
Vo is the desired output voltage
For example, to program the output voltage of the Austin
SuperLynxTM 12V module to 1.8V, Rtrim is calculated as
follows:
VIN(+)
20k
10500
⎡
⎤
Rtrim =
−1000
On/Off
⎢
⎣
⎥
⎦
1.8 − 0.75
20k
Ion/off
Rtrim = 9.024kΩ
+
Enable
Css
20k
20k
Von/off
-
VIN(+)
VO(+)
GND
Figure 27. Remote On/Off Implementation.
LOAD
ON/OFF
TRIM
Overcurrent Protection
Rtrim
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
GND
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.
Figure 28. Circuit configuration to program output
voltage using an external resistor.
Input Undervoltage Lockout
Austin SuperLynxTM 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:
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.
Vtrim =
(
0.7 − 0.0667×
{Vo − 0.7525})
Overtemperature Protection
For example, to program the output voltage of a
SuperLynxTM module to 3.3 Vdc, Vtrim is calculated as
follows:
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 Tref, exceeds
125oC (typical), but the thermal shutdown is not
intended as a guarantee that the unit will survive
Vtrim = (0.7 − 0.0667×
Vtrim = 0.530V
{
3.3− 0.7525 )
}
LINEAGE POWER
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
