Data Sheet
Austin SuperLynxTM SIP Non-isolated Power Modules:
September 9, 2008
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 16A output current
Output Voltage Programming
The output voltage of the Austin SuperLynxTM SIP can
be programmed to any voltage from 0.75 Vdc to 3.63
Feature Description
Remote On/Off
The Austin SuperLynxTM SIP power modules feature an
On/Off pin for remote On/Off operation. The On/Off pin
is pulled high with an external pull-up resistor (typical
Rpull-up = 68k, ± 5%) as shown in Fig. 28. 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 1.5Vdc. 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.
Vdc by connecting a single resistor (shown as Rtrim in
Figure 29) between the TRIM and GND pins of the
module. Without an external resistor between the TRIM
pin and the ground, the output voltage of the module is
0.7525 Vdc. To calculate the value of the resistor Rtrim
for a particular output voltage Vo, use the following
equation:
21070
⎡
⎤
Rtrim =
−5110 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
VIN+
For example, to program the output voltage of the
Austin SuperLynxTM module to 1.8 Vdc, Rtrim is
calculated is follows:
MODULE
R
pull-up
I
ON/OFF
ON/OFF
21070
⎡
⎤
Rtrim =
− 5110 Ω
⎢
⎣
⎥
+
PWM Enable
1.8 − 0.7525
⎦
V
ON/OFF
R1
R2
Rtrim =15.004kΩ
Q2
CSS
Q1
VIN(+)
VO(+)
GND
_
Figure 28. Circuit configuration for On/Off.
Overcurrent Protection
LOAD
ON/OFF
TRIM
R
trim
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.
GND
Figure 29. Circuit configuration to program output
voltage using an external resistor.
The Austin SuperLynxTM can also be programmed by
applying a voltage between the TRIM and GND pins
(Figure 30). The following equation can be used to
determine the value of Vtrim needed to obtain a desired
output voltage Vo:
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.
Vtrim =
(
0.7 − 0.1698×
{
Vo − 0.7525})
For example, to program the output voltage of a
SuperLynxTM module to 3.3 Vdc, Vtrim is calculated as
follows:
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 Tref,
exceeds 125oC (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.
Vtrim = (0.7 − 0.1698×
{
3.3− 0.7525 )
}
Vtrim = 0.2670V
LINEAGE POWER
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
