Data Sheet
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
4.5 – 5.5Vdc input; 0.8 to 3.63Vdc Output; 30A output current
6.0 – 14Vdc Input; 0.8Vdc to 3.63Vdc Output; 20/30A output
June 3, 2009
The ATS030A0X3-62SRHZ and ATS030A0X3-
62SRPHZ modules have a higher value resistor of
100K connected internally between the gate and
source of the internal FET used to control the PWM
Enable line.
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
Sense
RLOAD
Rdistribution Rcontact
Rcontact Rdistribution
The On/Off pin can also be used to synchronize the
output voltage start-up and shutdown of multiple
modules in parallel. By connecting On/Off pins of
multiple modules, the output start-up can be
synchronized (please refer to characterization
curves). When On/Off pins are connected together,
all modules will shutdown if any one of the modules
gets disabled due to undervoltage lockout or over
temperature protection.
CO M
CO M
Figure 51. Effective Circuit Configuration for
Remote Sense operation.
Over Current 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 average
VIN+
MODULE
R1
Thermal SD
I
output current during hiccup is 10% IO, max
.
ON/OFF
+
1K
PWM Enable
100K
ON/OFF
Over Temperature Protection
V
ON/OFF
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit
will shutdown if the overtemperature threshold of
125oC is exceeded at the thermal reference point
Tref. The thermal shutdown is not intended as a
guarantee that the unit will survive temperatures
beyond its rating. Once the unit goes into thermal
shutdown it will then wait to cool before attempting
to restart.
Q1
10K
GND
_
Figure 50. Remote On/Off Implementation
using ON/OFF .
Remote Sense
Input Under Voltage Lockout
The Austin MegaLynxTM SMT power modules have
a Remote Sense feature to minimize the effects of
distribution losses by regulating the voltage at the
Remote Sense pin (See Figure 51). The voltage
between the Sense pin and Vo pin must not exceed
0.5V.
At input voltages below the input undervoltage
lockout limit, the module operation is disabled. The
module will begin to operate at an input voltage
above the undervoltage lockout turn-on threshold.
Output Voltage Programming
The amount of power delivered by the module is
defined as the output voltage multiplied by the
output current (Vo x Io). When using Remote
Sense, the output voltage of the module can
increase, which, if the same output is maintained,
increases the power output by the module. Make
sure that the maximum output power of the module
remains at or below the maximum rated power.
When the Remote Sense feature is not being used,
connect the Remote Sense pin to output of the
module.
The output voltage of the Austin MegaLynxTM can
be programmed to any voltage from 0.8dc to
3.63Vdc by connecting a resistor (shown as Rtrim in
Figure 52) between Trim and GND pins of the
module. Without an external resistor between Trim
and GND pins, the output of the module will be
0.8Vdc. To calculate the value of the trim resistor,
R
trim for a desired output voltage, use the following
equation:
1200
⎡
⎤
Rtrim
=
−100 Ω
⎢
⎣
⎥
⎦
Vo − 0.80
Rtrim is the external resistor in Ω
LINEAGE POWER
16
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
