Data Sheet
September 7, 2011
GigaTLynx
TM
SMT Non-isolated Power Modules:
4.5 – 14Vdc input; 0.7Vdc to 2.0Vdc, 50A Output
Feature Descriptions
Overcurrent Protection
80
70
2x10uF Ext Cap
2x47uF Ext Cap
4x47uF Ext Cap
8x47uF Ext Cap
Ripple (mVp-p)
60
50
40
30
20
10
0
0.6
To provide protection in a fault (output overload)
condition, the unit should be 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 should operate
normally once the output current is brought back into its
specified range.
VIN+
MODULE
R1
PWM Enable
I
ON/OFF
0.8
1
1.2
1.4
1.6
1.8
2
Output Voltage(Volts)
Figure 23. Output ripple voltage for various output
voltages with external 2x10 µF, 2x47 µF, 4x47 µF or
8x47 µF ceramic capacitors at the output (50A load).
Input voltage is 12V.
ON/OFF
+
V
ON/OFF
Q1
5.11K
5.11K
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards,
i.e., UL 60950-1 2nd, CSA C22.2 No. 60950-1-07, DIN
EN 60950-1:2006 + A11 (VDE0805 Teil 1 + A11):2009-
11; EN 60950-1:2006 + A11:2009-03.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power module
has extra-low voltage (ELV) outputs when all inputs are
ELV. The input to these units is to be provided with a
surface mount, fast acting fuse (ie. Littelfuse 456030
series) with a maximum rating of 30A in the positive input
lead.
GND
_
Figure 24. Remote On/Off Implementation
using ON/OFF .
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
o
shutdown if the overtemperature threshold of 125 C is
exceeded at the thermal reference point T
ref
. 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.
Remote On/Off
The GigaTLynx
TM
SMT power modules feature a On/Off
pin for remote On/Off operation. If not using the On/Off
pin, connect the pin to ground (the module will be ON).
The On/Off signal (V
on/off
) is referenced to ground. The
circuit configuration for remote On/Off operation of the
module using the On/Off pin is shown in Figure 24.
During a Logic High on the On/Off pin (transistor Q1 is
OFF), the module remains OFF. The external resistor R1
should be chosen to maintain 3.0V minimum on the
On/Off pin to ensure that the module is OFF when
transistor Q1 is in the OFF state. Suitable values for R1
are 4.7K for input voltage of 12V and 3K for 5Vin. During
Logic-Low when Q1 is turned ON, the module is turned
ON.
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).
LINEAGE
POWER
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, module operation will be disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Output Voltage Programming
The output voltage of the GigaTLynx
TM
can be
programmable to any voltage from 0.7 Vdc to 2.0Vdc by
connecting a single resistor (shown as Rtrim in Figure 25)
between the TRIM+ and TRIM pins of the module. The
following equation will be used to set the output voltage of
the module:
14000
R
trim
=
Ω
Vo
−
0.7
By using a ±0.5% tolerance trim resistor with a TC of
±100ppm, a set point tolerance of ±1.5% can be achieved
as specified in the electrical specification. Table 1
provides Rtrim values required for some common output
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
