GE Industrial Solutions TLynx - Manual (Page 14)

Data Sheet
August 13, 2013 TLynx TM : Non-isolated DC-DC Power Modules:
2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 20A output current
LINEAGE POWER 14
0
1
2
3
4
5
6
0.5 1 1.5 2 2.5 3 3.5 4
Output Voltage (V)
In
p
u
t V
o
lt
ag
e (
v)
Upper Limit
Lower Limit
Figure 40. Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
Without an external resistor between Trim+ and GND
pins, the output of the module will be 0.6Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
( )
Ω






−
= k
Vo
Rtrim
6 . 0
2 . 1
Rtrim is the external resistor in kΩ, and Vo is the desired
output voltage.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
V
O, set
(V) Rtrim (KΩ)
0.6 Open
1.0 3.0
1.2 2.0
1.5 1.333
1.8 1.0
2.5 0.632
3.3 0.444
By using a ±0.5% tolerance trim resistor with a TC of
±25ppm, a set point tolerance of ±1.5% can be achieved
as specified in the electrical specification. The POL
Programming Tool available at
www.lineagepower.com
under the Design Tools section, helps determine the
required trim resistor needed for a specific output
voltage.
V
O
+
TRIM
GND
R
trim
LOAD
V
IN
+
ON/OFF
SENSE
Figure 41. Circuit configuration for programming
output voltage using an external resistor.
Remote Sense
The TLynx TM modules have a Remote Sense feature to
minimize the effects of distribution losses by regulating
the voltage at the SENSE pin. The voltage between the
SENSE pin and VOUT pin must not exceed 0.5V. Note
that the output voltage of the module cannot exceed the
specified maximum value. This includes the voltage
drop between the SENSE and Vout pins. When the
Remote Sense feature is not being used, connect the
SENSE pin to the VOUT pin.
Voltage Margining
Output voltage margining can be implemented in the
TLynx
TM modules by connecting a resistor, R
margin-up
,
from the Trim pin to the ground pin for margining-up the
output voltage and by connecting a resistor, R
margin-down
,
from the Trim pin to output pin for margining-down.
Figure 5 shows the circuit configuration for output
voltage margining. The POL Programming Tool,
available at
www.lineagepower.com under the Design
Tools section, also calculates the values of R
margin-up
and
R
margin-down
for a specific output voltage and % margin
Please consult your local Lineage Power technical
representative for additional details.