GE Industrial Solutions 12V MicroTLynx 12A - Manual (Page 16)

GE
Data Sheet
12V MicroTLynx TM 12A: Non-Isolated DC-DC Power Modules
4.5Vdc –14Vdc input; 0.69Vdc to 5.5Vdc output; 12A Output Current
May 2, 2013 ©2013 General Electric Company. All rights reserved. Page 16
Figure 44. Output Voltage vs. Input Voltage Set Point Area
plot showing limits where the output voltage can be set for
different input voltages.
Table 1 provides Rtrim values required for some common
output voltages.
Table 1
V
O, set
(V) Rtrim (KΩ)
0.7 690
1.0 22.26
1.2 13.53
1.5 8.519
1.8 6.216
2.5 3.812
3.3 2.644
5.0 1.601
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.
Remote Sense
The 12V Micro TLynx TM power modules have a Remote Sense
feature to minimize the effects of distribution losses by
regulating the voltage between the VS+ and VS– pins. The
voltage between the VS– and GND pins of the module must not
drop below –0.2V. If Remote Sense is being used, the voltage
between VS+ and VS– cannot be more than 0.5V larger than
the voltage between VOUT and GND. Note that the output
voltage of the module cannot exceed the specified maximum
value. When the Remote Sense feature is not being used,
connect the VS+ pin to the VOUT pin and the VS– pin to the
GND pin.
Monotonic Start-up and Shutdown
The 12V Micro TLynx TM modules have monotonic start-up and
shutdown behavior for any combination of rated input voltage,
output current and operating temperature range.
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
VS+
Figure 45. Circuit configuration for programming output
voltage using an external resistor.
Startup into Pre-biased Output
The 12V Micro TLynx TM 12A modules can start into a prebiased
output as long as the prebias voltage is 0.5V less than the set
output voltage. Note that prebias operation is not supported
when output voltage sequencing is used.
Voltage Margining
Output voltage margining can be implemented in the 12V
Micro 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 46 shows the
circuit configuration for output voltage margining. The Lynx
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 GE technical representative for
additional details.
Output Voltage Sequencing
The 12V Micro TLynx TM modules include a sequencing feature,
EZ-SEQUENCE that enables users to implement various types of
output voltage sequencing in their applications. This is
accomplished via an additional sequencing pin. When not
using the sequencing feature, either tie the SEQ pin to V
IN
or
leave it unconnected.
When an analog voltage is applied to the SEQ pin, the output
voltage tracks this voltage until the output reaches the set-
point voltage. The final value of the SEQ voltage must be set
higher than the set-point voltage of the module. The output
voltage follows the voltage on the SEQ pin on a one-to-one volt
basis. By connecting multiple modules together, multiple
modules can track their output voltages to the voltage applied
on the SEQ pin.
0
2
4
6
8
10
12
14
16
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Output Voltage (V)
In
p
u
t V
o
lt
a
g
e
(
v
)
Lower Limit
Upper Limit