Data Sheet
12V Micro TLynxTM: Non-isolated DC-DC Power Modules
September 8, 2009
4.5 – 14Vdc input; 0.69Vdc to 5.5Vdc output; 12A output current
16
14
12
10
8
VIN(+)
VO(+)
VS+
Upper Limit
ON/OFF
LOAD
TRIM
6
Rtri m
4
Lower Limit
GND
2
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Figure 45. Circuit configuration for programming
output voltage using an external resistor.
Output Voltage (V)
Figure 44. Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
Startup into Pre-biased Output
The 12V Micro TLynxTM 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.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
VO, set (V)
0.7
Rtrim (KΩ)
690
Voltage Margining
Output voltage margining can be implemented in the
12V Micro TLynxTM modules by connecting a resistor,
Rmargin-up, from the Trim pin to the ground pin for
margining-up the output voltage and by connecting a
resistor, Rmargin-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 Rmargin-up and Rmargin-down for a specific output
voltage and % margin Please consult your local Lineage
Power technical representative for additional details.
1.0
1.2
1.5
1.8
2.5
3.3
5.0
22.26
13.53
8.519
6.216
3.812
2.644
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.
Output Voltage Sequencing
Remote Sense
The 12V Micro TLynxTM 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 VIN or
leave it unconnected.
The 12V Micro TLynxTM 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.
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.
Monotonic Start-up and Shutdown
The 12V Micro TLynxTM modules have monotonic start-
up and shutdown behavior for any combination of rated
input voltage, output current and operating temperature
range.
LINEAGE POWER
16
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
