APTH012A0X_10 Datasheet, PDF (14/23 Pages) Lineage Power Corporation – Micro TLynxTM: Non-Isolated DC-DC Power Modules

Data Sheet
April 7, 2011
Micro TLynx^TM: Non-isolated DC-DC Power Modules:
2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Rtrim = _{(Vo}¹_−^.20.6_{)}kΩ
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
VO, set (V)
0.6
1.0
1.2
1.5
1.8
2.5
3.3
Rtrim (KΩ)
Open
3.0
2.0
1.333
1.0
0.632
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_{I N}+
ON/OFF
VO+
SENSE
TRIM
LOAD
Rtr im
GND
Figure 41. Circuit configuration for programming
output voltage using an external resistor.
Remote Sense
The Micro 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
Micro TLynx^TM 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 42 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 Rmargin-up and
Rmargin-down for a specific output voltage and % margin
Please consult your local Lineage Power technical
representative for additional details.
Vo
MODULE
Rmargin-down
Q2
Trim
Rmargin-up
Rtrim
Q1
GND
Figure 42. Circuit Configuration for margining
Output voltage
Monotonic Start-up and Shutdown
The Micro TLynx^TM modules have monotonic start-up
and shutdown behavior for any combination of rated
input voltage, output current and operating temperature
range.
Startup into Pre-biased Output
The 5.5V Pico 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.
Output Voltage Sequencing
The APTH012A0X 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.
LINEAGE POWER
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