NSR050A0X432Z Datasheet, PDF (10/15 Pages) Lineage Power Corporation – Naos Raptor 50A: Non-Isolated Power Modules

Data Sheet
February 3, 2010
Naos Raptor 50A: Non Isolated Power Module:
5 – 14Vdc input; 0.6Vdc to 2.0Vdc Output; 50A output current
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Output Voltage Programming
The output voltage of the Naos Raptor 50A module
can be programmed to any voltage from 0.6Vdc to
2.0Vdc by connecting a resistor between the Trim +
and Trim - pins of the module. Without an external
resistor between Trim + and Trim - 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:
Rtrim
=
1.2
(Vo − 0.6)
kΩ
Rtrim is the external resistor in kΩ
Vo is the desired output voltage
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
VO, set (V)
0.6
0.8
1.0
1.2
1.5
1.8
Rtrim (KΩ)
Open
6.00
3.00
2.00
1.333
1.000
By using a ±0.1% tolerance trim resistor with a TC of
±25ppm, a set point tolerance of ±1% 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_IN(+)
V_O(+)
Vout
ON/OFF
TRIM+
TRIM−
GND
R_trim
LOAD
Figure 24. Circuit configuration for programming
output voltage using an external resistor.
Power Good
The Naos Raptor 50A power modules provide a
Power Good Status signal that indicates whether or
not the power module is functioning properly.
PwGood is a power good signal implemented with an
open-collector output to indicate that the output
voltage is within the regulation limits of the power
module. The PwGood signal will be de-asserted to a
low state If any condition such as over-current, or
over-voltage occurs which would result in the output
voltage going out of range.
Monotonic Start-up and Shutdown
The Naos Raptor 50A modules have monotonic start-
up and shutdown behavior for any combination of
rated input voltage, output current and operating
temperature range.
Tunable Loop
The Naos Raptor 50A modules have a new feature
that optimizes transient response of the module called
Tunable Loop. External capacitors are usually added
to improve output voltage transient response due to
load current changes. Sensitive loads may also
require additional output capacitance to reduce output
ripple and noise. Adding external capacitance
however affects the voltage control loop of the
module, typically causing the loop to slow down with
sluggish response. Larger values of external
capacitance could also cause the module to become
unstable.
To use the additional external capacitors in an optimal
manner, the Tunable Loop feature allows the loop to
be tuned externally by connecting a series R-C
between the SENSE and TRIM pins of the module, as
shown in Fig. 25. This R-C allows the user to
externally adjust the voltage loop feedback
compensation of the module to match the filter
network connected to the output of the module.
Recommended values of RTUNE and CTUNE are given
in Tables 2 and 3. Table 2 lists recommended values
of RTUNE and CTUNE in order to meet 2% output
voltage deviation limits for some common output
voltages in the presence of a 25A to 50A step change
(50% of full load), with an input voltage of 12V. Table
3 shows the recommended values of RTUNE and CTUNE
for different values of ceramic output capacitors up to
1000uF, again for an input voltage of 12V. The value
of RTUNE should never be lower than the values shown
in Tables 2 and 3. Please contact your Lineage Power
technical representative to obtain more details of this
feature as well as for guidelines on how to select the
right value of external R-C to tune the module for best
transient performance and stable operation for other
output capacitance values.
LINEAGE POWER
10