Data Sheet
Naos Raptor 6A: Non-isolated DC-DC Power Modules
December 6, 2010
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 6A output current
Feature Descriptions
Feature Descriptions (continued)
Remote On/Off
Output Voltage Programming
The Naos Raptor 6A modules feature an On/Off pin with
positive logic for remote On/Off operation. If the On/Off
pin is not being used, leave the pin open (the module
will be ON, except for the -49 option modules where
leaving the pin open will cause the module to remain
OFF). The On/Off signal (VOn/Off) is referenced to
ground. During a Logic High on the On/Off pin, the
module remains ON. During Logic-Low, the module is
turned OFF.
The output voltage of the Naos Raptor 6A module can
be programmed to any voltage from 0.59dc to 6Vdc by
connecting a resistor between the Trim+ and GND pins
of the module. Certain restrictions apply on the output
voltage set point depending on the input voltage. These
are shown in the Output Voltage vs. Input Voltage Set
Point Area plot in Fig. 49. The Upper Limit curve shows
that for output voltages of 0.9V and lower, the input
voltage must be lower than the maximum of 14V. The
Lower Limit curve shows that for output voltages of 3.8V
and higher, the input voltage needs to be larger than the
minimum of 4.5V.
MODULE
VIN
16
14
10K
30.1K
12
R1
100K
Upper Limit
ENABLE
10
8
6
4
2.2K
2.2K
ON/OFF
47K
47K
Lower Limit
2
GND
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Figure 48. Remote On/Off Implementation. Resistor
R1 is absent in the -49Z option module.
Output Voltage (V)
Figure 49. Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
Without an external resistor between Trim+ and GND
pins, the output of the module will be 0.59Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its specified
range. The average output current during hiccup is 10%
1.182
Rtrim =
kΩ
IO, max
.
(
Vo − 0.591
)
Rtrim is the external resistor in kΩ
Overtemperature Protection
Vo is the desired output voltage
To provide protection in a fault condition, these modules
are equipped with a thermal shutdown circuit. The unit
will shut down if the overtemperature threshold of 130ºC
is exceeded at the thermal reference point Tref. The
thermal shutdown is not intended as a guarantee that
the unit will survive temperatures beyond its rating.
Once the unit goes into thermal shutdown it will then
wait to cool before attempting to restart.
Table 2 provides Rtrim values required for some
common output voltages.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
LINEAGE POWER
14
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
