GE Industrial Solutions Naos Raptor 40A - Manual (Page 13)

Data Sheet
July 11, 2011 Naos Raptor 40A Non Isolated Power Module:
5 – 13.8Vdc input; 0.6Vdc to 5.0Vdc Output; 40A output current
LINEAGE POWER 13
Power Good
The Naos Raptor 40A 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.
Output Voltage Programming
The output voltage of the Naos Raptor 40A module
can be programmed to any voltage from 0.6Vdc to
5.0Vdc by connecting a resistor between the Trim +
and Trim - 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.
43. The Lower Limit curve shows that for output
voltages of 2.75V and higher, the input needs to be
larger than the minimum of 4.5V.
V
O
(+)
TRIM+
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Vout
TRIM −
Figure 42. Circuit configuration for programming
output voltage using an external resistor.
0
2
4
6
8
10
12
14
16
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Output Voltage (V)
Input V
o
lt
ag
e
(v
)
Fig. 43. Output Voltage vs. Input Voltage Set Point
Area plot showing limits where the output voltage
can be set for different input voltages.
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:
Ω
−
= k
Vo
Rtrim
) 6 . 0 (
2 . 1
Rtrim is the external resistor in kΩ
Vo is the desired output voltage
Table 1 provides Rtrim values required for some
common output voltages.
By using a ±0.1% tolerance trim resistor with a TC of
±25ppm, a set point tolerance of ±0.8% 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.
Note: Vin ≥ 180% of Vout at the module output pin.
Table 1
V
O, set
(V) Rtrim (Ω)
0.6 Open
1.0 3000
1.2 2000
1.5 1333
1.8 1000
2.5 632
3.3 444
5.0 273
Monotonic Start-up and Shutdown
The Naos Raptor 40A modules have monotonic start-
up and shutdown behavior for any combination of
rated input voltage, output current and operating
temperature range.