GE Industrial Solutions Naos Raptor 20A - Manual (Page 14)

Data Sheet
July 11, 2011 Naos Raptor 20A: Non Isolated Power Module:
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 20A output current
LINEAGE POWER 14
Feature Descriptions (continued)
Power Good
The Naos Raptor 20A 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-temperature, 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 20A module can
be programmed to any voltage from 0.59Vdc to 6Vdc 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. 48. 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.
0
2
4
6
8
10
12
14
16
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Output Voltage (V)
Inpu
t V
o
lt
age
(
v
)
Figure 48. 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 0.59Vdc. To
calculate the value of the trim resistor, Rtrim for a desired
output voltage, use the following equation:
( )
Ω
−
= k
Vo
Rtrim
591 . 0
182 . 1
Rtrim is the external resistor in kΩ
Vo is the desired output voltage
Table 2 provides Rtrim values required for some common
output voltages.
Table 2
V
O, set
(V) Rtrim (KΩ)
0.59 Open
1.0 2.89
1.2 1.941
1.5 1.3
1.8 0.978
2.5 0.619
3.3 0.436
5.0 0.268
6.0 0.219
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.
Note: Vin ≥ 130% of Vout at the module output pin.
V
O
(+)
TRIM+
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Vout
TRIM −
Figure 49. Circuit configuration for programming
output voltage using an external resistor.
Voltage Margining
Output voltage margining can be implemented in the
Naos Raptor 20A modules by connecting a resistor,
R
margin-up
, from the Trim+ pin to the Trim– pin for
margining-up the output voltage and by connecting a
resistor, R
margin-down
, from the Trim+ pin to the output pin
for margining-down. Figure 50 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 R
margin-up
and R
margin-down
for a specific output
voltage and % margin. Please consult your local Lineage
Power technical representative for additional details.