GE Industrial Solutions 2A DLynx - Manual (Page 14)

GE Energy
Datasheet
2A DLynx TM : Non-Isolated DC-DC Power Modules
3Vdc –14Vdc input; 0.6Vdc to 5.5Vdc output; 2A Output Current
June 24, 2013 ©2012 General Electric Company. All rights reserved. Page 14
Feature Descriptions
Remote Enable
The 12V DLynx TM 2A power modules feature an On/Off pin for
remote On/Off operation. Two On/Off logic options are
available. In the Positive Logic On/Off option, (device code
suffix “4” – see Ordering Information), the module turns ON
during a logic High on the On/Off pin and turns OFF during a
logic Low. With the Negative Logic On/Off option, (no device
code suffix, see Ordering Information), the module turns OFF
during logic High and ON during logic Low. The On/Off signal is
always referenced to ground. For either On/Off logic option,
leaving the On/Off pin disconnected will turn the module ON
when input voltage is present.
For positive logic modules, the circuit configuration for using
the On/Off pin is shown in Figure 43. Contact GE Energy
regarding availability of positive logic module
Q1
VIN+
GND
+
PWM Enable
ON/OFF
V
ON/OFF
_
MODULE
I
Rpullup
ON/OFF
10K
Q2
10K
50K
50K
Q3
10K
10K
Figure 43. Circuit configuration for using positive On/Off
logic.
For negative logic On/Off modules, the circuit configuration is
shown in Fig. 44.
Q1
ON/OFF
VIN+
GND
+
PWM Enable
V
ON/OFF
_
MODULE
I
Rpullup
ON/OFF
10K
Q2
10K
Figure 44. Circuit configuration for using negative On/Off
logic.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
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.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shutdown if the overtemperature threshold of 140
o C is
exceeded at the thermal reference point T
ref
. 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.
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.
Output Voltage Programming
The output voltage of the 12V DLynx TM 2A modules can
be programmed to any voltage from 0.6dc to 5.5Vdc 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. 45. The Lower Limit curve shows
that for output voltages of 2.4V and higher, the input
voltage needs to be larger than the minimum of 3V.
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)
In
p
u
t V
o
lt
ag
e
(v
)
Figure 45. 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 GND 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: