GE Industrial Solutions 9-36V ProLynx 5A - Manual (Page 12)

GE Data Sheet
9-36V ProLynx TM 5A: Non-Isolated DC-DC Power Modules
9Vdc –36Vdc input; 3Vdc to 18Vdc output; 5A to 2.5A Scaled output current
9Vdc –24Vdc input; -3.3Vdc to -18Vdc output; 5A to 0.7A Scaled output current
July 23, 2013 ©2012 General Electric Company. All rights reserved. Page 12
Feature Descriptions
Remote Enable
The 9-36V ProLynx TM 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 positive logic modules, the circuit configuration for using
the On/Off pin is shown in Figure 32. When the external
transistor Q1 is in the OFF state, the ON/OFF pin is pulled high
and transistor Q2 is OFF leading to Q3 also being OFF which
turns the module ON. The external resistor R
pullup
(100k
recommended) must be sized so that V
ON/OFF
is never more
than 12V when Q1 is OFF. In particular, if V
pullup
is made the
same as the input voltage Vin, the resistor R
pullup
must be large
enough so that V
ON/OFF
is never more than 12V. If the On/Off pin
is left floating the module will be in the ON state.
For negative logic On/Off modules, the circuit configuration is
shown in Fig. 33. When the external transistor Q1 is in the ON
state, the ON/OFF pin is pulled low causing transistor Q2 to be
OFF and the module to be turned ON. To turn the module OFF,
Q1 is turned OFF, causing the ON/OFF pin to be pulled high
turning Q2 ON and the module to be turned OFF. If the On/Off
pin is left floating, the module will be in the OFF state.
Figure 32. Circuit configuration for using positive On/Off
logic.
Figure 33. 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. The 9-36V ProLynx modules employ an
innovative, patent pending, ‘AutoLimit’ capability. This results in
automatic scaling of current limit with output voltage through
an inverse relationship of the current limit threshold with the
output voltage. This feature shown graphically in Fig. 34, allows
higher output currents to be drawn from the module at lower
output voltages thereby optimizing the power delivery
capability of the module.
Figure 34. Graph showing maximum output current
capability at different output voltages.
Over Temperature 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 130
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.
22K
I
ON/OFF
CSS Q1
GND
ON/OFF
Vpullup
_
+
PWM Enable
V
ON/OFF
MODULE
Rpullup
22K
Q3
42K
Q2
22K
+5V
ISS
ISS
ON/OFF
I
CSS Q1
ON/OFF
VIN+
GND _
+
V
Rpullup
22K
Q2
22K
D1
ON/OFF
MODULE
PWM Enable
22K
22K
D2
+5V
2
2.5
3
3.5
4
4.5
5
5.5
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
O
u
tp
ut
C
u
rr
e
nt
(A
)
Output Voltage (V)