Data Sheet
March 26, 2008
EUK240 Series Power Modules; DC-DC converters
36 – 60Vdc input; 9.6Vdc Output; 240W
Input Under-voltage Lockout
At input voltages below the input under voltage
lockout limit, the module operation is disabled. The
module will begin to operate at an input voltage above
the under voltage lockout turn-on threshold.
Feature Description
Remote On/Off
Two remote on/off options are available. Positive logic
remote on/off turns the module on during a logic-high
voltage on the ON/OFF pin, and off during logic low.
Negative logic remote on/off turns the module off
during a logic high and on during a logic low. Negative
logic, device code suffix "1," is the factory-preferred
configuration. To turn the power module on and off,
the user must supply a switch to control the voltage
between the on/off terminal and the VI (-) terminal
(Von/off). The switch can be an open collector or
equivalent (see Figure 16). A logic low is Von/off =
-0.3 V to 0.8 V. The maximum Ion/off during a logic
low is 10 mA. The switch should maintain a logic-low
voltage while sinking 10 mA. During logic high, the
maximum Von/off generated by the power module is
4.7 V. The maximum allowable leakage current of the
switch at Von/off = 2.0V is 0.7 mA. If not using the
remote on/off feature, perform one of the following to
turn the unit on:
For negative logic, short ON/OFF pin to VI(-).
For positive logic: leave ON/OFF pin open.
I
on/off
+
V
on/off
–
V
O
(+)
LOAD
V
I
(+)
V
I
(–)
V
O
(–)
Over-temperature Protection
These modules feature an over-temperature
protection circuit to safeguard against thermal
damage. The protection circuit shuts down the
module when the maximum device reference
temperature is exceeded. When the module cools
down and the reference device temperature falls
below the recovery threshold, the module will resume
operation.
Over-voltage Protection
The input/output over-voltage protection circuit is
designed to shut down the module when the input
voltage exceeds the over-voltage threshold. The
module will resume operation when the input voltage
enters the normal input operating range
Short Circuit Protection
The power modules shall sustain no damage when
subjected to a short circuit of any duration on its
output. The output of the module shall recover
automatically in a hiccup (auto-restart) manner
identical to that described in the over-current
protection section.
ON/OFF
Pre-Bias Immunity
The startup/shutdown characteristics of the module
accommodates external voltage source clamping on
the output via external diodes without exhibiting non-
monotonic startup (See figure 17). The monotonic
startup of the module will not be affected by the
customer application of the pre-biasing of the output.
During shutdown an internal feature implemented in
the module ensures there will be no reverse current.
During Hiccup operation, the reverse current
protection will be enabled.
Vout
Module
L
O
A
D
Vs
Figure 16. Circuit configuration for using Remote
On/Off Implementation.
Over-current Protection
To provide protection in an output overload condition,
the module is equipped with internal current-limiting
circuitry and can endure current limiting for unlimited
duration. If the output current exceeds the current limit
inception value, the module enters into the hiccup
(auto-restart) mode operation, where it shuts down
and automatically attempts to restart. As long as the
fault condition exists, the module will remain in this
hiccup mode, and can sustain this mode of operation
until the over-current fault condition is corrected.
Figure 17. Pre-bias immunity configuration.
LINEAGE
POWER
8
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
