Lineage Power 9
Data Sheet
April 2008 dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
QHW050G1, QHW075G1, and QHW100G1 Power Modules;
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power mod-
ule. For the test configuration in Figure 15, a 33 µF
electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)
mounted close to the power module helps ensure sta-
bility of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standard,
i.e., UL60950, CSA C22.2 No. 60950-00, and VDE
0805 (IEC60950).
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75 Vdc), for the module’s output to be considered
meeting the requirements of safety extra-low voltage
(SELV), all of the following must be true:
nThe input source is to be provided with reinforced
insulation from any hazardous voltages, including the
ac mains.
nOne VI pin and one VO pin are to be grounded, or
both the input and output pins are to be kept floating.
nThe input pins of the module are not operator acces-
sible.
nAnother SELV reliability test is conducted on the
whole system, as required by the safety agencies, on
the combination of supply source and the subject
module to verify that under a single fault, hazardous
voltages do not appear at the module’s output.
Note: Do not ground either of the input pins of the
module without grounding one of the output pins.
This may allow a non-SELV voltage to appear
between the output pin and ground.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 20 A normal-blow fuse in the ungrounded lead.
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and can endure current limiting for up to one
second. If overcurrent exists for more than one second,
the unit will shut down.
At the point of current-limit inception, the unit shifts
from voltage control to current control. If the output volt-
age is pulled very low during a severe fault, the current-
limit circuit can exhibit either foldback or tailout charac-
teristics (output current decrease or increase).
The module is available in two overcurrent configura-
tions. In one configuration, when the unit shuts down it
will latch off. The overcurrent latch is reset by either
cycling the input power or by toggling the ON/OFF pin
for one second. In the other configuration, the unit will
try to restart after shutdown. If the output overload con-
dition still exists when the unit restarts, it will shut down
again. This operation will continue indefinitely until the
overcurrent condition is corrected.
Remote On/Off
Negative logic remote on/off turns the module off dur-
ing a logic high and on during a logic low. To turn the
power module on and off, the user must supply a
switch to control the voltage between the on/off termi-
nal and the VI(–) terminal (Von/off). The switch can be an
open collector or equivalent (see Figure 18). A logic
low is Von/off = 0 V to 1.2 V. The maximum Ion/off during a
logic low is 1 mA. The switch should maintain a logic-
low voltage while sinking 1 mA.
During a logic high, the maximum Von/off generated by
the power module is 15 V. The maximum allowable
leakage current of the switch at Von/off = 15 V is 50 µA.
If not using the remote on/off feature, short the ON/OFF
pin to VI(–).