QHW100G1 Lineage Power, QHW100G1 Datasheet - Page 11

• Manufacturer Part Number: QHW100G1
• Manufacturer: Lineage Power

April 2008
Feature Descriptions
Output Voltage Set-Point Adjustment (Trim)
(continued)
The voltage between the V
must not exceed the minimum output overvoltage pro-
tection value shown in the Feature Specifications table.
This limit includes any increase in voltage due to
remote-sense compensation and output voltage set-
point adjustment (trim). See Figure 19.
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. Consult the factory if you
need to increase the output voltage more than the
above limitation.
The amount of power delivered by the module is
defined as the voltage at the output terminals multiplied
by the output current. When using remote sense and
trim, the output voltage of the module can be
increased, which at the same output current would
increase the power output of the module. Care should
be taken to ensure that the maximum output power of
the module remains at or below the maximum rated
power.
Figure 20. Circuit Configuration to Decrease
Lineage Power
V
ON/OFF
CASE
V
I
I
(+)
(–)
Output Voltage
SENSE(+)
SENSE(–)
V
V
TRIM
O
O
(+)
(–)
O
dc-dc Converters: 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
(+) and V
(continued)
R
adj-down
O
(–) terminals
R
LOAD
8-748 (F).b
Figure 21. Circuit Configuration to Increase
Output Overvoltage Protection
The output overvoltage protection consists of circuitry
that monitors the voltage on the output terminals. If the
voltage on the output terminals exceeds the overvolt-
age protection threshold, then the module will shut
down and latch off. The overvoltage latch is reset by
either cycling the input power for one second or by tog-
gling the on/off signal for one second. If the auto-restart
option is chosen, the unit will “hiccup” until the tempera-
ture is within specification.
Overtemperature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The cir-
cuit shuts down and latches off the module when the
maximum case temperature is exceeded. The module
can be restarted by cycling the dc input power for at
least one second or by toggling the remote on/off signal
for at least one second. If the auto-restart option is cho-
sen, the unit will “hiccup” until the temperature is within
specification.
Note: The output voltage of this module may be
V
ON/OFF
CASE
V
I
I
(+)
(–)
increased by a maximum of 0.5 V. The 0.5 V is
the combination of both the remote-sense and
the output voltage set-point adjustment (trim).
Do not exceed 3.0 V between the V
V
O
(–) terminals.
Output Voltage
SENSE(+)
SENSE(–)
V
TRIM
V
O
O
(+)
(–)
R
adj-up
O
(+) and
R
LOAD
8-715 (F).b
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