Feature descriptions, Thermal considerations, Output voltage set-point adjustment (trim) – GE Industrial Solutions QW030xx DUAL Series User Manual
Page 10: Output overvoltage protection, Overtemperature protection, Input undervoltage lockout, Introduction
10
Lineage Power
Data Sheet
October 2
00
8
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs
QW030xx DUAL Series Power Modules: dc-dc Converters;
.
Feature Descriptions
(continued)
Output Voltage Set-Point Adjustment
(Trim)
(continued)
8-715.vf
Figure
6
.
QW030-Series Circuit Configuration to
Decrease Output Voltage
Output Overvoltage Protection
The output overvoltage clamp consists of control
circuitry, independent of the primary regulation loop,
that monitors the voltage on the output terminals. This
control loop has a higher voltage set point than the
primary loop (see the Feature Specifications table). In
a fault condition, the overvoltage clamp ensures that
the output voltage does not exceed V
O
,
clamp
,
max
. This
provides a redundant voltage-control that reduces the
risk of output overvoltage.
Overtemperature Protection
These modules feature overtemperature protection to
safeguard the modules against thermal damage.
When the temperature exceeds the overtemperature
threshold given in the feature specifications table, the
module will limit the available output current in order to
help protect against thermal damage. The overcurrent
inception point will gradually move back to its original
level as the module is cooled below the overtempera-
ture threshold.
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 between the under-
voltage lockout limit and the minimum operating input
voltage.
Thermal Considerations
Introduction
The power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation of the unit.
Heat-dissipating components inside the unit are ther-
mally coupled to the case. Heat is removed by conduc-
tion, convection, and radiation to the surrounding
environment. Proper cooling can be verified by mea-
suring the case temperature. The case temperature
should be measured at the position indicated in
Figure
8-2104.a
Note: Top view, pin locations are for reference only.
Measurements shown in millimeters and (inches).
Figure
7
.
QW030-Series Case Temperature
Measurement Location
The temperature at this location should not exceed
105 °C. The output power of the module should not
exceed the rated power for the module as listed in the
Ordering Information table.
Although the maximum case temperature of the power
modules is 105 °C, you can limit this temperature to a
lower value for extremely high reliability.
V
I
(+)
V
I
(-)
ON/OFF
(+)
V
O
2(-)
TRIM
COM
R
adj-down
R
LOAD1
V
01
R
LOAD2
14
(0.55)
V
I
(-)
ON/OFF
V
I
(+)
(-)
TRIM
(+)
33 (1.30)
V
01
COM
V
02
NC