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| 型號(hào)： | QW030A1 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 373K |
| 代理商： | QW030A1 |
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Lucent Technologies Inc.
9
Advance Data Sheet
September 2000
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs
QC/QW030-Series Power Modules: dc-dc Converters;
Feature Descriptions
(continued)
Output Voltage Set-Point Adjustment
(Trim)
(continued)
The following equation determines the required exter-
nal-resistor value to obtain a change in output voltage
from V
O, nom
to V
O, adj
. The values of G, H, K, and L are
shown in Table 5.
Table 5. Values for Trim Equations
The voltage between the V
O
(+) and V
O
(–) terminals
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 5.
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 your Lucent Technol-
ogies Account Manager or Application Engineer if the
output voltage needs to be increased 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.
8-715(C).i
Figure 6. QC/QW030-Series Circuit Configuration
to Decrease Output Voltage
8-748(C).f
Figure 7. QC/QW030-Series Circuit Configuration
to Increase 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.
Device
Suffix
F
A
B
C
V
o, nom
G
H
K
L
3.3
5
12
15
5110
5110
10,000
10,000
3010
3010
3010
3010
2.06
2.5
9.5
12.5
1.24
2.5
2.5
2.5
R
adj-up
GL
–
V
O adj
,
L
(
)
K
–
[
]
----------------------------------------
H
–
=
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-down
R
LOAD
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-up
R
LOAD
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