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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)： | 10/16頁(yè) |
| 文件大?。?/td> | 373K |
| 代理商： | QW030A1 |
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10
Lucent Technologies Inc.
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)
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.
8-2104(C).a
Note: Top view, pin locations are for reference only.
Measurements shown in millimeters and (inches).
Figure 8. QC/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.
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figures 9 and 10 show the
maximum power that can be dissipated by the module
without exceeding the maximum case temperature ver-
sus local ambient temperature (T
A
) for natural convec-
tion through 3 m/s (600 ft./min.).
Systems in which these power modules may be used
typically generate natural convection airflow rates of
0.3 ms
–1
(60 ft./min.) due to other heat-dissipating
components in the system. Therefore, the natural con-
vection condition represents airflow rates of up to
0.3 ms
–1
(60 ft./min.). Use of Figure 9 is shown in the
following example.
Example
What is the minimum airflow necessary for a QW030A
operating at V
I
= 48 V, an output current of 3.5 A, and a
maximum ambient temperature of 89 °C
Solution
Given: V
I
= 48 V
I
O
= 3.5 A
T
A
= 89 °C
Determine P
D
(Use Figure 12.):
P
D
= 3 W
Determine airflow (v) (Use Figure 9.):
v = 1.0 m/s (200 ft./min.)
8-3406(F)
Figure 9. QW030A, F Forced Convection Power
Derating with No Heat Sink; Either
Orientation
14
(0.55)
V
I
(–)
ON/OFF
V
I
(+)
V
O
(–)
TRIM
V
O
(+)
(+)SENSE
(–)SENSE
33 (1.30)
7
40
50
60
70
80
90
100
110
6
5
4
3
2
1
0
MAX CASE TEMP.
MAX AMBIENT TEMPERATURE, T
A
(
°
C)
P
D
2.0 ms
-1
(400 ft./min.)
3.0 ms
-1
(600 ft./min.)
1.0 ms
-1
(200 ft./min.)
NATURAL CONVECTION
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