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參數(shù)資料
| 型號： | LC020A7 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 437K |
| 代理商： | LC020A7 |
Lineage Power
11
Data Sheet
April 2008
18 Vdc to 36 Vdc Inputs; 20 W
LC020 Single-Output Series Power Module:
Feature Descriptions (continued)
Output Voltage Adjustment (continued)
The adjusted output voltage cannot exceed 110% of
the nominal output voltage between the VO(+) and
VO(–) terminal.
The modules have a fixed current-limit set point. There-
fore, as the output voltage is adjusted down, the avail-
able output power is reduced. In addition, the minimum
output current is a function of the output voltage. As the
output voltage is adjusted down, the minimum required
output current can increase.
Output Overvoltage Protection
The output overvoltage clamp consists of control cir-
cuitry, independent of the primary regulation loop, that
monitors the voltage on the output terminals. The con-
trol loop of the protection circuit has a higher voltage
set point than the primary loop (see Feature Specifica-
tions table).
In a fault condition, the overvoltage clamp ensures that
the output voltage does not exceed VO, clamp, max. This
provides a redundant voltage control that reduces the
risk of output overvoltage.
Synchronization (Optional)
The unit is capable of external synchronization from an
independent time base with a switching rate of
256 kHz. The amplitude of the synchronizing pulse
train is TTL compatible and the duty cycle ranges
between 40% and 60%. Synchronization is referenced
to VIN(+).
Thermal Considerations
Introduction
The LC020 power module operates in a variety of ther-
mal environments; however, sufficient cooling should
be provided to help ensure reliable operation of the
unit. Heat-dissipating components inside the unit are
thermally coupled to the case. Heat is removed by con-
duction, convection, and radiation to the surrounding
environment. Proper cooling can be verified by mea-
suring the case temperature. Peak case temperature
8-1265
Note: Dimensions are in millimeters and (inches).
Figure 20. Case Temperature Measurement
Location
Note that the view in Figure 20 is of the metal surface
of the module—the pin locations shown are for
reference. The temperature at this location should not
exceed 100 °C. The output power of the module should
not exceed the rated power for the module as listed in
the Ordering Information table.
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 21 shows the maximum
power that can be dissipated by the module without
exceeding the maximum case temperature versus local
ambient temperature (TA) for natural convection
through 3.0 ms–1 (600 ft./min.).
Note that the natural convection condition was mea-
sured at 0.05 ms–1 (10 ft./min.) to 0.1 ms–1 (20 ft./min.);
however, 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 dissipat-
ing components in the system. Use of Figure 21 is
shown in the following example.
Example
What is the minimum airflow necessary for an LC020A
operating at high line, an output current of 2.0 A, and a
maximum ambient temperature of 83 °C?
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