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參數(shù)資料
| 型號： | LUC025F |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 16.5 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 397K |
| 代理商： | LUC025F |
8
Lineage Power
Data Sheet
April 2008
18 Vdc to 36 Vdc In; 3.3 Vdc Out; 16.5 W
LUC025F Power Module: dc-dc Converter:
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment
(Trim)
Output voltage adjustment (trim) allows the user to
increase or decrease the output voltage set point of a
module. This is accomplished by connecting an exter-
nal resistor between the TRIM pin and either the VO(+)
or VO(–) pin.
Connecting an external resistor between the TRIM pin
and VO(–) pin (Radj-down) decreases the output voltage
set point (see Figure 11). In order to maintain the out-
put voltage accuracy, the trim resistor tolerance should
be ±0.1%.
8-715(C).h
Figure 11. Circuit Configuration to Decrease
Output Voltage
The relationship between the output voltage and the
trim resistor value for a
Δ% reduction in output voltage
is:
Connecting an external resistor between the TRIM pin
and VO(+) pin (Radj-up) increases the output voltage set
point (see Figure 12).
The relationship between the output voltage and the
trim resistor value for a
Δ% increase in output voltage
is:
8-715(C).g
Figure 12. Circuit Configuration to Increase
Output Voltage
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. This con-
trol loop of the protection circuit has a higher voltage
set point than the primary loop (see Table 5. Feature
Specifications). In a fault condition, the overvoltage
clamp ensures that the output voltage does not exceed
VO, clamp, max. This provides a redundant voltage-con-
trol that reduces the risk of output overvoltage.
Overtemperature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The cir-
cuit shuts down the module when the maximum Tref
temperature is exceeded. The module will automati-
cally restart when the Tref temperature cools suffi-
ciently.
Thermal Considerations
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 is removed by convection and radiation to the sur-
rounding environment.
Considerations include ambient temperature, amount
of airflow, module power dissipation, and need for
increased reliability.
VI(+)
ON/OFF
VI(-)
VO(-)
TRIM
VO(+)
RADJ-DOWN
RLOAD
CASE
Radj-down
511
Δ%
----------6.11
–
kΩ
=
Radj-up
VO 5.11
() 100 Δ%
+
()
1.225
Δ%
--------------------------------------------------------------
511
Δ%
----------
–
6.11
–
kΩ
=
VI(+)
ON/OFF
CASE
VI(-)
VO(+)
TRIM
VO(-)
RADJ-UP
RLOAD
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