JW150A データシートの表示（PDF） - Tyco Electronics
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JW150A
Tyco Electronics
JW150A Datasheet PDF : 20 Pages
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Data Sheet
July 1999
JW050A, JW075A, JW100A, JW150A Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment (Trim)
Remote Sense
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections. The voltage between the remote-sense
pins and the output terminals must not exceed the out-
put voltage sense range given in the Feature Specifica-
tions table, i.e.:
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value of the output over-
voltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 21.
If not using the remote-sense feature to regulate the
output at the point of load, then connect SENSE(+) to
VO(+) and SENSE(–) to VO(–) at the module.
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 the factory if you
need to increase the output voltage 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.
SENSE(+)
SENSE(–)
SUPPLY II
CONTACT
RESISTANCE
VI(+)
VI(–)
VO(+)
VO(–)
IO
LOAD
CONTACT AND
DISTRIBUTION LOSSES
8-651 (C).m
Figure 21. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Output voltage trim allows the user to increase or
decrease the output voltage set point of a module. This
is accomplished by connecting an external resistor
between the TRIM pin and either the SENSE(+) or
SENSE(–) pins. The trim resistor should be positioned
close to the module.
If not using the trim feature, leave the TRIM pin open.
With an external resistor between the TRIM and
SENSE(–) pins (Radj-down), the output voltage set point
(VO, adj) decreases (see Figure 22). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of ∆%.
R adj-down
=
100
-∆----%----
–
2
kΩ
The test results for this configuration are displayed in
Figure 23. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (Radj-up), the output voltage set
point (VO, adj) increases (see Figure 24).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of ∆%.
R adj-up
=
VO(100 + ∆%)
-------1----.-2----2---5----∆----%-----------
–
(---1---0----0---∆-+---%---2---∆----%------)
kΩ
The test results for this configuration are displayed in
Figure 25.
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value of the output over-
voltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 21.
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 the factory if you
need to increase the output voltage 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.
Tyco Electronics Corp
11
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