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參數(shù)資料
| 型號： | QW075F1 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 1008K |
| 代理商： | QW075F1 |
10
Lucent Technologies Inc.
Data Sheet
May 2000
dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 50 W
QW050F1 and QW075F1 Power Modules:
Feature Descriptions
(continued)
Remote On/Off
Figure 19. Resistor Selection for Decreased
Output Voltage
(continued)
8-651 (C).m
Figure 17. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Output Voltage Set-Point Adjustment (Trim)
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 (R
adj-down
(V
O, adj
) decreases (see Figure 18). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of
), the output voltage set point
%.
The test results for this configuration are displayed in
Figure 19. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (R
adj-up
), the output voltage set
point (V
O, adj
) increases (see Figure 20).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of
%.
5.1V
100
+
(
%
The test results for this configuration are displayed in
Figure 21.
The voltage between the V
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-
O
(+) and V
O
(–) terminals
point adjustment (trim). See Figure 17.
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.
8-748 (C).b
Figure 18. Circuit Configuration to Decrease
Output Voltage
8-2579 (C)
V
O
(+)
SENSE(+)
SENSE(–)
V
O
(–)
V
I
(+)
V
I
(–)
I
O
LOAD
CONTACT AND
DISTRIBUTION LOSSES
SUPPLY
I
I
CONTACT
RESISTANCE
R
adj-down
510
%
---------
10.2
–
k
=
R
adj-up
%
)
----------1.225
510
---%
–
10.2
–
k
=
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-down
R
LOAD
10
20
30
40
1k
10k
100k
0
1M
A
)
% CHANGE IN OUTPUT VOLTAGE (
%)
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