参数资料
型号: HW004A0A1
元件分类: 电源模块
英文描述: 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
文件页数: 10/27页
文件大小: 519K
代理商: HW004A0A1
HW/HC 4A – 6A Series Power Modules; dc-dc Converters
18 – 36 Vdc & 36 – 75 Vdc Input; 1.0Vdc to 5Vdc Output
Data Sheet
July 7, 2003
18
Tyco Electronics Power Systems
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment
(Trim)
Trimming allows the output voltage set point to be
increased or decreased, this is accomplished by
connecting an external resistor between the TRIM pin
and either the VO(+) pin or the VO(-) pin (COM pin) .
VO(+)
VOTRIM
COM
Rtrim-down
LOAD
VIN(+)
ON/OFF
VIN(-)
Rtrim-up
Figure 65. Circuit Configuration to Trim Output
Voltage
Connecting an external resistor (Rtrim-down) between the
TRIM pin and the COM pin decreases the output voltage
set point. To maintain set point accuracy, the trim
resistor tolerance should be ±0.1%.
The relationship between the output voltage and the trim
resistor value for a % reduction in output voltage is:
Nominal 5V, 3.3V, 2.5V, 2.0V, 1.8V, & 1.5V modules:
Nominal 1.2V module:
Nominal 1.0V module:
Connecting an external resistor (Rtrim-up) between the
TRIM pin and the VO(+) pin increases the output voltage
set point. To maintain set point accuracy, the trim
resistor tolerance should be ±0.5%.
The relationship between the output voltage and the trim
resistor value for a % increase in output voltage is:
Nominal 5V, 3.3V, 2.5V, 2.0V, 1.8V, & 1.5V modules:
Nominal 1.2V module:
Nominal 1.0V module:
(VO refers to the nominal output voltage, i.e. 5.0V for VO
on an HW004A0A. % is the required % change in
output voltage, i.e. to trim a 5.0V module to 5.10V the
% value is 2).
Examples:
To trim down the output of a nominal 5.0V module
(HW004A0A) to 4.90V
% = 2
Rtrim-down = 249.39 k
To trim up the output of a nominal 3.3V module
(HW005A0F) to 3.63V
% = 10
Rtrim-up =94.2 k
Rtrim-down =
- 6.11 k
511
%
Rtrim-down =
- 4.46 k
346
%
Rtrim-down =
- 4.90 k
390
%
Rtrim-up =
-
- 6.11 k
5.11VO(100+%)
1.225
%
511
%
Rtrim-up =
-
- 4.46 k
5.11VO(100+%)
1.225
%
346
%
Rtrim-up =
-
- 6.11 k
5.11x3.3(100+10)
1.225x10
511
10
Rtrim-down =
- 6.11 k
511
2
Rtrim-up =
-
- 4.90 k
5.11VO(100+%)
1.225
%
390
%
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