參數(shù)資料
型號(hào): 108847245
元件分類(lèi): 電源模塊
英文描述: 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù): 19/24頁(yè)
文件大小: 861K
代理商: 108847245
4
Tyco Electronics Corp.
Data Sheet
June 2001
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Austin Lite Non-Isolated SMT DC - DC Power Modules:
Output Control (continued)
Margin Down (continued)
Example: To margin down 5%, then:
RMARGIN = 9481
Because margining affects the system reference, margining beyond 10% is unacceptable and 0% - 5% is desirable.
Margining the unit down beyond 5% requires derating the available current by 1% for every percent beyond 5 that
the module is margined down. For example, if a module were margined down 7%, output current would have to be
derated 2%.
Special Note:The 3.3/2.5V version must be operated at nominal line to achieve margin up.
The margin up available for this version is maximum 5%
Output Regulation
These modules make use of inherent output resistance to facilitate improved transient response. This means that
the output voltage will decrease with increasing output current. For this reason, the total DC regulation window at
any given operating temperature is comprised of a no-load setpoint and a load dependent voltage drop due to mod-
ule output resistance. Regulation data provided in Table 2 includes both the initial set point and this voltage drop.
Because Table 2 includes output resistance drop, the maximum column represents a no-load condition while the
minimum column represents a full-load condition. Production test limits are set such that no module could pass
with a full-load regulation point equal to the maximum column. This means that at any operating current, the regu-
lation will always be better than the total window specified in Table 2.
499
1 – margin%
1 – (1 – margin%)
-----------------------------------------------
RMARGIN =
499
1 – .05
1 – (1 – .05)
--------------------------------
RMARGIN =
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