參數(shù)資料
型號(hào)： 108847245
元件分類： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 21/24頁(yè)
文件大?。?/td> 861K
代理商： 108847245
6
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 Overcurrent Protection/Overtemperature Protection
The module is equipped with internal current limiting circuitry for momentary overloads and short circuits. A sus-
tained overload may cause the internal thermal shutdown circuit to activate. The current limit inception is nominally
7 amperes with the module power semiconductors at rated temperature in a 25 °C ambient environment. Addition-
ally, the module is equipped with the thermal circuitry to safeguard against thermal damage. The thermal circuit
shuts down the module when the case temperature of the top surface of the power semiconductors rises to a max-
imum of 135 °C. Figure 25 provides details on the temperature measuring location for the top surface of the power
semiconductor case. The module will be restored to normal operation when the top surface temperature of the
power semiconductor is taken below 105 °C.
Input/Output Decoupling
An input capacitance of 100
F with an ESR of less than 100 milliohms and at least 1 F ceramic or equivalent is
recommended for the input to the modules. This 100
F capacitor should always be used unless the buss bulk
capacitors are located close to the module. This capacitor provides decoupling in the event of a fault to the module
output. Input voltage should never go below 2.5V or internal protection circuitry may fail to act. To achieve noise lev-
els shown in Figures – 10, one 100
F tantalum capacitor and one 1 F ceramic capacitor are used. 0.75 inches of
0.14 inch wide track (with no ground beneath) is used as an inductor between the input pin of the module and the
decoupling capacitors.
Output decoupling used to achieve noise levels shown in Figures –10 is 1
F. Care should be taken that selected
output decoupling capacitors do not form troublesome L-C resonant networks with track inductance.
1-0251
Figure 1. Input/Output Decoupling Circuit
1-0252
Figure 2. Input Reflected Repple Current Measuring Circuit
Measured with AC Current Probe
CTRL
COM
TRACE L
VRM
VIN
VOUT
VIN
+
–
CBULK
100
F
CDECOUP
1
F
CDECOUP
1
F
TP RIPP
ILOAD
CTRL
COM
250 nH
VRM
VIN
VOUT
VIN
+
–
CBULK
100
F
CDECOUP
1
F
CDECOUP
1
F
INPUT REFLECTED RIPPLE CURRENT
ILOAD
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