Electronic Components Datasheet Search |
|
CMPWR280TO Datasheet(PDF) 9 Page - ON Semiconductor |
|
CMPWR280TO Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 11 page CMPWR280 http://onsemi.com 9 TYPICAL THERMAL CHARACTERISTICS Thermal dissipation of junction heat consists primarily of two paths in series. The first path is the junction to the case ( qJC) thermal resistance which is defined by the package style, and the second path is the case to ambient ( qCA) thermal resistance, which is dependent on board layout. The overall junction to ambient ( qJA) thermal resistance is equal to: qJA + qJC ) qCA For a given package style and board layout, the operating junction temperature is a function of junction power dissipation PJUNC, and the ambient temperature, resulting in the following thermal equation: TJUNC + TAMB ) PJUNC(qJC) ) PJUNC(qCA) + TAMB ) PJUNC(qJA) The CMPWR280TO is housed in a TO−263 5−lead package, which provides a qJC of 3C/W. The ground tab is soldered down to the PCB. When the device is mounted on a double−sided printed circuit board with two square inches of copper allocated for “heat spreading”, the resulting qJA is 25C/W. Based on a maximum power dissipation of 2.85 W (1.9 V x 1.5 A) with an ambient of 70C the resulting junction temperature will be: TJUNC + TAMB ) PJUNC(qJA) + 70° C ) 2.85 W (25° C W) + 70° C ) 71° C + 141° C All thermal characteristics of the CMPWR280TO were measured using a double−sided board with two square inches of copper area connected to the GND pins for “heat spreading”. Measurements showing performance up to junction temperature of 125C were performed under light load conditions (5 mA). This allows the ambient temperature to be representative of the internal junction temperature. NOTE: The use of multi−layer board construction with power planes will further enhance the thermal performance of the package. In the event of no copper area being dedicated for heat spreading, a multi−layer board construction will typically provide the CMPWR280TO with an overall qJA of 25C/W which allows up to 2.5 W to be safely dissipated. Output Voltage vs. Temperature. Output Voltage vs. Temperature shows the regulator VOUT performance up to the maximum rated junction temperature. The overall 125C variation in junction temperature causes an output voltage change of about 25 mV. Figure 19. Output Voltage vs. Temperature Output Voltage (Rated) vs. Temperature. Output Voltage (Rated) vs. Temperature shows the regulator steady state performance when fully loaded (1.5 A) in an ambient temperature up to the rated maximum of 70C. The output variation at maximum load is approximately 13 mV across the normal temperature range. Figure 20. Output Voltage (Rated) vs. Temperature |
Similar Part No. - CMPWR280TO |
|
Similar Description - CMPWR280TO |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |