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MC33275D-5.0 参数 Datasheet PDF下载

MC33275D-5.0图片预览
型号: MC33275D-5.0
PDF下载: 下载PDF文件 查看货源
内容描述: 300毫安,低压差稳压器 [300 mA, Low Dropout Voltage Regulator]
分类和应用: 线性稳压器IC调节器电源电路光电二极管输出元件
文件页数/大小: 15 页 / 168 K
品牌: ONSEMI [ ONSEMI ]
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MC33275, NCV33275  
DEFINITIONS  
Load Regulation − The change in output voltage for a  
difference between the input power (V X I ) and the  
CC CC  
change in load current at constant chip temperature.  
Dropout Voltage − The input/output differential at which  
the regulator output no longer maintains regulation against  
further reductions in input voltage. Measured when the  
output drops 100 mV below its nominal value (which is  
measured at 1.0 V differential), dropout voltage is affected  
by junction temperature, load current and minimum input  
supply requirements.  
output power (V X I ) is increasing.  
out out  
Depending on ambient temperature, it is possible to  
calculate the maximum power dissipation and so the  
maximum current as following:  
T – T  
J
A
Pd +  
R
JA  
The maximum operating junction temperature T is  
J
specified at 150°C, if T = 25°C, then P can be found. By  
Output Noise Voltage − The RMS AC voltage at the  
output with a constant load and no input ripple, measured  
over a specified frequency range.  
A
D
neglecting the quiescent current, the maximum power  
dissipation can be expressed as:  
Maximum Power Dissipation − The maximum total  
dissipation for which the regulator will operate within  
specifications.  
Quiescent Current − Current which is used to operate the  
regulator chip and is not delivered to the load.  
Line Regulation − The change in output voltage for a  
change in the input voltage. The measurement is made under  
conditions of low dissipation or by using pulse techniques  
such that the average chip temperature is not significantly  
affected.  
Maximum Package Power Dissipation − The maximum  
package power dissipation is the power dissipation level at  
which the junction temperature reaches its maximum value  
i.e. 150°C. The junction temperature is rising while the  
P
D
I
+
out  
V
– V  
out  
CC  
The thermal resistance of the whole circuit can be  
evaluated by deliberately activating the thermal shutdown  
of the circuit (by increasing the output current or raising the  
input voltage for example).  
Then you can calculate the power dissipation by  
subtracting the output power from the input power. All  
variables are then well known: power dissipation, thermal  
shutdown temperature and ambient temperature.  
T – T  
J
A
R
+
J
A
P
D
http://onsemi.com  
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