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AP1153ADS30

AP1153ADS30首页预览图
型号: AP1153ADS30
PDF文件:
  • AP1153ADS30 PDF在线浏览
功能描述: 14V Input / 100mA Output LDO Regulator
PDF文件大小: 1110.13 Kbytes
PDF页数: 共30页
制造商: AKM[Asahi Kasei Microsystems]
制造商LOGO: AKM[Asahi Kasei Microsystems] LOGO
制造商网址: http://www.akm.com
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PDF页面索引
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[AP1153ADSXX]
015000869-E-00 - 23 - 2015/01
11.9 Operating Region and Power Dissipation
The power dissipation of the device depends on the junction temperature. Therefore, the package dissipation is
assumed to be an internal limitation. The package itself does not have enough heat radiation characteristic due
to the small size. Heat runs away by mounting IC on PCB. This value changes by the material, copper pattern
etc. of PCB.
The overheating protection operates when there is a lot of loss inside the regulator (Ambient temperature high,
heat radiation bad, etc.). The output current and the output voltage will drop when the protection circuit
operates. When joint temperature (Tj) reaches the set temperature, IC stops the operation. However, operation
begins at once when joint temperature (Tj) decreases.
The thermal resistance when mounted on PCB
The chip junction temperature during operation is shown by Tj=θJA×Pd+Ta. Junction temperature (Tj) is
limited around 140°C by the thermal protection circuit. Pd is the value when the overheating protection circuit
starts operation.
When you assume the ambient temperature to be 25°C,
140 = θJA × Pd(W) + 25
θJA × Pd = 115
θJA = 115/Pd (°C /W)
Figure 5. Example PCB layout
PCB Material: Two layer glass epoxy substrate
(x=30mm,y=30mm,t=1.0mm,Copper pattern thickness 35um)
AP1153ADSXX (SOT23-5)
Please derate 5.4mW/°C at Pd=677mW above 25°C. Thermal resistance (θJA) is 185°C/W.
Method of obtaining Pd easily
Connect output terminal to GND (short circuited), and measure the input current by increasing the input voltage
gradually up to 10V. The input current will reach the maximum output current, but will decrease soon according to
the chip temperature rising, and will finally enter the state of thermal equilibrium (natural air cooling).
The input current and the input voltage of this state will be used to calculate the Pd.
Pd(mW) ≈ Vin (V) × Iin (mA)
When the device is mounted, mostly achieve: 500mW or more
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