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AMC1117SKF датащи(PDF) 7 Page - ADDtek Corp

номер детали AMC1117SKF
подробное описание детали  1A LOW DROPOUT POSITIVE REGULATOR
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производитель  ADDTEK [ADDtek Corp]
домашняя страница  https://www.addmtek.com
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AMC1117SKF датащи(HTML) 7 Page - ADDtek Corp

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AMC1117
Copyright
© 2006 ADDtek Corp.
7
DD004_K -- JULY 2006
Application Note:
Maximum Power Calculation:
Thermal consideration:
When power consumption is over about 404 mW (for SOT-223 package, 687mW for TO-252 package, at TA=70
OC),
additional heat sink is required to control the junction temperature below 125
OC.
The junction temperature is: TJ = P D JT + θCS + θSA) + TA
P D: Dissipated power.
θJT: Thermal resistance from the junction to the mounting tab of the package.
θCS: Thermal resistance through the interface between the IC and the surface on which it is mounted. (Typically,
θCS < 1.0°C/W)
θSA: Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink).
If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of
copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with
several through hole vias.
PCB
θSA(OC /W)
59
45
38
33
27
24
21
PCB heat sink size (mm2) 500
1000
1500
2000
3000
4000
5000
Recommended figure of PCB area used as a heat sink.
TJ(MAX) – TA(MAX)
PD(MAX)=
θ
JA
TJ(
OC): Maximum recommended junction temperature
TA(
OC): Ambient temperature of the application
θ
JA(
OC/W): Junction-to-junction temperature thermal resistance of the package, and other heat dissipating
materials.
The maximum power dissipation of a single-output regulator :
PD(MAX) = [(VIN(MAX) - VOUT(NOM))] × IOUT(NOM) + VIN(MAX) × IQ
Where:
VOUT(NOM) = the nominal output voltage
IOUT(NOM) = the nominal output current, and
IQ = the quiescent current the regulator consumes at IOUT(MAX)
VIN(MAX) = the maximum input voltage
Then
θ
JA = (150
OC – TA)/ PD
(Top View)
(Bottom View)
through hole vias


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