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TS39154 Folha de dados(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

Nome de Peças TS39154
Descrição Electrónicos  1.5A Ultra Low LDO with Enable
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Fabricante Electrônico  TSC [Taiwan Semiconductor Company, Ltd]
Página de início  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS39154 Folha de dados(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS39154
1.5A Ultra Low LDO with Enable
5/7
Version: D08
Application Information (Continue)
Thermal Characteristics
TS39154 linear regulators are simple to use, the most complicated design parameters to consider are thermal
characteristics, thermal design requires the following application specification parameters:
Maximum ambient temperature, TA
Output current, IOUT
Output voltage, VOUT
Input voltage, VIN
Calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet,
where the ground current is taken from data sheet.
PD = (VIN – VOUT) x IOUT + VIN x IGND
The heat sink thermal resistance is determined by:
ӨSA = (TJ(MAX) – TA) / PD – (ӨJC + ӨCS)
Where
TJ(MAX) ≤ 125oC and ӨCS is between 0oC and 2oC/W. The heat sink may by significantly reduced in
applications where the minimum input voltage is know and is large compared with the dropout voltage and distribute
the heat between this resistor and the regulator. The low dropout properties of vertical PNP regulators allow
significant reductions in regulator power dissipation and the associated heat sink without compromising performance.
When this technique is employed, a capacitor of at least 1uF is needed directly between the input and regulator
ground.


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