TS39300CZ datasheet(5/6 Pages) TSC

No de pièce	TS39300CZ

Description	3A Ultra Low Dropout Positive Voltage Regulator

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Fabricant	TSC [Taiwan Semiconductor Company, Ltd]

Site Internet	http://www.taiwansemi.com

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5 / 6 page

TS39300

5-6

2005/12 rev. A

Application Information (continues)

Thermal Design

Linear regulators are simple to use. The most

complicated design parameters to consider are thermal

characteristics.

Thermal

design

requires

four

application-specific

parameters:

Maximum ambient temperature (Ta)

Output Current (Iout)

Output Voltage (Vout)

Input Voltage (Vin)

Ground Current (Ignd)

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) ≤ 125

oC and Өcs is between 0 oC and

2

oC/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 1.0uF is needed

directly between the input and regulator ground.

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TS39300CZ Fiches technique(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

TS39300CZ Fiches technique(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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