CS5205-1GDPR3 datasheet(7/9 Pages) ONSEMI

Il numero della parte	CS5205-1GDPR3

Spiegazioni elettronici	5.0 A Adjustable, and 3.3 V and 5.0 V Fixed Linear Regulators

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Produttore elettronici	ONSEMI [ON Semiconductor]

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CS5205−1, CS5205−3, CS5205−5

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7

Calculating Power Dissipation and Heat Sink

Requirements

The CS5205−x series of linear regulators includes thermal

shutdown and current limit circuitry to protect the device.

High power regulators such as these usually operate at high

junction temperatures so it is important to calculate the

power dissipation and junction temperatures accurately to

ensure that an adequate heat sink is used.

The case is connected to VOUT on the CS5205−x,

electrical isolation may be required for some applications.

Thermal compound should always be used with high current

regulators such as these.

The thermal characteristics of an IC depend on the

following four factors:

1. Maximum Ambient Temperature TA (°C)

2. Power dissipation PD (Watts)

3. Maximum junction temperature TJ (°C)

4. Thermal resistance junction to ambient RqJA (°C/W)

These four are related by the equation

TJ + TA ) PD

RQJA

(1)

The maximum ambient temperature and the power

dissipation are determined by the design while the

maximum junction temperature and the thermal resistance

depend on the manufacturer and the package type.

The maximum power dissipation for a regulator is:

PD(max) + {VIN(max) * VOUT(min)}IOUT(max) ) VIN(max)IQ

(2)

where:

VIN(max) is the maximum input voltage,

VOUT(min) is the minimum output voltage,

IOUT(max) is the maximum output current, for the

application

IQ is the maximum quiescent current at IOUT(max).

A heat sink effectively increases the surface area of the

package to improve the flow of heat away from the IC and

into the surrounding air.

Each material in the heat flow path between the IC and the

outside environment has a thermal resistance. Like series

electrical resistances, these resistances are summed to

determine RqJA, the total thermal resistance between the

junction and the surrounding air.

1. Thermal Resistance of the junction to case, RqJC

(°C/W)

2. Thermal Resistance of the case to Heat Sink, RqCS

(°C/W)

3. Thermal Resistance of the Heat Sink to the ambient

air, RqSA (°C/W)

These are connected by the equation:

RQJA + RQJC ) RQCS ) RQSA

(3)

The value for RqJA is calculated using equation (3) and the

result can be substituted in equation (1).

The value for RqJC is 3.5°C/W for a given package type

based on an average die size. For a high current regulator

such as the CS5205−x the majority of the heat is generated

in the power transistor section. The value for RqSA depends

on the heat sink type, while RqCS depends on factors such as

package type, heat sink interface (is an insulator and thermal

grease used?), and the contact area between the heat sink and

the package. Once these calculations are complete, the

maximum permissible value of RqJA can be calculated and

the proper heat sink selected. For further discussion on heat

sink

selection,

see

application

note

“Thermal

Management,” document number AND8036/D, available

through the Literature Distribution Center or via our website

at http://onsemi.com.

ORDERING INFORMATION

Orderable Part Number

Type

Package

Shipping†

CS5205−1GT3

5.0 A, Adj. Output

TO−220−3, STRAIGHT

50 Units / Rail

CS5205−1GDP3

5.0 A, Adj. Output

D2PAK−3

50 Units / Rail

CS5205−1GDPR3

5.0 A, Adj. Output

D2PAK−3

750 / Tape & Reel

CS5205−3GT3

5.0 A, 3.3 V Output

TO−220−3, STRAIGHT

50 Units / Rail

CS5205−3GDP3

5.0 A, 3.3 V Output

D2PAK−3

50 Units / Rail

CS5205−3GDPR3

5.0 A, 3.3 V Output

D2PAK−3

750 / Tape & Reel

CS5205−5GT3

5.0 A, 5.0 V Output

TO−220−3, STRAIGHT

50 Units / Rail

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

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