ISL59831 데이터 시트보기 (PDF) - Renesas Electronics

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ISL59831

Single Supply Video Driver with Reconstruction Filter and Charge Pump

Renesas Electronics 

ISL59831

Output Drive Capability

The maximum output current for the ISL59831 is set at ±50mA.

Maximum reliability is maintained if the output current never

exceeds ±50mA, after which the electro-migration limit of the

process will be exceeded and the part will be damaged. This

limit is set by the design of the internal metal interconnections.

Power Dissipation

With the high output drive capability of the ISL59831, it is

possible to exceed the +150°C absolute maximum junction

temperature under certain load current conditions. Therefore, it

is important to calculate the maximum junction temperature for

an application to determine if load conditions or package types

need to be modified to assure operation of the amplifier in a

safe operating area.

The maximum power dissipation allowed in a package is

determined according to Equation 1:

PDMAX

=

T----J---M-----A----X-----–-----T----A---M-----A----X--

JA

(EQ. 1)

Where:

TJMAX = Maximum junction temperature

TAMAX = Maximum ambient temperature

JA = Thermal resistance of the package

The maximum power dissipation actually produced by an IC is

the total quiescent supply current times the total power supply

voltage, plus the power in the IC due to the load, or:

for sourcing:

PDMAX = VS  ISMAX + VS – VOUTi  -V----OR----UL----iT----i

(EQ. 2)

for sinking:

PDMAX = VS  ISMAX + VOUTi – VS  ILOADi

(EQ. 3)

Where:

VS = Supply voltage

ISMAX = Maximum quiescent supply current

VOUT = Maximum output voltage of the application

RLOAD = Load resistance tied to ground

ILOAD = Load current

i = Number of output channels

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FN6266 Rev 0.00

Mar 29, 2007

Page 10 of 12

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