APL5158-12BC-TRL 데이터 시트보기 (PDF) - Anpec Electronics

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APL5158-12BC-TRL

150mA CMOS Low Dropout Regulator With Power OK

Anpec Electronics 

APL5158

Application Information

Thermal Protection

Thermal protection limits total power dissipation in the

APL5158. When the junction temperature exceeds

TJ=+150°C, the thermal sensor generate a logic sig-

nal to turn off the pass transistor and let IC to cool.

When the IC’s junction temperature cools by 15°C,

the thermal sensor will turn the pass transistor on

again, resulting in a pulsed output during continuous

thermal protection. Thermal protection is designed to

protect the IC in the event of fault conditions. For

continual operation, do not exceed the absolute maxi-

mum junction temperature rating of TJ=+150°C.

Operating Region and Power Dissi-

pation

The thermal resistance of the case and circuit board,

ambient and junction air temperature, and the rate of

air flow all control the APL5158’s maximum power

dissipation. The power dissipation across the device

is P = IOUT (VIN-VOUT). The maximum power dissipa-

tion is:

PMAX = (TJ-TA) / (θJB +θBA)

where TJ-TA is the temperature difference between

the junction and ambient air. θJB(or θJB) is the thermal

resistance of the package, θBA is the thermal resis-

tance through the printed circuit board, copper

traces, and other materials to the surrounding air.

The GND pin of the APL5158 provide an electrical

connection to ground and channeling heat away.

Connect the GND pin to ground using a large pad or

ground plane as a heatsink, it can improve maximize

thermal dissipation.

Copyright  ANPEC Electronics Corp.

11

Rev. A.5 - Aug., 2004

www.anpec.com.tw

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