APL1565A(2008) View Datasheet(PDF) - Anpec Electronics

Part Name

Description

Manufacturer

APL1565A
(Rev.:2008)

1A Low Dropout, Fast Response Fixed Voltage Regulator

Anpec Electronics 

APL1565A

Application Information

Thermal Protection

Thermal protection limits total power dissipation in the

device. When the junction temperature exceeds

TJ=+150℃, the thermal sensor generates a logic signal

to turn off the pass transistor and allows IC to cool. When

the IC’s junction temperature cools down by 10℃, 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 it in

the event of fault conditions. For continuous operation, it

should not exceed the absolute maximum junction tem-

perature of TJ=+150℃.

Operating Region and Power Dissipation

The thermal resistance of the case to circuit board, and

the rate of air flow all control the APL1565A’s maximum

power dissipation. The power dissipation across the

device is PD = IOUT (VIN-VOUT) and the maximum power dis-

sipation is:

P = (T -T ) / (θ +θ )

DMAX

JA

JC

CA

where TJ-TA is the temperature difference between the

junction and ambient air, θ JC is the thermal resistance of

the

package,

and

θ

CA

is

the

thermal

resistance

through

the printed circuit board, copper traces, and other materi-

als to the ambient air.

The GND pin of the APL1565A provides an electrical con-

nection to ground and channeling heat away. If power

dissipation is large, connecting the GND pin to ground by

using a large pad or ground plane can improve the prob-

lem of over heat of IC.

Copyright © ANPEC Electronics Corp.

9

Rev. A.5 - Mar., 2008

www.anpec.com.tw

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