APL1117A15VE-TRG データシートの表示（PDF） - Anpec Electronics

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APL1117A15VE-TRG

1A Low Dropout Linear Regulator

Anpec Electronics 

APL1117A

Application Information (Cont.)

Ripple Protection (Cont.)

is normally in the range of 100Ω to 200Ω. The size of the

required adjust pin capacitor is a function of the input

ripple frequency. At 120Hz, with R1=100Ω, the adjust pin

capacitor should be 13µF. For fixed voltage devices and

adjustable devices without an adjust pin capacitor, the

output ripple will increase as the ratio of the output volt-

age to the reference voltage (VOUT /VREF ).

Thermal Consideration

The APL1117A regulators have thermal protection to limit

junction temperature to 150ºC. However, device function-

ality is only guaranteed to a maximum junction tempera-

ture of +125ºC.

Both of the thermal resistance of the case to circuit board

and the rate of air flow control the APL1117A’s maximum

power dissipation. The power dissipation across the

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

sipation

is:

P

DMAX

=

(T -T )

JA

/

(θJC

+θCA),

where

T -T

JA

is

the

temperature difference between the junction and ambi-

ent air, θJC is the thermal resistance of the package, and

θCA is the thermal resistance through the printed circuit

board, copper traces, and other materials to the ambient

air (θJC+θCA =θJA). The VOUT pin (Tab) of the APL1117A

provides a channeling heat away. If power dissipation is

large, connect the VOUT pin to a large plane, which can

improve the problem of over heat of IC.

Copyright © ANPEC Electronics Corp.

7

Rev. A.4 - May., 2010

www.anpec.com.tw

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