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APL5302-38A Datasheet(PDF) 11 Page - Anpec Electronics Coropration

Part # APL5302-38A
Description  Low IQ, Low Dropout 300mA Fixed Voltage Regulator
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

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Copyright  ANPEC Electronics Corp.
Rev. B.1 - Mar., 2004
APL5301/2
www.anpec.com.tw
11
Thermal protection limits total power dissipation in the
device. When the junction temperature exceeds
T
J=+150°C, the thermal sensor generates a logic sig-
nal to turn off the pass transistor and allows IC to
cool. When the IC’s junction temperature is down by
10
°C, the thermal sensor will turn the pass transistor
on again, resulting in a pulsed output during continu-
ous thermal protection. Thermal protection is designed
to protect the APL5301/2 in the event of fault
conditions. For continuous operation, do not exceed
the absolute maximum junction temperature of
T
J=+150°C.
Operating Region and Power Dis-
sipation
The thermal resistance of the case to circuit board,
and the rate of air flow all control the APL5301/2’s
maximum power dissipation. The power dissipation
across the device is P
D = IOUT (VIN-VOUT) and the maxi-
mum power dissipation is:
P
DMAX = (TJ-TA) / (θJC CA)
where T
J-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 materials to the ambient air.
The GND pin of the APL5301 and APL5302 that the
packages ard SOT-23-5, SOT-89-5 AND SOP-8 pro-
vide an electrical connection to ground and channel-
ing heat away. If power dissipation is large, connect
the GND pin to ground using a large pad or ground
plane, can improve the problem of over heat of IC.
Thermal Protection


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