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APL5901-23UC Datasheet(PDF) 11 Page - Anpec Electronics Coropration

Part # APL5901-23UC
Description  Low IQ, Low Dropout 900mA Fixed Voltage Regulator
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APL5901-23UC Datasheet(HTML) 11 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. B.2 - May., 2005
APL5901/2
www.anpec.com.tw
11
Thermal protection limits total power dissipation in the
device. When the junction temperature exceeds
T
J=+150℃, 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℃, 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 APL5901/2 in the ev ent of fault
conditions. For continuous operation, do not exceed
the absolute maximum junction temperature of
T
J=+150℃.
Operating Region and Power Dis-
sipation
The thermal resistance of the case to circuit board,
and the rate of air flow all control the APL5901/2’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) / (θ JC + θ CA)
where T
J-TA is the temperature difference between the
junction and ambient air, θ
JC is the thermal resis-
tance of the package, and θ
CA is the thermal resis-
tance through the printed circuit board, copper traces,
and other materials to the ambient air.
The GND pin of the APL5901 provide an electrical con-
nection to ground and channeling 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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