参数资料
型号: APL5153-21B
厂商: Anpec Electronics Corporation
英文描述: Low IQ, Low Dropout 150mA Fixed Voltage Regulator
中文描述: 低智商,固定为150mA低压降稳压器
文件页数: 12/16页
文件大小: 318K
代理商: APL5153-21B
Copyright
ANPEC Electronics Corp.
Rev. B.4 - May., 2005
APL5151/ 2/ 3/ 4
www.anpec.com.tw
12
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 APL5151/2/3/4 in the event 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 APL5151/2/3/4’s
maximum power dissipation. The power dissipation
across the device is P
D
= I
OUT
(V
IN
-V
OUT
) and the maxi-
mum power dissipation is:
P
DMAX
= (T
J
-T
A
) / (
where T
J
-T
A
is the temperature difference between the
junction and ambient air,
tance of the package, and
tance through the printed circuit board, copper traces,
and other materials to the ambient air.
The GND pin of the APL5151/2/3/4 provide an electri-
cal connection 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 im-
prove the problem of over heat of IC.
JC
+
CA
)
JC
is the thermal resis-
CA
is the thermal resis-
T hermal Protec tion
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