APL5327 データシートの表示（PDF） - Anpec Electronics
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APL5327 Datasheet PDF : 14 Pages
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APL5327
Function Description
Output Voltage Regulation
The APL5327 is an adjustable low dropout linear
regulator. The output voltage set by the resistor-divider is
determined by:
VOUT
=
1.2
⋅
1+
R1
R2
Where R1 is connected from VOUT to SET with Kelvin
sensing and R2 is connected from SET to GND. The rec-
ommended value of R2 is in the range of 100 to100kΩ.
An error amplifier works with a temperature compensated
1.2V reference and an output PMOS regulates the output
to the presetting voltage. The error amplifier is designed
with high bandwidth and DC gain provides very fast tran-
sient response and less load regulation. It compares the
reference with the feedback voltage and amplifies the dif-
ference to drive the output PMOS which provides load
current from VIN to VOUT.
Thermal Shutdown
A thermal shutdown circuit limits the junction tempera-
ture of APL5327. When the junction temperature exceeds
+160οC, a thermal sensor turns off the output PMOS, al-
lowing the device to cool down. The regulator regulates
the output again through initiation of a new soft-start cycle
after the junction temperature is cooled down by 40oC.
The thermal shutdown is designed with a 40oC hyster-
esis to lower the average junction temperature during
continuous thermal overload conditions, extending life-
time of the device.
For normal operation, device power dissipation should
be externally limited so that junction temperature will not
exceed 125oC.
Shutdown Control
The APL5327 has an active-low shutdown function. Force
SHDN high (>1.6V) enables the VOUT; force SHDN low
(<0.4V) disables the VOUT. SHDN is internally pulled low
by a resistor (3mΩ typical). If it is not used, connect to VIN
for normal operation.
Copyright © ANPEC Electronics Corp.
8
Rev. A.2 - Jun., 2011
www.anpec.com.tw
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