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參數(shù)資料
| 型號： | APL5325BI-TRL |
| 廠商： | ANPEC ELECTRONICS CORP |
| 元件分類： | 可調(diào)正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | ADJUSTABLE POSITIVE LDO REGULATOR, PDSO5 |
| 封裝： | ROHS COMPLIANT, TO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 259K |
| 代理商： | APL5325BI-TRL |
Copyright
ANPEC Electronics Corp.
Rev. A.1 - Nov., 2008
APL5325
www.anpec.com.tw
9
Function Description
+
=
R2
R1
1
0.8
V
OUT
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 to100k
An error amplifier works with a temperature compensated
0.8V 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.
Output Voltage Regulation
The APL5325 is an adjustable low dropout linear
regulator. The output voltage set by the resistor-divider is
determined by:
Thermal Shutdown
A thermal shutdown circuit limits the junction tempera-
ture of APL5325. When the junction temperature exceeds
+160
ο
C, 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 40
o
C.
The thermal shutdown is designed with a 40
o
C 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 125
o
C.
Shutdown Control
The APL5325 has an active-low shutdown function. Force
SHDN high (>1.6V) enables the V
OUT
; force SHDN low
(<0.4V) disables the V
OUT
. SHDN is internally pulled low
by a resistor (3m
typical). If it is not used, connect to VIN
for normal operation.
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