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參數(shù)資料
| 型號： | APL5101-35DI |
| 廠商： | Anpec Electronics Corporation |
| 英文描述： | 150mA, 4uA Quiescent Current Regulator |
| 中文描述： | 150毫安，4uA靜態(tài)電流調(diào)節(jié)器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 260K |
| 代理商： | APL5101-35DI |
Copyright
ANPEC Electronics Corp.
Rev. A.1 - Jun., 2005
APL5101/ 2
www.anpec.com.tw
9
Application I nformation
Capacitor Selection and Regulation Stability
The APL5101/2 use at least a 1
μ
F capacitor on the
input. This capacitor can use Aluminum, Tantalum or
Ceramic capacitors. Input capacitor with large value
and low ESR provides better PSRR and line transient
response. The output capacitor also can use Aluminum,
Tantalum or Ceramic capacitor, and its proper values
is recommended 1
μ
F, ESR must be above 10m
Large output capacitor values can reduce noise and
improve load-transient response, stability, and PSRR.
With X5R and Y5V dielectrics, 1
μ
F is sufficient at all
operating temperatures. The selection of output capacitor
is important because it with COUT form a zero to provide
the sufficient phase margin.
Input-Output (Dropout) Voltage
The minimum input-output voltage differential (dropout)
determines the lowest usable supply voltage. The
dropout voltage is a function of drain-to-source on
resistance multiplied by the load current.
Current Limit and Short Circuit
APL5101/2 include a current-limit circuitry for this
linear regulator. The current limit protection, which
sense the current flows the P-channel MOSFET, and
controls the output voltage. The point where limiting
occurs is I
OUT
=300mA. When output is shorted to
ground, the APL5101/2 will keep short circuit current
at 50mA .This design is a method for an indefinite
amount of time without damaging to the part.
Thermal Protection
Thermal protection limits total power dissipation in the
APL5101/2. When the junction temperature exceeds
T
J
= +135
°
C, the thermal sensor generate a logic signal
to turn off the pass transistor and let IC to cool.When
the IC’s junction temperature cools by 20
°
C, the
thermal sensor will turn the pass transistor on again,
resulting in a pulsed output during continuous thermal
protection. Thermal protection is designed to protect
the IC in the event of fault conditions. For continual
operation, do not exceed the absolute maximum junction
temperature rating of T
J
= +140
°
C.
Operating Region and Power Dissipation
The thermal resistance of the case and circuit board,
ambient and junction air temperature, and the rate of
air flow all control the APL5101/2’s maximum power
dissipation. The power dissipation across the device
is P = I
OUT
(V
IN
-V
OUT
). The maximum power dissipation
is:
P
MAX
= (T
J
-T
A
) / (
θ
JC
+
θ
CA
)
where T
J
-T
A
is the temperature difference between the
junction and ambient air.
θ
JC
is the thermal resistance
of the package,
θ
CA
is the thermal resistance through
the printed circuit board, copper traces, and other
materials to the surrounding air. The GND pin provides
an electrical connection to ground and channeling heat
away. The printed circuit board (PCB) forms a heat
sink and dissipates most of the heat into ambient air.
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