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參數(shù)資料
| 型號： | AX1117M-Fix |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | ER 10C 10#16 PIN PLUG |
| 中文描述： | 1.2A的低壓差正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 208K |
| 代理商： | AX1117M-FIX |
Page No. : 4/7
AVANTICS - AX1117 Series
Specification No.: 050309-FE0005
Applications Description
Output Voltage Adjustment
Like most regulators, AX1117 series regulate the output by
comparing the output voltage to an internally generated reference
voltage. On the adjustable version, the V
is available externally as
1.25V between V
and ADJ. The voltage ratio formed by R
and R
2
should be set to conduct 10mA (minimum output load). The output
voltage is given by the following equation: V
OUT
=V
REF
(1+R
2
/R
1
) + I
ADJ
R
On fixed versions of AX1117 series, the voltage divider is provided
internally.
Thermal Protection
AX1117 series have thermal protection which limits junction
temperature to 150
°
C. However, device functionality is only
guaranteed to a maximum junction temperature of +125
°
C.
The power dissipation and junction temperature for AX1117 in all
packages given by
P
D
=(V
IN
- V
OUT
) I
OUT
, T
JUNCTION
=T
AMBIENT
+(P
D
x
θ
JA
), Note: T
JUNCTION
must
not exceed 125
°
C
Current Limit Protection
AX1117 series are protected against overload conditions. Current protection is triggered at typically 1.5A.
Stability And Load Regulation
AX1117 series require a capacitor from V
to GND to provide
compensation feedback to the internal gain stage. This is to ensure
stability at the output terminal. Typically, a 10uF tantalum or 50uF
aluminum electrolytic is sufficient.
Note : It is important that the ESR for this capacitor does not exceed
0.5
.
The output capacitor does not have a theoretical upper limit and
increasing its value will increase stability. C
OUT
= 100 uF or more is
typical for high current regulator design.
AX1117 series load regulation are limited by the resistance of the
wire connecting it to the load(R
P
). For the adjustable version, the best
load regulation is accomplished when the top of the resistor divider(R
1
)
is connected directly to the output pin of the AX1117 series. When so
connected, R
is not multiplied by the divider ratio. For fixed output
versions, the top of R
is internally connected to the output and
ground pin can be connected to low side of the load as a negative
side sense if, so desired.
Thermal Consideration
The AX1117 series contain thermal limiting circuitry designed to protect itself for over-temperature conditions. Even for normal load
conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to
consider all sources of thermal resistance between junction and ambient. It contains junction-to-case, case-to-heat-sink interface and
heat sink resistance itself. An additional heat sink is applied externally sometimes. It can increase the maximum power dissipation. For
example, the equivalent junction temperature of 300mA output current is 115
°
C without external heat sink. Under the same junction
temperature IC can operates 500mA with an adequate heat sink. Therefore, to attach an extra heat sink is recommended.
Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. The bonding
wires are appending paths. The former is the lowest resistance path. Proper mounting is required to ensure the best possible thermal
flow this area of the package to the heat sink. Thermal compound at the case-to-heat-sink interface is strongly recommended. The
case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated,
a thermally conductive spacer can be used, as long its thermal resistance is considered.
Protection Diode
(The figure is shown as Regulator with Reverse Diode Protection in advanced applications)
In general operation, AX1117 series don’t need any protection diodes. From the cross-section structure of AX1117 sries, the output
pin is connected to P+ substrate, and the input pin is connected to N- well. There is a parasitic reverse diode between them. It can
handle microsecond surge currents of 5A to 10A. Even with large output capacitance, it is very difficult to get those values of surge
currents in normal operation. Only with high value output capacitors, such as 1000uF. And with the input pin instantaneously shorted to
ground. can damage occur. A crowbar circuit at the input of the AX1117 series can generate those kinds of currents, and a diode from
output to input is recommended. Normal power supply cycling or even plugging and unplugging in the system will not generate
currents large enough to do any damage.
RL
R1
R2
Connect
R1 to Case
Connect
R2 to Load
Out
In
Adj
R
Parasitic
Line Resistance
V
IN
V
OUT
=V
REF
(1+R
2
/R
1
) + I
ADJ
R
2
V
IN
R1
R2
V
REF
In
Out
ADJ
I
ADJ
10uA
V
OUT
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