參數(shù)資料
型號(hào)： A6155
廠商： Electronic Theatre Controls, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： High Efficiency Linear Power Supply
中文描述： 高效率線性電源供應(yīng)器
文件頁(yè)數(shù)： 6/15頁(yè)
文件大?。?/td> 462K
代理商： A6155
6
A6155
Block Diagram
Pin Description
Pin Name
1
EN
2
RES
Function
Push-pull active low enable output
Open drain active low reset output.
RES must be pulled up to V
OUTPUT
even if unused
Watchdog timer clear input signal
GND terminal
Voltage regulator input
OUTPUT Voltage regulator output
R
R
EXT
input for RC oscillator tuning
V
IN
Voltage comparator input
3
4
5
6
7
8
TCL
V
SS
INPUT
Table 5
Functional Description
Voltage Regulator
The A6155 has a 5 V
±
2%, 100 mA, low dropout volt-
age regulator. The low supply current (typ.155
μ
A) mak-
es the A6155 particularly suited to automotive systems then
remain energized 24 hours a day. The input voltage range is
2.3 V to 26 V for operation and the input protection includes
both reverse battery (20 V below ground) and load dump
(positive transients up to 60 V). There is no reverse current
flow from the OUTPUT to the INPUT when the INPUT equals
V
SS
. This feature is important for systems which need to
implement (with capacitance) a minimum power supply
hold-up time in the event of power failure. To achieve good
load regulation a 22
μ
F capacitor (or greater ) is needed on
the INPUT (see Fig.9). Tantalum or aluminium electrolytics
are adequate for the 22
μ
F capacitor; film types will work but
are relatively expensive. Many aluminium electrolytics have
electrolytes that freeze at about –30
°
C, so tantalums are
recommended for operation below –25
°
C. The important
parameters of the 22
μ
F capacitor are an effective series
resistance of
≤
5
and a resonant frequency above
500 kHz..
A 10
μ
F capacitor (or greater) and a 100 nF capacitor
are required on the OUTPUT to prevent oscillations due
to instability. The specification of the 10
μ
F capacitor is
as per the 22
μ
F capacitor on the INPUT (see previous
paragraph).
The A6155 will remain stable and in regulation with no
external load and the dropout voltage is typically con-
stant as the input voltage fall to below its minimum level
(see Table 2). These features are especially important in
CMOS RAM keep-alive applications.
Care must be taken not to exceed the maximum junction
temperature (+ 85
°
C). The power dissipation within the
A6155 is given by the formula:
P
TOTAL
= (V
INPUT
– V
OUTPUT
) * I
OUTPUT
+ (V
INPUT
) * I
SS
The maximum continuous power dissipation at a given
temperature can be calculated using the formula:
P
MAX
= ( 85
°
C – T
A
) / R
th(j-a)
where R
is the termal resistance from the junction to
the ambient and is specified in Table 2. Note the R
given in Table 2 assumes that the package is soldered
to a PCB. The above formula for maximum power dissi-
pation assumes a constant load (ie.
≥
100 s). The
transient thermal resistance for a single pulse is much
lower than the continuous value. For example the A6155
in DIP8 package will have an effective thermal resistance
from the junction to the ambient of about 10
°
C/W for a
single 100 ms pulse.
V
IN
Monitoring
The power-on reset and the power-down reset are
generated as a response to the external voltage level
applied on the V
input. The V
voltage at which reset is
asserted or released is determined by the external
voltage divider between V
and V
, as shown on Fig. 9.
A part of V
is compared to the internal voltage
reference. To determine the values of the divider, the
leakage current at V
IN
must be taken into account, as
Voltage
Regulator
Voltage
Reference
Voltage
Reference
INPUT
V
IN
R
OUTPUT
Enable
Logic
Reset
Control
Timer
V
REF
Comparator
TCL
Fig. 8
EN
RES
Current
Controlled
Oscillator
Open drain
output RES
Switch
R
1
～
1 M
Controller
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