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參數(shù)資料
| 型號(hào)： | AMS2930T-X |
| 廠商： | Advanced Monolithic Systems, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 150mA LOW DROPOUT VOLTAGE REGULATOR |
| 中文描述： | 150mA的低壓差穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 81K |
| 代理商： | AMS2930T-X |
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS2930
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Maximum Power Dissipation (TO-263)
1
2
3
4
AMBIENT TEMPERATURE (° C)
P
10 20 30 40 50 60 70 80 90 100
0
0
θ
JA
= 32° C/W
0.01
0.1
100
0
25
OUTPUT CURRENT (mA)
50
75
150
Output Capacitor ESR
E
)
1
10
V
O
= 5V
C
OUT
= 100
μ
F
100
3.0
2.8
4.0
3.8
On/Off Treshold
2.2
2.0
2.4
2.6
3.2
3.4
3.6
O
3
6
9
12
15
18
21
24
0
ONN
OFF
OUTPUT VOLTAGE (V)
θ
JA
= 37° C/W
θ
JA
= 50° C/W
θ
JA
= 73° C/W
AMS2930C ADJUSTABLE
STABLE
REGION
125
APPLICATION HINTS
The AMS2930 series require an output capacitor for device
stability. The value required depends on the application circuit
and other factors.
Because high frequency characteristics of electrolytic capacitors
depend greatly on the type and even the manufacturer, the value
of capacitance that works well with AMS2930 for one brand or
type may not necessary be sufficient with an electrolytic of
different origin. Sometimes actual bench testing will be the only
means to determine the proper capacitor type and value. To
obtain stability in all general applications a high quality 100
μ
F
aluminum electrolytic or a 47
μ
F tantalum electrolytic can be
used.
A critical characteristic of the electrolytic capacitors is their
performance over temperature. The AMS2930 is designed to
operate to -40
°
C, but some electrolytics will freeze around -30
°
C
therefore becoming ineffective. In such case the result is
oscillation at the regulator output. For all application circuits
where cold operation is necessary, the output capacitor must be
rated to operate at the minimum temperature. In applications
where the regulator junction temperature will never be lower than
25
°
C the output capacitor value can be reduced by a factor of two
over the value required for the entire temperature range (47
μ
F for
a high quality aluminum or 22
μ
F for a tantalum electrolytic
capacitor).
With higher output currents, the stability of AMS2930 decreases.
Considering the fact that in many applications the AMS2930 is
operated at only a few milliamps (or less) of output current, the
output capacitor value can be reduced even further. For example,
a circuit that is required to deliver a maximum of 10mA of output
current from the regulator output will need an output capacitor of
only half the value compared to the same regulator required to
deliver the full output current of 150mA.
In the case of AMS2930C (adjustable), the minimum value of
output capacitance is a function of the output voltage. As a
general rule, with higher output voltages the value of the output
capacitance decreases, since the internal loop gain is reduced.
In order to determine the minimum value of the output capacitor,
for an application circuit, the entire circuit including the capacitor
should be bench tested at minimum operating temperatures and
maximum operating currents. To maintain internal power
dissipation and die heating to a minimum, the input voltage
should be maintain at 0.6V above the output. Worst-case occurs
just after input power is applied and before the die had the
chance to heat up. After the minimum capacitance value has been
found for the specific brand and type of electrolytic capacitor, the
value should be doubled for actual use to cover for production
variations both in the regulator and the capacitor.
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