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參數(shù)資料
| 型號： | LM2931CD2TR4 |
| 英文描述： | VOLT REGULATOR|ADJUSTABLE|+1.24 TO +29V|BIPOLAR|SIP|5PIN|PLASTIC |
| 中文描述： | 電壓調節(jié)器|調節(jié)| 1.24 29V |雙極|園區(qū)| 5PIN |塑料 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 209K |
| 代理商： | LM2931CD2TR4 |
LM2931 Series
http://onsemi.com
8
,
r
V
V
O
, OUTPUT VOLTAGE (V)
1.160
1.180
1.200
1.220
1.240
0
3.0
6.0
9.0
12
15
18
21
24
18.5
14
t, TIME (10
μ
s/DIV)
V
out
= 5.0 V
R
L
= 500
C
O
= 100
μ
F
C
O(ESR)
= 0.3
T
A
= 25
°
C
100
0
t, TIME (10
μ
s/DIV)
V
O
, OUTPUT VOLTAGE (V)
V
2.0
2.1
2.2
0
3.0
6.0
9.0
12
15
18
21
24
Output On"
Output Off"
2.4
2.5
2.6
2.3
LM2931C Adjustable
I
O
= 10 mA
V
in
= V
out
+ 1.0 V
T
A
= 25
°
C
V
in
= 14 V
V
out
= 5.0 V
C
in
= 1000
μ
F
C
O
= 100
μ
F
C
O(ESR)
= 0.3
T
A
= 25
°
C
LM2931C Adjustable
I
O
= 10 mA
V
in
= V
out
+ 1.0 V
T
A
= 25
°
C
O
I
o
V
O
O
I
V
i
V
O
O
Figure 13. Line Regulation
Figure 14. Load Regulation
Figure 15. Reference Voltage versus Output Voltage
Figure 16. Output Inhibit–Thresholds
versus Output Voltage
APPLICATIONS INFORMATION
The LM2931 series regulators are designed with many
protection features making them essentially blow–out
proof. These features include internal current limiting,
thermal shutdown, overvoltage and reverse polarity input
protection, and the capability to withstand temporary
power–up with mirror–image insertion. Typical application
circuits for the fixed and adjustable output device are shown
in Figures 17 and 18.
The input bypass capacitor C
in
is recommended if the
regulator is located an appreciable distance (
≥
4
″
) from the
supply input filter. This will reduce the circuit’s sensitivity
to the input line impedance at high frequencies.
This regulator series is not internally compensated and
thus requires an external output capacitor for stability. The
capacitance value required is dependent upon the load
current, output voltage for the adjustable regulator, and the
type of capacitor selected. The least stable condition is
encountered at maximum load current and minimum output
voltage. Figure 22 shows that for operation in the “Stable”
region, under the conditions specified, the magnitude of the
output capacitor impedance |Z
O
| must not exceed 0.4
. This
limit must be observed over the entire operating temperature
range of the regulator circuit.
With economical electrolytic capacitors, cold temperature
operation can pose a serious stability problem. As the
electrolyte freezes, around –30
°
C, the capacitance will
decrease and the equivalent series resistance (ESR) will
increase drastically, causing the circuit to oscillate. Quality
electrolytic capacitors with extended temperature ranges of
–40
°
to +85
°
C and –55
°
to +105
°
C are readily available.
Solid tantalum capacitors may be a better choice if small size
is a requirement, however, the maximum
Z
O
limit over
temperature must be observed.
Note that in the stable region, the output noise voltage is
linearly proportional to
Z
O
.
In effect, C
O
dictates the high
frequency roll–off point of the circuit. Operation in the area
titled “Marginally Stable” will cause the output of the
regulator to exhibit random bursts of oscillation that decay
in an under–damped fashion. Continuous oscillation occurs
when operating in the area titled “Unstable”. It is suggested
that oven testing of the entire circuit be performed with
maximum load, minimum input voltage, and minimum
ambient temperature.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM2931CD2TR4G | 功能描述:低壓差穩(wěn)壓器 - LDO 3-24V ADJ 100mA w/Load Dump RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2931CD2TR4G-CUT TAPE | 制造商:ON 功能描述:LM2931 Series 40 V 100mA Adjustable Output LDO Voltage Regulator - D2PAK |
| LM2931CDG | 功能描述:低壓差穩(wěn)壓器 - LDO 3-24V ADJ 100mA w/Load Dump RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2931CDR2 | 功能描述:低壓差穩(wěn)壓器 - LDO 3-24V ADJ 100mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2931CDR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 3-24V ADJ 100mA w/Load Dump RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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