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參數(shù)資料
| 型號(hào)： | LP2950ACZ-3.0G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 100 mA, Low Power Low Dropout Voltage Regulator |
| 中文描述： | 3 V FIXED POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PBCY3 |
| 封裝： | LEAD FREE, PLASTIC, TO-92, 3 PIN |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 204K |
| 代理商： | LP2950ACZ-3.0G |
LP2950, LP2951, NCV2951
http://onsemi.com
10
Figure 19. Adjustable Regulator
Error
Output
Shutdown
Input
V
in
V
out
1.23 to 30 V
3.3 F
0.01 F
NC
NC
R
2
R1
100 k
5
3
Error
SD
GND
FB
4
7
6
V
O
T
SNS
2
V
out
V
in
8
1
The complete equation for the output voltage is:
V
ref
(
1
where V
ref
is the nominal 1.235 V reference voltage and I
FB
is the feedback pin bias current, nominally 20 nA. The
minimum recommended load current of 1.0 A forces an
upper limit of 1.2 M on the value of R2, if the regulator
must work with no load. I
FB
will produce a 2% typical error
in V
out
which may be eliminated at room temperature by
adjusting R1. For better accuracy, choosing R2
= 100 k
reduces this error to 0.17% while increasing the resistor
program current to 12 A. Since the LP2951 typically draws
75 A at no load with Pin 2 open circuited, the extra 12 A
of current drawn is often a worthwhile tradeoff for
eliminating the need to set output voltage in test.
Vout
R1 R2
)
IFBR1
Output Noise
In many applications it is desirable to reduce the noise
present at the output. Reducing the regulator bandwidth by
increasing the size of the output capacitor is the only method
for reducing noise on the 3 lead LP2950. However,
increasing the capacitor from 1.0 F to 220 F only
decreases the noise from 430 V to 160 Vrms for a 100 kHz
bandwidth at the 5.0 V output.
Noise can be reduced fourfold by a bypass capacitor
across R1, since it reduces the high frequency gain from 4
to unity. Pick
CBypass
1
2 R1 x 200 Hz
or about 0.01 F. When doing this, the output capacitor must
be increased to 3.3 F to maintain stability. These changes
reduce the output noise from 430 V to 126 Vrms for a
100 kHz bandwidth at 5.0 V output. With bypass
capacitor added, noise no longer scales with output voltage
so that improvements are more dramatic at higher output
voltages.
Figure 20. 1.0 A Regulator with 1.2 V Dropout
0.01 F
10 k
MTB23P06E
1.0 F
Unregulated
Input
Error
Output
Shutdown
Input
V
out
5.0 V
±
1.0%
0 to 1.0 A
220
F
2.0 k
5
3
Error
SD
GND
FB
4
7
6
V
O
T
SNS
2
V
out
V
in
8
1
0.002 F
1.0 M
LP2951CN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP2950CN-33 | 100mA LOW DROPOUT VOLTAGE REGULATOR |
| LP2950AT-3.0 | 100 mA Low Dropout Voltage Regulators |
| LP2950CT-3.0 | 100 mA Low Dropout Voltage Regulators |
| LP2950AS | 100 mA Low Dropout Voltage Regulators |
| LP2950AT | 100 mA Low Dropout Voltage Regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2950ACZ5.0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LP2950ACZ-5.0 | 功能描述:低壓差穩(wěn)壓器 - LDO 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2950ACZ-5.0 | 制造商:Texas Instruments 功能描述:IC V REG LDO +5.0V 2950 TO-92-3 |
| LP2950ACZ-5.0/LFT1 | 功能描述:低壓差穩(wěn)壓器 - LDO 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2950ACZ-5.0/LFT2 | 功能描述:低壓差穩(wěn)壓器 - LDO 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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