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| 型号： | LP2950ACZ-5.0RA |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .1A TO-92 |
| 产品变化通告： | Product Discontinuation 27/Jun/2007 |
| 标准包装： | 2,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 30V |
| 电压 - 压降（标准）： | 0.35V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-226-3、TO-92-3（TO-226AA）成形引线 |
| 供应商设备封装： | TO-92-3 |
| 包装： | 带卷 (TR) |
LP2950, LP2951, NCV2951
V in
for reducing noise on the 3 lead LP2950. However,
8
V in
V out
C
[
Error
Output
Shutdown
Input
100 k
5
Error
SNS
3
SD V O T
GND FB
4 7
1
2
NC
6 NC
R1
R 2
0.01 m F
V out
1.23 to 30 V
3.3 m F
increasing the capacitor from 1.0 m F to 220 m F only
decreases the noise from 430 m V to 160 m 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
1
Bypass 2 p R1 x 200 Hz
or about 0.01 m F. When doing this, the output capacitor must
be increased to 3.3 m F to maintain stability. These changes
reduce the output noise from 430 m V to 126 m 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
Figure 19. Adjustable Regulator
voltages.
V + V ( 1 ) R1 R2 ) ) I R1
The complete equation for the output voltage is:
out ref FB
Unregulated
Input
1.0 m F
10 k
0.01 m F
MTB23P06E
V in
5 Error
V out
SD
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 m A forces an
upper limit of 1.2 M W 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 m A. Since the LP2951 typically draws
75 m A at no load with Pin 2 open circuited, the extra 12 m A
of current drawn is often a worthwhile tradeoff for
eliminating the need to set output voltage in test.
Output Noise
Error
Output
Shutdown
Input
3 6
8
1
2
SNS
LP2951CN
V O T
GND FB
4 7
0.002 m F
1.0 M
2.0 k
V out
5.0 V ? 1.0%
0 to 1.0 A
220 m F
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
Figure 20. 1.0 A Regulator with 1.2 V Dropout
http://onsemi.com
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2950AS | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:100 mA Low Dropout Voltage Regulators |
| LP2950AS-3.0 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:100 mA Low Dropout Voltage Regulators |
| LP2950AS-3.3 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:100 mA Low Dropout Voltage Regulators |
| LP2950AS-5.0 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:100 mA Low Dropout Voltage Regulators |
| LP2950AT | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:100 mA Low Dropout Voltage Regulators |
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