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參數(shù)資料
| 型號： | 01F2160 |
| 英文描述： | IC-VOLTAGE REG +3V |
| 中文描述： | 集成電路3V的電壓退訂 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 342K |
| 代理商： | 01F2160 |
LP2950
http://onsemi.com
9
Figure 16. Adjustable Regulator
Error
Output
Shutdown
Input
Vin
Vout
1.23 to 30 V
3.3
F
0.01
F
NC
R2
R1
100 k
5
3
Error
SD
Gnd
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
The complete equation for the output voltage is:
Vout + Vref (1 ) R1 R2) ) IFB R1
where Vref is the nominal 1.235 V reference voltage and IFB
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. IFB will produce a 2% typical error
in Vout 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.
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
C
Bypass [
1
2
pR1 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 17. 1.0 A Regulator with 1.2 V Dropout
0.01
F
10 k
MTB23P06E
1.0
F
Unregulated
Input
Error
Output
Shutdown
Input
Vout
5.0 V
±1.0%
0 to 1.0 A
220
F
2.0 k
5
3
Error
SD
Gnd
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
0.002
F
1.0 M
LP2951CN
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