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參數(shù)資料
| 型號(hào)： | REG103-25 |
| 英文描述： | DMOS 500mA Low Dropout (LDO) Regulator |
| 中文描述： | 的DMOS 500mA的低壓降（LDO）穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 264K |
| 代理商： | REG103-25 |
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REG103
SBVS010A
11
Since the value of V
REF
is 1.295V, this relationship reduces to:
V
Vrms
V
V
N
OUT
=
μ
35
Connecting a capacitor, C
NR
, from the Noise-Reduction
(NR) pin to ground, can reduce the output noise voltage.
Adding C
NR
, as shown in Figure 7, forms a low-pass filter
for the voltage reference. For C
NR
= 10nF, the total noise in
the 10Hz to 100kHz bandwidth is reduced by approximately
a factor of 3.5, as shown in Figure 8.
FIGURE 7. Block Diagram.
Over Current
Over Temp
Protection
V
(1.295V)
Low Noise
Charge Pump
DMOS
Output
R
1
NOTE: R
and R
are internal
on fixed output versions.
V
OUT
Adj
(Adjustable
Versions)
R
2
NR
(fixed output
versions only)
ENABLE
REG103
V
IN
ERROR
C
(optional)
FIGURE 8. Output Noise versus Noise-Reduction Capacitor.
0.001
0.01
0.1
1
45
35
25
O
(
μ
V
R
C
NR
(
μ
F)
C
OUT
= 0
C
OUT
= 10
μ
F
FIGURE 9. Output Noise Density on Adjustable Versions.
100
10
1000
10000
100000
10.0
1.0
0.1
n
√
H
Frequency
C
OUT
= 0, C
FB
= 0
C
OUT
= 0, C
= 0.01
μ
F
C
OUT
= 10
μ
F, C
FB
= 0.01
μ
F
The REG103 adjustable version does not have the noise-
reduction pin available, however, the adjust pin is the sum-
ming junction of the error amplifier. A capacitor, C
FB
,
connected from the output to the adjust pin will reduce both
the output noise and the peak error from a load transient.
Figure 9 shows improved output noise performance for two
capacitor combinations.
The REG103 utilizes an internal charge pump to develop an
internal supply voltage sufficient to drive the gate of the
DMOS pass element above V
IN
. The charge-pump switch-
ing noise (nominal switching frequency = 2MHz) is not
measurable at the output of the regulator.
DROP-OUT VOLTAGE
The REG103 uses an N-channel DMOS as the “pass”
element. When the input voltage is within a few hundred
millivolts of the output voltage, the DMOS device behaves
like a resistor. Therefore, for low values of V
IN
to V
OUT
, the
regulator’s input-to-output resistance is the Rds
ON
of the
DMOS pass element (typically 230m
)
. For static (DC)
loads, the REG103 will typically maintain regulation down
to V
IN
to V
OUT
voltage drop of 115mV at full-rated output
current. In Figure 10, the bottom line (DC dropout) shows
the minimum V
IN
to V
OUT
voltage drop required to prevent
drop-out under DC load conditions.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| REG103-27 | DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-3 | DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-33 | DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-5 | DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-A | DMOS 500mA Low Dropout (LDO) Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REG103-27 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DMOS 500mA Low Dropout (LDO) Regulator |
| REG103-A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DMOS 500mA Low Dropout (LDO) Regulator |
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