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参数资料
| 型号： | REG101 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | DMOS 100mA Low-Dropout Regulator |
| 中文描述： | 的DMOS 100mA的低压差稳压器 |
| 文件页数： | 12/15页 |
| 文件大小： | 277K |
| 代理商： | REG101 |
REG101
SBVS026C
12
FIGURE 6. Transient and DC Dropout.
DROP-OUT VOLTAGE
The REG101 uses an N-channel DMOS as the “pass”
element. When the input voltage is within a few tens of
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 600m
)
. For static (DC)
loads, the REG101 will typically maintain regulation down
to V
IN
to V
OUT
voltage drop of 60mV at full rated output
current. In Figure 6, the bottom line (DC dropout) shows the
minimum V
IN
to V
OUT
voltage drop required to prevent
drop-out under DC load conditions.
For large step changes in load current, the REG101 requires
a larger voltage drop across it to avoid degraded transient
response. The boundary of this “transient drop-out” region is
shown as the top line in Figure 6. Values of V
IN
to V
OUT
voltage drop above this line insure normal transient re-
sponse.
In the transient dropout region between “DC” and “Tran-
sient”, transient response recovery time increases. The time
required to recover from a load transient is a function of both
the magnitude and rate of the step change in load current and
the available “headroom” V
IN
to V
OUT
voltage drop. Under
worst-case conditions (full-scale load change with V
IN
to
V
OUT
voltage drop close to DC dropout levels), the REG101
can take several hundred microseconds to re-enter the speci-
fied window of regulation.
TRANSIENT RESPONSE
The REG101 response to transient line and load conditions
improves at lower output voltages. The addition of a capaci-
tor (nominal value 0.47
μ
F) from the output pin to ground
may improve the transient response. In the adjustable ver-
sion, the addition of a capacitor, C
FB
(nominal value 10nF),
from the output to the adjust pin will also improve the
transient response.
THERMAL PROTECTION
The REG101 has thermal shutdown circuitry that protects
the regulator from damage. The thermal protection circuitry
disables the output when the junction temperature reaches
approximately 160
°
C, allowing the device to cool. When the
junction temperature cools to approximately 140
°
C, the
output circuitry is again enabled. Depending on various
conditions, the thermal protection circuit may cycle on and
off. This limits the dissipation of the regulator, but may have
an undesirable effect on the load.
Any tendency to activate the thermal protection circuit
indicates excessive power dissipation or an inadequate heat
sink. For reliable operation, junction temperature should be
limited to 125
°
C, maximum. To estimate the margin of
safety in a complete design (including heat sink), increase
the ambient temperature until the thermal protection is
triggered. Use worst-case loads and signal conditions. For
good reliability, thermal protection should trigger more than
35
°
C above the maximum expected ambient condition of
your application. This produces a worst-case junction tem-
perature of 125
°
C at the highest expected ambient tempera-
ture and worst-case load.
The internal protection circuitry of the REG101 has been
designed to protect against overload conditions. It was not
intended to replace proper heat sinking. Continuously run-
ning the REG101 into thermal shutdown will degrade reli-
ability.
140
120
100
80
60
40
20
0
D
0
25
50
75
100
150
125
I
OUT
(mA)
DC
Full Scale I
OUT
Transient
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PDF描述 |
|---|---|
| REG102UA-2.8 | DMOS 250mA Low-Dropout Regulator |
| REG102UA-2.85 | DMOS 250mA Low-Dropout Regulator |
| REG102GA-2.8 | DMOS 250mA Low-Dropout Regulator |
| REG102 | DMOS 250mA Low-Dropout Regulator |
| REG113 | DMOS 400mA Low-Dropout Regulator(DMOS 400mA 低压差稳压器) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| REG101_05 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DMOS 100mA Low-Dropout Regulator |
| REG101-25 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 100mA Low Dropout (LDO) Regulator |
| REG101-28 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 100mA Low Dropout (LDO) Regulator |
| REG101-285 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 100mA Low Dropout (LDO) Regulator |
| REG101-3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 100mA Low Dropout (LDO) Regulator |
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