- 您现在的位置：买卖IC网 > PDF目录376305 > REG102 (Texas Instruments, Inc.) DMOS 250mA Low-Dropout Regulator PDF资料下载
参数资料
| 型号： | REG102 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | DMOS 250mA Low-Dropout Regulator |
| 中文描述： | 的DMOS 250mA的低压差稳压器 |
| 文件页数： | 12/19页 |
| 文件大小： | 342K |
| 代理商： | REG102 |
REG102
SBVS024E
12
www.ti.com
FIGURE 6. Transient and DC Dropout.
350
300
250
200
150
100
50
0
D
0
50
100
150
200
DC
250
I
OUT
(mA)
DROPOUT VOLTAGE vs I
OUT
0mA to I
OUT
Transient
DROPOUT VOLTAGE
The REG102 uses an N-channel DMOS as the pass element.
When (V
IN
–
V
OUT
) is less than the drop-out voltage (V
DROP
),
the DMOS pass device behaves like a resistor; therefore, for
low values of (V
IN
–
V
OUT
), the regulator input-to-output
resistance is the Rds
ON
of the DMOS pass element (typically
600m
). For static (DC) loads, the REG102 typically main-
tains regulation down to a (V
IN
–
V
OUT
) voltage drop of 150mV
at full rated output current. In Figure 6, the bottom line (DC
dropout) shows the minimum V
IN
to V
OUT
voltage drop re-
quired to prevent dropout under DC load conditions.
For large step changes in load current, the REG102 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 and values of V
IN
to V
OUT
voltage drop above this line insure normal transient re-
sponse.
case conditions (full-scale load change with (V
IN
–
V
OUT
)
voltage drop close to DC dropout levels), the REG102 can
take several hundred microseconds to re-enter the specified
window of regulation.
TRANSIENT RESPONSE
The REG102 response to transient line and load conditions
improves at lower output voltages. The addition of a capacitor
(nominal value 0.47
μ
F) from the output pin to ground can
improve the transient response. In the adjustable version, the
addition of a capacitor, C
FB
(nominal value 10nF), from the
output to the adjust pin can also improve the transient
response.
THERMAL PROTECTION
Power dissipated within the REG102 can cause the junction
temperature to rise. The REG102 has thermal shutdown
circuitry that protects the regulator from damage which dis-
ables 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 out-
put circuitry is again enabled. Depending on various condi-
tions, the thermal protection circuit can cycle on and off. This
limits the dissipation of the regulator, but can have an
undesirable effect on the load.
Any tendency to activate the thermal protection circuit indi-
cates excessive power dissipation or an inadequate heat
sink. For reliable operation, junction temperature must 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 reliabil-
ity, thermal protection should trigger more than 35
°
C above
the maximum expected ambient condition of the application.
This produces a worst-case junction temperature of 125
°
C at
the highest expected ambient temperature and worst-case
load.
The internal protection circuitry of the REG102 is designed to
protect against overload conditions and is not intended to
replace proper heat sinking. Continuously running the REG102
into thermal shutdown will degrade reliability.
In the transient dropout region between DC and Transient,
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-
相关PDF资料 |
PDF描述 |
|---|---|
| REG113 | DMOS 400mA Low-Dropout Regulator(DMOS 400mA 低压差稳压器) |
| REG5601 | 18-Line SCSI Active Terminator(18线SCSI有源终端) |
| REG5608 | Low Capacitance 18-Line SCSI Active Terminator(低电容的18线SCSI有源终端) |
| REG710 | 60MA SWITCHED CAP BUCK/BOOST CONVERTER |
| REJ03C0098_R1LV0408C | Wide Temperature Range Version 4M SRAM (512-kword 】 8-bit) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| REG102_07 | 制造商:BB 制造商全称:BB 功能描述:DMOS 250mA Low-Dropout Regulator |
| REG102_08 | 制造商:BB 制造商全称:BB 功能描述:DMOS 250mA Low-Dropout Regulator |
| REG102-25 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 250 mA Low Dropout (LDO) Regulator |
| REG102-28 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 250 mA Low Dropout (LDO) Regulator |
| REG102-285 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DMOS 250 mA Low Dropout (LDO) Regulator |
发布紧急采购，3分钟左右您将得到回复。