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參數資料
| 型號： | RC2951M |
| 英文描述： | Fixed & Adjustable Voltage Regulator |
| 中文描述： | 固定 |
| 文件頁數： | 6/11頁 |
| 文件大?。?/td> | 213K |
| 代理商： | RC2951M |
RC2951
PRODUCT SPECIFICATION
6
REV. 1.0.0 2/8/01
.
** Drive with TTL-high to shut down. Ground or leave open if shutdown feature is not to be used.
Figure 2. Adjustable Regulator
The complete equation for the output voltage is
Adding the error term,
where V
REF
is the nominal 1.235 reference voltage and I
FB
is the feedback pin bias current, nominally -20 nA. The
minimum recommended load current of 1
μ
A forces an
upper limit of 1.2 M
on the value of R
2
, if the regulator
must work with no load (a condition often found in CMOS in
standby). I
FB
will produce a 2% typical error in V
OUT
which
may be eliminated at room temperature by trimming R
1
.
For better accuracy, choosing R
2
= 100k reduces this error
to 0.17% while increasing the resistor program current to
12
μ
A. Since the RC2951 typically draws 60
μ
A at no load
with Pin 2 open-circuited, this is a small price to pay.
Reducing Output Noise
In reference applications it may be advantageous to reduce
the AC noise present at the output. One method is to reduce
the regulator bandwidth by increasing the size of the output
capacitor.
Noise can be reduced fourfold by a bypass capacitor across
R
1
, since it reduces the high frequency gain from 4 to unity.
Pick
2
R
1
200Hz
or about 0.01
μ
F. When doing this, the output capacitor must
be increased to 3.3
μ
F to maintain stability. These changes
reduce the output noise from 430
μ
V to 100
μ
V rms for a
100 kHz bandwidth at 5V output. With the bypass capacitor
added, noise no longer scales with output voltage so that
improvements are more dramatic at higher output voltages.
RC2951
3.3
μ
F
100K
Error
Output
ERROR
**Shutdown
Input
1.23V
1.2
30V
7
4
1
8
5
3
.01
μ
F
+
+
R
2
R
1
V
REF
+V
IN
+V
IN
V
OUT
V
OUT
SD
GND
FB
2950-11
V
OUT
V
REF
1
R
1
R
2
------
+
=
V
OUT
V
REF
1
R
1
R
2
------
+
I
FB
R
1
+
=
V
R
2
-------------
V
R
1
+
R
2
-------------------
=
V
OUT
V
REF
R
-------------------
R
2
+
R
2
=
V
OUT
V
REF
1
R
1
R
2
------
+
=
V
OUT
V
REF
1
R
1
R
2
------
+
I
FB
R
2
+
=
C
BYPASS
---------------1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| RC2951M_32 | 功能描述:上下轉換器 RoHS:否 制造商:Texas Instruments 產品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| RC2951M-3.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fixed & Adjustable Voltage Regulator |
| RC2951M33 | 功能描述:線性穩(wěn)壓器 - 標準 RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調節(jié): 最大輸入電壓:5.5 V 線路調整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| RC2951M33_32 | 功能描述:上下轉換器 RoHS:否 制造商:Texas Instruments 產品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| RC2951MT | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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