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參數(shù)資料
| 型號： | LTC1966MPMS8#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | RMS TO DC CONVERTER, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 2/38頁 |
| 文件大小： | 387K |
| 代理商： | LTC1966MPMS8#TRPBF |
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LTC1966
10
1966fb
applicaTions inForMaTion
The last two entries of Table 1 are chopped sine waves as
is commonly created with thyristors such as SCRs and
Triacs. Figure 2a shows a typical circuit and Figure 2b
shows the resulting load voltage, switch voltage and load
currents. The power delivered to the load depends on the
firing angle, as well as any parasitic losses such as switch
ON voltage drop. Real circuit waveforms will also typically
have significant ringing at the switching transition, depen-
dent on exact circuit parasitics. For the purposes of this
data sheet, SCR waveforms refers to the ideal chopped
sine wave, though the LTC1966 will do faithful RMS-to-DC
conversion with real SCR waveforms as well.
The case shown is for
Θ = 90°, which corresponds to 50%
of available power being delivered to the load. As noted in
Table 1, when
Θ = 114°, only 25% of the available power
is being delivered to the load and the power drops quickly
as
Θ approaches 180°.
With an average rectification scheme and the typical
calibration to compensate for errors with sine waves, the
RMS level of an input sine wave is properly reported; it
is only with a nonsinusoidal waveform that errors occur.
Because of this calibration, and the output reading in
VRMS, the term true RMS got coined to denote the use of
an actual RMS-to-DC converter as opposed to a calibrated
average rectifier.
RMS-TO-DC CONVERSION
Definition of RMS
RMS amplitude is the consistent, fair and standard way to
measure and compare dynamic signals of all shapes and
sizes. Simply stated, the RMS amplitude is the heating
potential of a dynamic waveform. A 1VRMS AC waveform
will generate the same heat in a resistive load as will 1V DC.
Figure 1
Mathematically, RMS is the root of the mean of the square:
VV
RMS =
2
Alternatives to RMS
Other ways to quantify dynamic waveforms include peak
detection and average rectification. In both cases, an aver-
age (DC) value results, but the value is only accurate at
the one chosen waveform type for which it is calibrated,
typically sine waves. The errors with average rectification
are shown in Table 1. Peak detection is worse in all cases
and is rarely used.
Table 1. Errors with Average Rectification vs True RMS
WAVEFORM
VRMS
AVERAGE
RECTIFIED
(V)
ERROR*
Square Wave
1.000
11%
Sine Wave
1.000
0.900
*Calibrate for 0% Error
Triangle Wave
1.000
0.866
–3.8%
SCR at 1/2 Power,
Θ = 90°
1.000
0.637
–29.3%
SCR at 1/4 Power,
Θ = 114°
1.000
0.536
–40.4%
Figure 2a
Figure 2b
+– R
1V DC
R
1966 F01
SAME
HEAT
1V ACRMS
R
1V (AC + DC) RMS
CONTROL
VLOAD
AC
MAINS
VLINE
VTHY
1966 F02a
+
–
+
–
ILOAD
VLINE
Θ
VLOAD
VTHY
ILOAD
1966 F02b
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| LTC1967CMS8 | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標準包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8#PBF | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標準包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8#TR | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標準包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8#TRPBF | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標準包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8PBF | 制造商:Linear Technology 功能描述:RMS-DC converter, LTC1967 40kHz MSOP |
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