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參數(shù)資料
| 型號： | UCD7230_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital Control Compatible Synchronous Buck Gate Drivers with Current Sense Conditioning Amplifier |
| 中文描述： | 數(shù)字控制兼容同步降壓門驅(qū)動器，電流調(diào)節(jié)放大器檢測 |
| 文件頁數(shù)： | 13/33頁 |
| 文件大小： | 874K |
| 代理商： | UCD7230_07 |
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www.ti.com
48
1
8 33
POS
A
R
k
=
÷
+
W
è
0
500
1500
2000
R
POS
-
W
49
1000
A
Current Sense AMP Gain
vs
RPOS
Normal Gain
Minimum Gain Corner
(minimum sheet and hot
temperature)
Maximum Gain Corner
(minimum sheet and Cold
temperature)
48
47
46
45
44
43
42
41
40
39
38
37
36
35
UCD7230
SLUS741C–NOVEMBER 2006–REVISED MARCH 2007
APPLICATION INFORMATION (continued)
With the addition of R
POS
and R
NEG
, the natural gain, A, of the current sense is predictably decreased as:
For R
POS
<< 8.33 k
, the gain is 48. While the 400 k
and 8.33 k
are well matched, it is important to keep
R
POS
as small as possible since they have absolute variation from chip-to-chip and over temperature. The graph
in
shows the band of expected gain for A as a function of R
POS
. The gain variation at R
POS
= 1 k
results in around ±4% error. However, the tolerance of the value of R in the inductor has a more significant
effect on measurement accuracy as does the temperature coefficient of R. Copper has a temperature coefficient
of approximately 3800 ppm/°C. For a 100°C rise in winding temperature, the dc resistance of the inductor
increases by 38%. The worst case scenario would be a cracked core or under-designed inductor in which cases
the core could tend towards saturation. In that scenario, inductor current could change slope drastically and is
not correctly modeled by the capacitor voltage.
Note that inferring inductor current by use of a parallel RC has an additional caveat. As long as T
RC
= R
POS
C is
the same as T
= L/R, then the voltage across C is the same as the IR drop across the equivalent R of the
inductor. If the time constants don't match, the average voltage across C is still the same as the average voltage
across R, but the indication of ripple current amplitude will be off. Furthermore, load transients results in reported
current that appears to have overshoot or undershoot if T
RC
is respectively faster or slower than T
LR
.
While the amp faithfully passes the sensed dc current signal, it should be noted that the amplifier is bandwidth
limited for normal switching frequencies. Therefore, AO represents a moving average of the sensed current.
Figure 6. Current Sense Amp Gain as a Function of R
POS
13
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UCD7230A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Control Compatible Synchronous Buck Gate Driver with Current Sense Conditioning Amplifier |
| UCD7230ARGWR | 功能描述:功率驅(qū)動器IC Dig Pwr Comp Synch Buck Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| UCD7230ARGWT | 功能描述:功率驅(qū)動器IC Dig Pwr Comp Synch Buck Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| UCD7230PWP | 功能描述:DC/DC 開關(guān)控制器 Dig Pwr Comp Synch Buck RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| UCD7230PWPG4 | 功能描述:DC/DC 開關(guān)控制器 Dig Pwr Comp Synch Buck Drvr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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