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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)： | 12/33頁 |
| 文件大小： | 874K |
| 代理商： | UCD7230_07 |
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Current Sensing and Overload Protection
Since the UCD7230 is physically collocated with the high-current elements of the power converter, it is logical
that current be monitored by the chip. An internal instrumentation amplifier conditions current sense signals so
that they can be used by the control chip generating the PWM signal.
48
OUT
SHUNT
R
AO
(
I
) IO
+
=
′
′
POS
NEG
AO
I0
+
+
V
OUT
SW
L
8.33k
Ω
400k
Ω
8.33k
Ω
400k
Ω
CurrentSenseAmp
IO Buffer
Amp
R
SHUNT
POS
NEG
AO
I0
+
+
SW
C
L
+
R
8.33k
Ω
R
NEG
R
POS
400k
Ω
8.33k
Ω
400k
Ω
CurrentSenseAmp
IO Buffer
Amp
V
OUT
C
OUT
C
OUT
OUT
COPPER
R
AO
( A I
) IO
+
=
′
′
UCD7230
SLUS741C–NOVEMBER 2006–REVISED MARCH 2007
APPLICATION INFORMATION (continued)
POS and NEG are inputs to an instrumentation amplifier circuit. This amplifier has a nominal gain of 48 and
presents its output at AO. This can be used to monitor either an external current sense shunt or a parallel RC
around the buck inductor shown in
Figure 5
. The shunt yields the highest accuracy and will be insensitive to
inductor core saturation effects. It comes with the price of added power dissipation. Using the shunt, AO is given
by:
The internal configuration of the instrumentation amplifier is such that AO is 0.6 V when POS – NEG = 0.
Because of this output offset, the amplifier can accurately pass information for both positive and negative load
current. The offset is controlled by IO. If IO is left to float, the offset is 0.6 V. 0.6 V is present at IO through an
internal 10-k
resistor and should be bypassed to AGND. If a higher value of offset is desired, a voltage in
excess of 0.66 V can be externally applied to IO. Once IO is forced above 0.66 V, the internal 10 k
is
disconnected, and the AO output offset is now equal to the voltage applied to IO.
Figure 5. Current Sense Using External Shunt and Lossless Average Output Current Sensing Using DC
Resistance of the Output Inductor.
Figure 5
also shows lossless current sensing utilizing an RC across the buck inductor to generate an analog of
the IR drop on the copper of the inductor. As long as the R
POS
x C time constant is the same as the L/R of the
inductor and its parasitic equivalent series resistance, then the voltage on C is the same as the IR drop on the
parasitic inductor resistance. A resistor, R
NEG
= R
POS
is used for amplifier bias current cancellation. The transfer
function of the amplifier is given by:
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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