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參數(shù)資料
| 型號： | DRV401AIRGWRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC20 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 7/36頁 |
| 文件大?。?/td> | 963K |
| 代理商： | DRV401AIRGWRG4 |
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DRV401
SBVS070B JUNE 2006 REVISED MAY 2009
www.ti.com
15
The transition from normal operation to overload happens
relatively slowly, because the inherent sensor transformer
characteristics induce the initial primary current step, as
shown in Figure 3. As the transformer-induced secondary
current starts to decay, the compensation feedback driver
increases its output voltage to maintain the sensor core
flux compensation at zero.
When the system compensation loop reaches its driving
limit, the rising magnetic flux causes one of the probe
PWM half-periods to become shorter. The minimum
half-period of the probe oscillation is limited by the internal
timing to 280ns, based on the properties of the VAC
magnetic sensors. After three consecutive cycles of the
same half-period being shorter than 280ns, the DRV401
goes into overload-latch mode. The device stores the
ICOMP driver output signal polarity and continues producing
the skewed-duty cycle PWM signal. This action prevents
the loss of compensation signal polarity information during
very strong overloads. In this case, both PWM half-periods
are short and approximately equal, because the field
probe stays completely in one of the saturated regions.
The overload-latch condition is removed after the primary
current goes low enough for the ICOMP driver to
compensate, and both half-periods of the probe driver
oscillation become longer than 280ns (the field probe
comes out of the saturated region).
Peak voltages and currents can be generated during
normal operations as well as overload conditions.
Therefore, both probe connection pins are internally
protected against coupled energy from the magnetic core.
Wiring between probe and IC inputs should be short and
guarded against interference; see Layout Considerations.
For reliable operation, error detection circuits monitor the
probe operation:
1.
If the probe driver comparator (CMP) output stays low
longer than 32
s, the ERROR flag asserts active, and
the compensation current (ICOMP) is set to zero.
2.
If the probe driver period is less than 275ns on three
consecutive pulses, the ERROR flag asserts active.
See the Error Conditions section for more details.
PWM PROCESSING
The outputs PWM and PWM represent the probe output
signal as a differential PWM signal. It can drive external
circuitry or be used for synchronous ripple reduction. The
PWM signal from the probe excitation and sense stage is
internally
connected
to
a
high-performance,
switched-capacitor
integrator
followed
by
an
integrating-differentiating filter. This filter converts the
PWM signal into a filtered delta signal and prepares it for
driving the analog compensation coil driver. The gain
roll-off frequency of the filter stage is set to provide high dc
gain and loop stability. If additional gain is added from
external circuitry, the internal gain can be reduced by 8dB,
asserting
the
GAIN
pin
high
(see
the
External
Compensation Coil Driver section).
50
s/div
1
3
4
2
Sensor: 4 x 100
R
SH =10
Step Response
2kHz In
V(Gain) = Low
Channel 1: 2V/div
Channels 24: 500mV/div
V(1
× I
PRIM/10)
I
COMP1
I
COMP2
V
OUT
A current pulse of 0A to 18A (Ch 1) generates the two ICOMP signals (Ch 3 and Ch 4). Ch 2 shows the resulting output signal,
VOUT. This test uses the M4645-X030 sensor, no bandwidth limitation, but a 20-sample average.
Figure 3. Primary Current Step Response
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DRV401AIRGWT | 功能描述:功率驅動器IC Sensor Sig Conditioning 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| DRV401AIRGWTG4 | 功能描述:功率驅動器IC Sensor Signal Conditioning 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| DRV401AMDWPREP | 功能描述:功率驅動器IC Enh Prod Sensor Sig Conditioning 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| DRV401-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SENSOR SIGNAL CONDITIONING IC FOR CLOSED-LOOP MAGNETIC CURRENT SENSOR |
| DRV401-EP_09 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SENSOR SIGNAL CONDITIONING IC FOR SENSOR SIGNAL CONDITIONING IC FOR |
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