參數(shù)資料
型號(hào)： DRV401AIRGWRG4
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQCC20
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-20
文件頁(yè)數(shù)： 9/36頁(yè)
文件大?。?/td> 963K
代理商： DRV401AIRGWRG4
DRV401
SBVS070B JUNE 2006 REVISED MAY 2009
www.ti.com
17
SHUNT SENSE AMPLIFIER
The differential (H-bridge) driver arrangement for the
compensation coil requires a differential sense amplifier
for the shunt voltage. This differential amplifier offers wide
bandwidth and a high slew rate for fast current sensors.
Excellent dc stability and accuracy result from an
auto-zero technique. The voltage gain is 4V/V, set by
precisely matched and stable internal SiCr resistors.
Both inputs of the differential amplifier are normally
connected to the current shunt resistor. This resistor adds
to the internal (10k
) resistor, slightly reducing the gain in
this leg. For best common-mode rejection (CMR), a
dummy shunt resistor (R5) is placed in series with the
REFIN pin to restore matching of both resistor dividers, as
shown in Figure 5a.
For gains of 4V/V:
4
+
R
2
R
1
+
R
4
) R
5
R
SHUNT
) R
3
With R2/R1 = R4/R3 = 4; R5 = RSHUNT
× 4
Typically, the gain error resulting from the resistance of
RSHUNT is negligible; for 70dB of common-mode rejection,
however, the match of both divider ratios needs to be better
than 1/3000.
The amplifier output can drive close to the supply rails, and
is designed to drive the input of a SAR-type ADC; adding
an RC low-pass filter stage between the DRV401 and the
ADC is recommended. This filter not only limits the signal
bandwidth
but
also
decouples
the
high-frequency
component of the converter input sampling noise from the
amplifier output. For RF and CF values, refer to the specific
converter recommendations in the specific product data
sheet. Empirical evaluation may be necessary to obtain
optimum results.
The output can drive 100pF directly and shows 50%
overshoot with approximately 1nF capacitance. Adding RF
allows much larger capacitive loads, as shown in
Figure 5b and Figure 5c. Note that with RF of only 20
, the
load capacitor should be either smaller than 1nF or larger
than 33nF to avoid overshoot; with RF of 50
this transient
area is avoided.
a) Internal difference amplifier with an example of a decoupling filter.
10
s/div
20
mV
/di
v
b) VOUT of Figure 5a with R5 = 20 and CD = 100nF.
10
s/div
20
mV
/di
v
c) VOUT of Figure 5a with R5 = 50 and CD = 10nF.
R
2
40k
R
1
10k
R
4
40k
R
3
10k
R
5
Dummy
Shunt
Differential
Amplifier
R
F
50
Decoupling, LowPass Filter
REF
IN
Compensated
REF
IN
ADC
V
OUT
C
F
10nF
R
SHUNT
I
COMP2
K2
DRV401 Differential Amplifier Section
NOTE: R
5 is a dummy shunt resistor equal to 4x RSHUNT to compensate for RSHUNT and provide best CMR.
Figure 5. Internal Difference Amplifier with Example of a Decoupling Filter
(2)
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