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参数资料
| 型号： | ISL55291IUZ-T13 |
| 厂商： | INTERSIL CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Single and Dual Ultra-Low Noise, Ultra-Low Distortion, Rail-to-Rail, Low Power Op Amp |
| 中文描述： | DUAL OP-AMP, 800 uV OFFSET-MAX, 800 MHz BAND WIDTH, PDSO10 |
| 封装： | ROHS COMPLIANT, MSOP-10 |
| 文件页数： | 15/18页 |
| 文件大小： | 886K |
| 代理商： | ISL55291IUZ-T13 |
15
FN6263.1
March 30, 2007
Current Sense Application Circuit
The schematic in Figure 44 provides an example of utilizing
the ISL55191 high speed performance with the ground
sensing input capability to implement a single-supply, G = 10
differential low side current sense amplifier. The reference
voltage applied to V
REF
(+2.5V) defines the amplifier output
0A current sense reference voltage at one half the supply
voltage level (V
S
= +5VDC), and R
SENSE
sets the current
sense gain and full scale values. In this example the current
gain is 10A/V over a maximum current range of slightly less
than ±25A with R
SENSE
= 0.01
Ω
. The amplifier V
IO
error
(800μV max) and input bias offset current I
IO
error (0.7μA)
together contribute less than 10mV (100mA) at the output for
better than 0.2% full scale accuracy.
The amplifier’s high slew rate and fast pulse response make
this circuit suitable for low-side current sensing in PMWM
and motor control applications. The excellent input overload
recovery response enables the circuit to maintain
performance in the presence of parasitic inductance that
cause fast rise and falling edge spikes that can momentarily
overload the input stage of the amplifier.
R
SENSE
Ω
R
F
10k
Ω
IN-
FEEDBACK
IN+
ISL55191
R
L
R
T
OUT
V-
V+
+5VDC
PARASITIC
L TO R
VOUT
CURRENT
INPUT
CURRENT
INPUT
R
G+
100
Ω
R
G-
100
R
REF
10k
Ω
FIGURE 44. GROUND SIDE CURRENT SENSE AMPLIFIER
V
+2.5V
ISL55191, ISL55291
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