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ISL28005 Datenblatt(PDF) 9 Page - Intersil Corporation

Teilenummer ISL28005
Bauteilbeschribung  Micropower, Rail-to-Rail Input Current Sense Amplifier with Voltage Output
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Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL28005 Datenblatt(HTML) 9 Page - Intersil Corporation

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9
FN6973.2
May 27, 2010
Applications Information
Functional Description
The ISL28005-20, ISL28005-50 and ISL28005-100 are
single supply, uni-directional current sense amplifiers
with fixed gains of 20V/V, 50V/V and 100V/V
respectively.
The ISL28005 is a 2-stage amplifier. Figure 16 shows the
active circuitry for high-side current sense applications
where the sense voltage is between 1.35V to 28V.
Figure 17 shows the active circuitry for ground sense
applications where the sense voltage is between 0V to
1.35V.
The first stage is a bi-level trans-conductance amp and
level translator. The gm stage converts the low voltage
drop (VSENSE) sensed across an external milli-ohm
sense resistor, to a current (@ gm = 21.3µA/V). The
trans-conductance amplifier forces a current through R1
resulting to a voltage drop across R1 that is equal to the
sense voltage (VSENSE). The current through R1 is
mirrored across R5 creating a ground-referenced voltage
at the input of the second amplifier equal to VSENSE.
The second stage is responsible for the overall gain and
frequency response performance of the device. The fixed
gains (20, 50, 100) are set with internal resistors Rf and
Rg. The only external component needed is a current
sense resistor (typically 0.001Ω to 0.01Ω, 1W to 2W).
The transfer function is given in Equation 1.
The input gm stage derives its ~2.86µA supply current
from the input source through the RS+ terminal as long
as the sensed voltage at the RS+ pin is >1.35V and the
gmHI amplifier is selected. When the sense voltage at
RS+ drops below the 1.35V threshold, the gmLO
amplifier kicks in and the gmLO output current reverses,
flowing out of the RS- pin.
FIGURE 13. SLEW RATE, ts, SATURATION RECOVERY
TIME
FIGURE 14. GAIN vs FREQUENCY
FIGURE 15. SLEW RATE
Test Circuits and Waveforms (Continued)
RS+
VCC
RS-
VOUT
OUT
RL
GND
VRS-
VRS+
1M
Ω
PULSE
GENERATOR
RS+
VCC
RS-
VOUT
OUT
RL
GND
VSENSE
VRS+
1M
Ω
SIGNAL
GENERATOR
RS+
VCC
RS-
VOUT
OUT
RL
GND
VRS+
1M
Ω
PULSE
GENERATOR
VOUT
GAIN
ISRS VOS
+
()
×
=
(EQ. 1)
ISL28005


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