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PDF UCC1926 Data sheet ( Hoja de datos )
| Número de pieza | UCC1926 | |
| Descripción | +-20A Integrated Current Sensor | |
| Fabricantes | Unitrode | |
| Logotipo |  |
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± 20A Integrated Current Sensor
application
INFO
available
UCC1926
UCC2926
UCC3926
FEATURES
• Integral Non-inductive Current Sense
Element with Internal Kelvin
Connections
• 20A Current Rating
• Bi-directional, High Side or Low Side
Sensing
• Internal Temperature Nulling Circuitry
for Current Sense Element and
Amplifier
• Logic Compatible Current Direction
Status Output
• Low Offset, Chopper Stabilized
Current Sense Amplifier
• Uncommitted Amplifier with User
Programmable Gain
• Overcurrent Indication with User
Programmable Threshold
DESCRIPTION
The UCC3926 Current Sensor IC contains a wideband, transimpedance
amplifier for converting the current through an internal, non-inductive
1.3mΩ shunt resistor into a proportional voltage. The sense element oper-
ates in both high-side (VDD referenced) and low-side (GND referenced) ap-
plications.
The UCC3926 can measure currents up to ±20A. This transimpedance am-
plifier gain is precisely trimmed to 33.3mΩ to convert a 15A input into a
500mV output signal. It has a very low input offset voltage from chop-
per-stabilization. A cross-switching block rectifies the input signal by forcing
the differential output, AOP positive with respect to the other differential
output, AON. SIGN indicates the polarity of the current.
The UCC3926 programmable amplifier provides three functions. It converts
the differential transimpedance output signal into a single-ended signal. It
has a user-controlled gain stage that sets the maximum current level to the
desired voltage and it level shifts the zero current point to the desired level
as well. A comparator then compares the output of the instrumentation am-
plifier to a user-set reference voltage on OCREF, which provides an
overcurrent status bit OC.
The UCC3926 is available in the 16 pin SOIC package.
BLOCK DIAGRAM
SLUS266A - OCTOBER 1999
UDG-97139-1
1 page  
LAB EVALUATION CIRCUIT
The circuit shown uses a pulse generator to switch cur-
rents while observing the analog voltage of the sensed
current. A four position switch can be used to experiment
UCC1926
UCC2926
UCC3926
with different gain settings for the programmable ampli-
fier. The OCREF voltage and the NI DC bias voltage can
be adjusted with 1kΩ potentiometers to offset the ampli-
fier output and set the overcurrent comparator threshold.
+10V
10kΩ
10µF
PULSE
GENERATOR
10Ω
0.027µF
VS
1k
13
4
1
2
3
VDD GND +5V
1k
1k
SW1
SW2
10kΩ
10kΩ
10kΩ
0.027µF
+5V
1k
1k
14
15
16
7
8
10
0.027µF
SIGN COMPARATOR
TRANSIMPENDANCE
AMPLIFIER rm=3.33mΩ
+
–
6
1.3mΩ
IMAX=20A
SEL 5
CROSS
SWITCH
12
100pF
PROGRAMMABLE AMPLIFIER
OVERCURRENT
COMPARATOR
+
–
10kΩ
10kΩ
10kΩ
SW3
10kΩ
SW4
100pF
9 OUT
11
UDG-97158
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet UCC1926.PDF ] | |
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