UCC1926 [TI]
【 20A Integrated Current Sensor; 【 20A集成电流传感器
| 型号： | UCC1926 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 【 20A Integrated Current Sensor |
| 文件： | 总9页 (文件大小：262K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
application
INFO
UCC1926
UCC2926
UCC3926
available
±20A Integrated Current Sensor
FEATURES
DESCRIPTION
• Integral Non-inductive Current Sense
Element with Internal Kelvin
Connections
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.
• 20A Current Rating
• Bi-directional, High Side or Low Side
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.
Sensing
• Internal Temperature Nulling Circuitry
for Current Sense Element and
Amplifier
• Logic Compatible Current Direction
Status Output
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.
• Low Offset, Chopper Stabilized
Current Sense Amplifier
• Uncommitted Amplifier with User
Programmable Gain
• Overcurrent Indication with User
Programmable Threshold
The UCC3926 is available in the 16 pin SOIC package.
BLOCK DIAGRAM
UDG-97139-1
SLUS266A - OCTOBER 1999
UCC1926
UCC2926
UCC3926
CONNECTION DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Input Sense Current (IIN) . . . . . . . . . . . . . . . . . . . . . . . . . ± 20A
Supply Voltage, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5V
Inrush Current, 50µs . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100A
Input Voltage Range (CSP, CSN) . . . . . . . . . . . –0.2V to 14.5V
CSP, CSN, Common Mode Range
SOIC-16 (Top View)
DS Package
(referenced to GND) . . . . . . . . . . . . . . . . . . . . . . . . . ± 200mV
CSP, CSN, Common Mode Range
(referenced to VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . ± 200mV
Shunt Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.25mΩ
Storage Temperature . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . . –55°C to 150°C
Lead Temperature (Soldering, 10sec.) . . . . . . . . . . . . . . 300°C
Currents are positive into, negative out of the specified termi-
nal. Consult Packaging Section of Databook for thermal limita-
tions and considerations of packages.
ORDERING INFORMATION
TEMPERATURE RANGE
– 55°C to +125°C
– 40°C to +85°C
PACKAGES
UCC1926
UCC2926
UCC3926
DS
DS
DS
0°C to +70°C
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for VDD = 4.8V; all temperature
ranges and TA = TJ.
PARAMETER
Supply Section
TEST CONDITIONS
MIN
TYP MAX UNITS
VDD
IVDD
4.8
14
6
V
mA
3.8
Transimpedance Amplifier Section
AOP – AON
IIN = 15A, VDD = 10V, 25°C
IIN = 15A, VDD = 10V, 0°C to +70°C
IIN = 15A, VDD = 10V, –40°C to +85°C
490
480
460
410
500
500
500
500
1.0
0
510
520
540
590
mV
mV
mV
mV
V
I
I
IN = 15A, VDD = 10V, –55°C to +125°C
IN = 0
Quiescent Output Voltage (AOP, AON)
Quiescent Differential Voltage (AOP –
IIN = 0, Measure AC Peak to Peak
30
mV
AON)
Bandwidth
(Note 1)
20
40
350
1.3
MHz
Ω
mΩ
dB
Output Impedance
Shunt Resistance
PSRR
500
CSP to CSN
VDD = 4.8V to 10V
VDD = 10V to 14V
(Note 1)
45
25
–200
dB
Temperature Coefficient
Sign Comparator Section
VOH, VDD – SIGN
200 ppm/°C
CSP = 1A, ISIGN = –100µA, CSN = 0V
CSP = –1A, ISIGN = 100µA, CSN = 0V
Ramp CSP, CSN = 0V
0.2
0.2
400
0.4
0.4
700
V
V
mA
mA
V
OL, SIGN
I
IH Threshold
IIL Threshold
Ramp CSP, CSN = 0V
–400 –700
Programmable Amplifier Section
AVOL
GBW
VIO
60
6
–9
70
13
9
dB
MHz
mV
At 200kHz
VIN = 0.5V, 1.5V, 2.5V
2
UCC1926
UCC2926
UCC3926
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for VDD = 4.8V; all temperature
ranges and TA = TJ.
PARAMETER
Programmable Amplifier Section (cont.)
PSRR
TEST CONDITIONS
MIN
TYP MAX UNITS
VDD = 4.8V to 10V
DD = 10V to 14V
60
60
dB
dB
V
Common Mode Input Range
IIB, Input Bias Current (NI, INV)
IIO, Input Offset Current
VOL
0.5
2.5
V
nA
nA
mV
mV
V
V
mA
µA
–100 –350
20
100
150
1.2
7
350
200
300
2
INV – NI = 20mV, IO = 0µA
INV – NI = 20mV, IO = 200µA
NI – INV = 20mV, IO = –200µA, (VDD – OUT)
NI – INV = 20mV, VDD = 14V
OUT = 1.5V
VOH
V
OH, Clamp
6
1
8
IOL
IOH
3.5
OUT = 1.5V
– 250 – 325
Overcurrent Comparator Section
OC Comp Threshold
Common Mode Range
OCREF = 2V
(Note 1)
2.00
0.1
2.05
VDD–
2
V
V
Hysteresis
VOL
VOH, VDD – OC
Propagation Delay
20
40
0.2
0.2
90
60
mV
V
V
(OCREF – OUT) = 100mV, IOC = 100µA
(OUT – OCREF) = 100mV, IOC = –100µA
(OUT – OCREF) = ±100mV
0.4
0.4
175
ns
Note 1: Guaranteed by design. Not 100% tested in prodcution.
PIN DESCRIPTIONS
sensing or to VDD for high side sensing. CSP – CSN
may vary from ±75mV from either GND or VDD. Current
into CSN is defined as negative.
AOP: Positive output of the converted current signal.
Voltage from AOP to AON is the absolute value of the
transimpedance amplifier output. AOP may show some
“chopping” noise. The differential to single-ended
conversion removes the common-mode noise between
AOP and AON.Some high frequency filtering of AOP to
GND can reduce the fast transient spikes. The output
stage of AOP is shown in Figure 1.
CSP: Input connection to the other end of the internal
current sense shunt resistor. Nominal resistance from
CSP to CSN is 1.3mW. The current shunt has a nominal
temperature coefficient of 3530 ppm/°C. The temperature
adjusted autozero gain should cancel this temp co. effect.
CSP may be referenced to GND for low side sensing or
to VDD for high side sensing. CSP – CSN may vary from
±75mV from either GND or VDD. Current into CSP is
defined as positive.
AON: Negative output of the converted current signal.
Voltage from AOP to AON is the absolute value of the
transimpedance amplifier output. AON may show some
“chopping” noise. The differential to single-ended
conversion removes the common-mode noise between
AOP and AON. Some high frequency filtering of AON to
GND can reduce the fast transient spikes. Note that AON
is above GND voltage. The output stage of AON is shown
in Figure 1.
VDD
CROSS SWITCH
IMPEDANCE
CSN: Input connection to one end of the internal current
sense shunt resistor. Nominal resistance from CSP to
CSN is 1.3mΩ. The current shunt has a nominal
temperature coefficient of 3530 ppm/°C. The temperature
adjusted autozero gain is designed to cancel this temp
co. effect. CSN may be referenced to GND for low side
AOP, AON
100
15K
250µA
ESD DIODE
Figure 1. AOP and AON output stage.
3
UCC1926
UCC2926
UCC3926
PIN DESCRIPTIONS (cont.)
Use this opamp to establish overall gain and nominal
zero current reference voltage. This amplifier may be
configured with a gain of one or more. Any non-common
mode “chopping” noise between AOP and AON will show
up at OUT. Some filtering of OUT may improve the appli-
cation’s performance.
GND: This pin is the return point for all device currents.
INV: Negative input to the programmable amplifier to
provide differential to single-ended signal conversion.
NI: Positive input to the programmable amplifier to
provide differential to single-ended signal conversion.
OC: Overcurrent comparator output. When OUT is
greater than OCREF, OC switches high. The OC
comparator has a typical hysteresis of 25mV.
SIGN: Sign comparator output. SIGN also controls the
analog switches in the cross-switching block to keep
AOP greater than AON. At currents near zero amps, the
sign comparator may switch from “chopping” noise from
the transimpedance amplifier.
OCREF: The reference pin of overcurrent comparator for
setting overcurrent threshold voltage.
VDD: VDD is the power input connection for this device.
Its input range is from 4.8V to 14V. Bypass to GND using
good quality ceramic capacitors.
OUT: Output of the programmable amplifier intended to
provide differential to single-ended signal conversion of
the transimpedance amplifier's outputs.
TYPICAL CHARACTERISTICS CURVES
700
600
500
400
300
200
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
LIMIT OF RESOLUTION
(SIGN LIMIT
THRESHOLD BAND)
100
0
-20
-15
-10
-5
0
5
10
15
20
-75
-50
-25
0
25
50
75
100
125
INPUT CURRENT [A]
TEMPERATURE [°C]
Figure 2. Differential output voltage (AOP-AON) vs.
input current (IIN).
Figure 3. Quiescent AOP, AON output voltage vs.
temperature.
1.800
1.700
1.600
1.500
1.400
1.300
1.200
1.100
1.000
0.900
0.800
620
IIN = 15A
600
VDD = 14V
580
560
540
VDD = 12V
520
VDD = 10V
500
VDD = 4.8V
480
-75
-50
-25
0
25
50
75
100
125
-75
-50
-25
0
25
50
75
100
125
TEMPERATURE [°C]
TEMPERATURE [°C]
Figure 4. Differential output voltage (AOP - AON) vs.
VDD and temperature.
Figure 5. Typical shunt resistance vs. temperature.
4
UCC1926
UCC2926
UCC3926
LAB EVALUATION CIRCUIT
The circuit shown uses a pulse generator to switch cur- with different gain settings for the programmable ampli-
rents while observing the analog voltage of the sensed fier. The OCREF voltage and the NI DC bias voltage can
current. A four position switch can be used to experiment
be adjusted with 1kΩ potentiometers to offset the ampli-
fier output and set the overcurrent comparator threshold.
10kΩ
+10V
13
10µF
0.027µF
4
VS
1k
SIGN COMPARATOR
1
2
3
TRANSIMPENDANCE
AMPLIFIER rm=3.33mΩ
+
6
5
10Ω
–
PULSE
GENERATOR
SEL
1.3mΩ
I
MAX=20A
100pF
14
SW1
SW2
12
CROSS
SWITCH
10kΩ
10kΩ
VDD GND
+5V
15
16
7
1k
1k
10kΩ
PROGRAMMABLE AMPLIFIER
OVERCURRENT
9
OUT
0.027µF
+5V
8
COMPARATOR
+
1k
1k
11
–
10
10kΩ
0.027µF
10kΩ
SW3
SW4
10kΩ
10kΩ
100pF
UDG-97158
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
5
PACKAGE OPTION ADDENDUM
www.ti.com
30-Mar-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
SOIC
SOIC
SOIC
SOIC
Drawing
UCC2926DS
UCC2926DSTR
UCC3926DS
OBSOLETE
OBSOLETE
OBSOLETE
OBSOLETE
DW
D
16
16
16
16
TBD
TBD
TBD
TBD
Call TI
Call TI
Call TI
Call TI
Call TI
Call TI
Call TI
Call TI
DW
D
UCC3926DSTR
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan
-
The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS
&
no Sb/Br)
-
please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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