UNITRODE UCC1926, UCC2926, UCC3926 Technical data

±20A Integrated Current Sensor

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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 oper­ates in both high-side (V
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 chop­per-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 am­plifier 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.

referenced) and low-side (GND referenced) ap-

DD

BLOCK DIAGRAM

UDG-97139-1

SLUS266A - OCTOBER 1999

ABSOLUTE MAXIMUM RATINGS

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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

(referenced to GND) . . . . . . . . . . . . . . . . . . . . . . . . . ± 200mV

CSP, CSN, Common Mode Range

(referenced to V

DD) . . . . . . . . . . . . . . . . . . . . . . . . . . ± 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 termi­nal. Consult Packaging Section of Databook for thermal limita­tions and considerations of packages.

ORDERING INFORMATION

TEMPERATURE RANGE PACKAGES

UCC1926 – 55°C to +125°C DS
UCC2926 – 40°C to +85°C DS
UCC3926 0°C to +70°C DS

UCC1926
UCC2926
UCC3926

CONNECTION DIAGRAM

SOIC-16 (Top View)
DS Package

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for VDD = 4.8V; all temperature

ranges and T

Supply Section

VDD 4.8 14 V
I

VDD

Transimpedance Amplifier Section

AOP – AON I

Quiescent Output Voltage (AOP, AON) I
Quiescent Differential Voltage (AOP –

AON)
Bandwidth (Note 1) 20 40 MHz
Output Impedance 350 500 Ω
Shunt Resistance CSP to CSN 1.3 mΩ
PSRR VDD = 4.8V to 10V 45 dB

Temperature Coefficient (Note 1) –200 200

Sign Comparator Section

V

OH

V

OL

Threshold Ramp CSP, CSN = 0V 400 700 mA

I

IH

Threshold Ramp CSP, CSN = 0V –400 –700 mA

I

IL

Programmable Amplifier Section

A

VOL

GBW At 200kHz 6 13 MHz
V

IO

A =TJ.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

= 15A, VDD = 10V, 25°C 490 500 510 mV

IN

= 15A, VDD = 10V, 0°C to +70°C 480 500 520 mV

I

IN

= 15A, VDD = 10V, –40°C to +85°C 460 500 540 mV

I

IN

= 15A, VDD = 10V, –55°C to +125°C 410 500 590 mV

I

IN

= 0 1.0 V

IN

= 0, Measure AC Peak to Peak 0 30 mV

I

IN

VDD = 10V to 14V 25 dB

, VDD – SIGN CSP = 1A, I

, SIGN CSP = –1A, I

VIN= 0.5V, 1.5V, 2.5V –9 9 mV

3.8 6 mA

= –100µA, CSN = 0V 0.2 0.4 V

SIGN

= 100µA, CSN = 0V 0.2 0.4 V

SIGN

60 70 dB

ppm/°C

2

UCC1926

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UCC2926
UCC3926

ELECTRICAL CHARACTERISTICS:

ranges and T

Programmable Amplifier Section (cont.)

PSRR V

Common Mode Input Range 0.5 2.5 V

, Input Bias Current (NI, INV) –100 –350 nA

I

IB

, Input Offset Current 20 350 nA

I

IO

V

OL

V

OH

V

OH

I

OL

I

OH

Overcurrent Comparator Section

OC Comp Threshold OCREF = 2V 2.00 2.05 V
Common Mode Range (Note 1) 0.1 V

Hysteresis 20 40 60 mV
VOL (OCREF – OUT) = 100mV, IOC = 100µA 0.2 0.4 V
VOH, VDD – OC (OUT – OCREF) = 100mV, IOC = –100µA 0.2 0.4 V
Propagation Delay (OUT – OCREF) = ±100mV 90 175 ns

Note 1: Guaranteed by design.Not 100% tested in prodcution.

A =TJ.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

, Clamp NI – INV = 20mV, VDD = 14V 6 7 8 V

Unless otherwise stated, these specifications apply for VDD = 4.8V; all temperature

= 4.8V to 10V 60 dB

DD

= 10V to 14V 60 dB

V

DD

INV – NI = 20mV, IO = 0µA 100 200 mV
INV – NI = 20mV, IO = 200µA 150 300 mV
NI – INV = 20mV, IO = –200µA, (VDD – OUT) 1.2 2 V

OUT = 1.5V 1 3.5 mA
OUT = 1.5V – 250 – 325 mA

DD–

2

V

PIN DESCRIPTIONS

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.

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.

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

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.

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.

VDD

15K

CROSS SWITCH

IMPEDANCE

100

250µA

AOP, AON

ESD DIODE

Figure 1. AOP and AON output stage.

3

PIN DESCRIPTIONS (cont.)

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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.

OCREF: The reference pin of overcurrent comparator for
setting overcurrent threshold voltage.

OUT: Output of the programmable amplifier intended to
provide differential to single-ended signal conversion of
the transimpedance amplifier's outputs.

TYPICAL CHARACTERISTICS CURVES

UCC1926
UCC2926
UCC3926

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 appli­cation’s performance.

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.

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.

700

600

500

400

300

OUTPUT [mV]

200

100

0

-20 -15 -10 -5 0 5 10 15 20
INPUT CURRENT [A]

LIMITOFRESOLUTION

(SIGN LIMIT

THRESHOLD BAND)

Figure 2. Differential output voltage (AOP-AON) vs.
input current (I

620

600

VDD = 14V

580

560

540

VDD = 12V

520

OUTPUT VOLTAGE [mV]

VDD = 10V

500

VDD = 4.8V

480

-75 -50 -25 0 25 50 75 100 125

IN

).

IIN= 15A

TEMPERATURE [°C]

1.4

1.3

1.2

1.1
1

0.9

0.8

0.7

QUIESCENT OUTPUT VOLTAGE [V]

0.6

-75 -50 -25 0 25 50 75 100 125
TEMPERATURE [°C]

Figure 3. Quiescent AOP,AON output voltage vs.
temperature.

1.800

1.700

1.600

1.500

]

Ω

1.400

[m

1.300

SHUNT

1.200

R

1.100

1.000

0.900

0.800

-75 -50 -25 0 25 50 75 100 125
TEMPERATURE [°C]

Figure 4. Differential output voltage (AOP - AON) vs.

Figure 5. Typical shunt resistance vs. temperature.

VDD and temperature.

4

LAB EVALUATION CIRCUIT

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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 ampli­fier output and set the overcurrent comparator threshold.

-

VDD GND

PULSE

GENERATOR

+5V

1k

1k

SW1

SW2

0.027µF

10Ω

+10V

10kΩ

+5V

1k

1k

0.027µF10µF

10kΩ

10kΩ

V

S

1k

0.027µF

13

14

15

16

10

10kΩ

4

1

2

3

7

8

TRANSIMPENDANCE
AMPLIFIER rm=3.33mΩ

1.3mΩ

I

=20A

MAX

PROGRAMMABLE AMPLIFIER

10kΩ

10kΩ

SIGN COMPARATOR

+
–

OVERCURRENT

COMPARATOR

+
–

CROSS

SWITCH

SEL

12

11

6

5

100pF

9

OUT

10kΩ

10kΩ

100pF

UNITRODE CORPORATION
7 CONTINENTAL BLVD.• MERRIMACK, NH 03054
TEL. [phone] • FAX [phone]

5

SW3

SW4

UDG-97158

IMPORTANT NOTICE

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