UNITRODE UCC1926, UCC2926, UCC3926 Technical data

UNITRODE UCC1926, UCC2926, UCC3926 Technical data

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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 operates in both high-side (VDD referenced) and low-side (GND referenced) applications.

The UCC3926 can measure currents up to ± 20A. This transimpedance amplifier 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 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.

BLOCK DIAGRAM

UDG-97139-1

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UCC1926

UCC2926

UCC3926

ABSOLUTE MAXIMUM RATINGS

CONNECTION DIAGRAM

Input Sense Current (IIN) . . . . . . . . . . . . . . . . . . . . . . . . . ± 20A Supply Voltage, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5V Inrush Current, 50µ s . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±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 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 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

SOIC-16 (Top View)

DS Package

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for VDD = 4.8V; all temperature ranges and TA = TJ.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Supply Section

 

 

 

 

 

VDD

 

4.8

 

14

V

IVDD

 

 

3.8

6

mA

Transimpedance Amplifier Section

 

 

 

 

 

AOP – AON

IIN = 15A, VDD = 10V, 25°C

490

500

510

mV

 

IIN = 15A, VDD = 10V, 0°C to +70°C

480

500

520

mV

 

IIN = 15A, VDD = 10V, –40°C to +85°C

460

500

540

mV

 

IIN = 15A, VDD = 10V, –55°C to +125°C

410

500

590

mV

Quiescent Output Voltage (AOP, AON)

IIN = 0

 

1.0

 

V

Quiescent Differential Voltage (AOP –

IIN = 0, Measure AC Peak to Peak

 

0

30

mV

AON)

 

 

 

 

 

Bandwidth

(Note 1)

20

40

 

MHz

Output Impedance

 

 

350

500

Shunt Resistance

CSP to CSN

 

1.3

 

mΩ

PSRR

VDD = 4.8V to 10V

45

 

 

dB

 

VDD = 10V to 14V

25

 

 

dB

Temperature Coefficient

(Note 1)

–200

 

200

ppm/°C

Sign Comparator Section

 

 

 

 

 

VOH, VDD – SIGN

CSP = 1A, ISIGN = –100µ A, CSN = 0V

 

0.2

0.4

V

VOL, SIGN

CSP = –1A, ISIGN = 100µ A, CSN = 0V

 

0.2

0.4

V

IIH Threshold

Ramp CSP, CSN = 0V

 

400

700

mA

IIL Threshold

Ramp CSP, CSN = 0V

 

–400

–700

mA

Programmable Amplifier Section

 

 

 

 

 

AVOL

 

60

70

 

dB

GBW

At 200kHz

6

13

 

MHz

VIO

VIN = 0.5V, 1.5V, 2.5V

–9

 

9

mV

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UCC1926

UCC2926

UCC3926

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for VDD = 4.8V; all temperature ranges and TA = TJ.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Programmable Amplifier Section (cont.)

 

 

 

 

 

PSRR

VDD = 4.8V to 10V

60

 

 

dB

 

VDD = 10V to 14V

60

 

 

dB

Common Mode Input Range

 

0.5

 

2.5

V

IIB, Input Bias Current (NI, INV)

 

 

–100

–350

nA

IIO, Input Offset Current

 

 

20

350

nA

VOL

INV – NI = 20mV, IO = 0 A

 

100

200

mV

 

INV – NI = 20mV, IO = 200 A

 

150

300

mV

VOH

NI – INV = 20mV, IO = –200 A, (VDD – OUT)

 

1.2

2

V

VOH, Clamp

NI – INV = 20mV, VDD = 14V

6

7

8

V

IOL

OUT = 1.5V

1

3.5

 

mA

IOH

OUT = 1.5V

– 250

– 325

 

mA

Overcurrent Comparator Section

 

 

 

 

 

OC Comp Threshold

OCREF = 2V

2.00

 

2.05

V

Common Mode Range

(Note 1)

0.1

 

VDD

V

 

 

 

 

2

 

Hysteresis

 

20

40

60

mV

VOL

(OCREF – OUT) = 100mV, IOC = 100 A

 

0.2

0.4

V

VOH, VDD – OC

(OUT – OCREF) = 100mV, IOC = –100 A

 

0.2

0.4

V

Propagation Delay

(OUT – OCREF) = ± 100mV

 

90

175

ns

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

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

CROSS SWITCH

IMPEDANCE

100

AOP, AON

 

15K

 

250 A

ESD DIODE

Figure 1. AOP and AON output stage.

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