ISL28133ISENSEV1Z Intersil, ISL28133ISENSEV1Z Datasheet

ISL28133ISENSEV1Z

Manufacturer Part Number

ISL28133ISENSEV1Z

Description

EVALUATION BOARD FOR ISL28133

Manufacturer

Intersil

Datasheets

1.ISL28133ISENSEV1Z.pdf (20 pages)

2.ISL28133ISENSEV1Z.pdf (6 pages)

Specifications of ISL28133ISENSEV1Z

Channels Per Ic

1 - Single

Amplifier Type

Chopper (Zero-Drift)

Output Type

Rail-to-Rail

Slew Rate

0.2 V/µs

Current - Output / Channel

26mA

Operating Temperature

-40°C ~ 125°C

Current - Supply (main Ic)

18µA

Voltage - Supply, Single/dual (±)

1.65 V ~ 5.5 V

Board Type

Fully Populated

Utilized Ic / Part

ISL28133

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

-3db Bandwidth

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ISL28133ISENSEV1Z Evaluation Board User’s

Guide

The ISL28133ISENSEV1Z evaluation board contains a

complete precision current sense amplifier using the

ISL28133 chopper amplifier in a high side, low side of

floating supply current sense application.

The advantages of the ISL28133 in this application

include very low offset voltage (2µV typical) and offset

drift (0.07µV/°C), rail-to-rail input and output and low

power consumption (18µA typical). These features

provide a very high degree of precision for use in 5V,

low power applications.

Reference Documents

• ISL28133 Data Sheet (FN6560)

Evaluation Board Key Features

The ISL28133ISENSEV1Z operates from a single

1.65VDC to +5.5VDC supply. The current sense function

is configured as a single stage, balanced input,

trans-impedance amplifier. A 0.1Ω 0.1% current sense

resistor is used convert the incoming current to a voltage

which is applied to a precision differential amplifier with a

gain of 100. The overall current to voltage transfer ratio

is 10V/A, and a bidirectional current range of ±0.25A is

achieved when operating from a +5V supply, using a

2.5V reference voltage (V

achieves a total full scale offset error of 0.038% (when a

precision external reference is used) and approximately

0.15% using the internal 0.1% resistors.

The total current draw from the amplifier power is less

than 35µA and the total leakage current from the current

sense input is less than 3µA

Power Supply and Protection Features

External power connections are made through the +V,

and ground jacks. The single supply input is overvoltage

protected using a series 100Ω resistor and a 5.6V zener

diode (D1). Reverse polarity protection uses the 100Ω

resistor and two protection diode pairs (D3, D4). These

also provide input common mode voltage protection to

the op amp.

Input Protection Clamp Options

Included on the evaluation board are optional input

protection circuits that illustrate the best methods to

limit input common mode and differential transient

voltage spikes in exposed or electrically hazardous

applications. The ISL28133 can handle input common

mode and differential transients to a diode drop beyond

the rails, or to a range of -0.5V to +5.5V when

operating from a single 5V supply.

Clamp diodes D3A, B, D4A, B and input resistors R6, R7,

R8, R9 form a current limiting, 6V common mode and

differential voltage clamp. This clamp provides sufficient

April 14, 2011

AN1480.1

REF

). At +25°C, the ISL28133

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

Application Note 1480

protection for the ISL28133 for common mode fault

voltages far beyond the power supply rails. These diodes

also provide the same 6V protection against large

differential transients.

High speed current sensing may involve filtering

repetitive current transients with high peak to average

values. In these cases, limiting these transient even

further will improve amplifier response and overload

settling time. The optional Schottky diode transient

clamp D2 reduces transients let through by the common

mode clamp from 6V down to ~ ±0.3V, which improves

overload recovery time. Capacitors C7 and C9 provide

common mode noise filtering and capacitor C8 can be

used to filter the current sense signal.

Current Sense Gain Equations

The current sense amplifier in Figure 1 forms a

trans-impedance amplifier whose gain is in units of V/A

and is determined by the ratios of resistor pairs. R11:R8

and R14: R9. Resistor R11 is set equal to R14 and R8 is

set equal to R9. This matching cancels the input offset

voltage errors caused by the op amp input bias currents,

leaving behind only the offset voltage errors caused by

the ISL28133 input offset current (I

The I

Equation 1:

where:

R11 = R14 and R6 + R8 = R7 + R9

On the evaluation board, the R12, R9 resistor ratio is

100:1 (499kΩ: 4.9kΩ), and R

impedance gain given by Equation 2:

Input Range and Offset Error Analysis

The ISL28133 output swings from rail-to-rail, and the

evaluation board has a bi-directional output range of

is set to V

selectable, internal V

reference (V

scale output range is 0 ±0.25A.

The very low offset voltage (±8µV +25°C max) and

offset current (300pA +25°C max) of the ISL28133

enable the use of very high values resistors for low

current consumption while maintaining excellent

precision in battery operated circuits. The total offset

voltage contribution of the ISL28133 is the sum of the

input offset voltage (V

produced by the input offset current (IOS) through the

---------------------- -

REF

All other trademarks mentioned are the property of their respective owners.

SENSE

OUT

SENSE

±2.5V when operated from a +5V supply and V

SENSE

/2. The evaluation board contains a jumper-

to V

REF

--- -

OUT

pin). With V

SENSE

DC transfer function is given by

/2 reference or an external

) and the offset voltage

R14

---------- -

REF

SENSE

set to +2.5, the full

REF

is 0.1Ω for a trans-

(EQ. 1)

(EQ. 2)

REF

Related parts for ISL28133ISENSEV1Z

ISL28133ISENSEV1Z Summary of contents

Page 1

... Reference Documents • ISL28133 Data Sheet (FN6560) Evaluation Board Key Features The ISL28133ISENSEV1Z operates from a single 1.65VDC to +5.5VDC supply. The current sense function is configured as a single stage, balanced input, trans-impedance amplifier. A 0.1Ω 0.1% current sense resistor is used convert the incoming current to a voltage which is applied to a precision differential amplifier with a gain of 100 ...

Page 2

I-SENSE+ R6 10Ω DNP DNP 0.1 DNP DNP 10Ω C7 1nF I-SENSE- FIGURE 1. ISL28133 DIFFERENTIAL CURRENT SENSE AMPLIFIER gain resistors and using the evaluation board resistor values and the data sheet maximum ...

Page 3

Application Note 1480 CONNECT TO EXTERNAL POWER 1.65V TO +5. +2.5V REF +2.5V ±2.5V OUT V FOR SENSE OUT ±0.25A SENSE CHARGING CURRENT FIGURE 2. CURRENT SENSE FOR HIGH-SIDE BI-DIRECTIONAL RE-CHARGEABLE BATTERY ...

Page 4

... ISL28133ISENSEV1Z Components Parts List DEVICE # C2 CAP-SMD, 0805, 4.7µF, 50V, 10%, X7R, ROHS C4, C7, C9 CAP, SMD, 0603, 1000F, 25V, 10%, X7R, ROHS C8 CAP, SMD, 0603, 0.1µF, 25V, 10%, X7R, ROHS C10, C20 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS D1 Zener DiodeROHS D2- D4 DIODE-SCHOTTKY BARRIER, SMD, SOT-23, 3P, 40V, ...

Page 5

... ISL28133ISENSEV1Z Schematic Diagram I-SENSE + J4 C7 1000pF V-REF R11 J1 499k 5 Application Note 1480 R1 DNP R2 DNP R3 0.10 R4 DNP DNP C8 0.01µF D2 R10B R8 499k 4.99k R10A 499k R12B 499k D3 R12A 499k C20 OPEN R14 499k ISL28133 3 4 SOT23_5 C2 4.7µF C4 1000pF D1 J2 GND I-SENSE - ...

Page 6

... Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 6 Application Note 1480 FIGURE 4. ISL28133ISENSEV1Z TOP VIEW AN1480.1 April 14, 2011 ...

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