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INA240 High-voltage ,  enhanced INA240 High-voltage ,  enhanced

INA240 High-voltage , enhanced - PowerPoint Presentation

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INA240 High-voltage , enhanced - PPT Presentation

PWM rejection current sense amplifier for large commonmode transients 1 Benefits of designing with current sense amplifiers Discrete current sensing Op amp used for current sensing External gain setting resistors ID: 701753

100 current 1µv gain current 100 gain 1µv error high side 10ppm sensing motor phase drift power 25µv 200

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Slide1

INA240High-voltage, enhanced PWM rejection current sense amplifier for large common-mode transients

1Slide2

Benefits of designing with current sense amplifiers

Discrete

current sensing

Op amp used for current sensing

External gain setting resistors

Input range limited by supply voltage

Dedicated

current sense amplifierSlide3

INA240 FamilyWide common-mode : -4V to 80V Bi-directionalHigh AC CMRR: 93dB @ 50kHzEnhanced PWM rejectionHigh accuracyInput offset voltage: 25µV (Max) with 0.25µV/°C Max DriftGain error: ±0.20% (Max) with 2.5ppm/°C Max DriftAvailable gains: 20, 50, 100, 200V/V

Package: TSSOP-8AEC Q100 Option available in 1Q17

Motor control • Power supplies

Solenoid/valve Control

3

Large input range to integrate into increasing common-mode voltage applications

High accuracy minimizes system marginsHigh CMRR allows for direct in-line motor current sensingFeatures

BenefitsApplicationsHigh-voltage, enhanced PWM rejection current sense amplifier for large common-mode transients

INA240EVM gain options:20V/V, 50V/V, 100V/V, 200V/V

INA240EVM User’s GuideTINA-SPICE ModelTIDA-00913 GaN half-bridge with in-line motor current sensing using INA240Tools & Resources

3

Ex: In-line Motor Current Sensing

Ex: High-side DC-DC Current Sensing

V

CM

V

CM

V

OUT

V

OUT

Stable V

OUT

!

Large, high slew rate input V

CMSlide4

Enhanced PWM RejectionWhat is it?Active circuitry which monitors the input common-mode signals.If a fast transition is detected, will suppress the signal to minimize the “glitch” to be propagated through the device’s output.How do other solutions tackle this problem?

Competitive solutions typically utilize high-bandwidth amplifiers to settle the output as quickly as possible.Problem with this approach is it may incur added delay due to the settling time.

4

V

OUT

V

CM

What system-level benefit is there with Enhanced PWM Rejection?“Blanking time” is reduced substantially!

Can measure accurately at lower duty cycles!Slide5

Why is in-line motor sensing important?Why measure current in a motor?Fault protectionInput into motor control algorithmWhy measure current in-line vs. low-side?

Low-side is a proven approach with a large customer base and perceived to have a lower system cost, but has

difficulty

to

scaling to higher precision and lower driftLow-side creates a non-linear output signal that must be post-processed to extract the proportional base current information

In-line provides a faster response, higher precision, and the ability to have less drift over a wide temperature rangeIn-line reproduces a continuous proportional signal of the phase current which does not need further processing5Slide6

6TI solutions for 3-phase DC Motor Control

Current meas. options in 3-phase DC motor

TI 3-phase DC motor current measurement solutions

In-line Phase Current

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA240

–4V to +80V

25µV

0.25µV

/°C

20, 50, 100, 200

0.2%

2.5ppm

/°C

Enhanced PWM Rejection

Low-side Phase Current

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA303

0V to +36V

35µV

0.1µV/°C

20, 50, 100

0.10%

10ppm/°C

Integrated Window Comparator

High-side Motor Current Monitoring for Over-Current Protection

Device

V

CM

Range

V

OS

VOSDriftGainGain ErrorGain Error DriftCommentINA240–4V to +80V25µV0.25µV/°C20, 50, 100, 2000.2%2.5ppm/°CUltra-high PrecisionLMP8640HV–2V to +76V900µV2.6µV/°C20, 50, 1000.25%26.2ppm/°CHigh BandwidthINA200–16V to +80V2.5mV5µV/°C (typ)20, 50, 1001%-Over-currentLow-side Motor Current Monitoring for Over-Current ProtectionDeviceVCMRangeVOSVOSDriftGainGain ErrorGain Error DriftCommentINA199–0.3V to +26V150µV0.1µV/°C50, 100, 2001.40%10ppm/°CLow-cost Current Sense AmplifierINA3010V to +36V35µV0.1µV/°C20, 50, 1000.10%10ppm/°CIntegrated Fast ComparatorSlide7

7

TI 3-phase DC Motor Current Measurement Solutions

In-line Phase Current

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA240

–4V to +80V

25µV

0.25µV

/°C

20, 50, 100, 200

0.2%

2.5ppm

/°C

Enhanced PWM Rejection

Low-side Phase Current

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA303

0V to +36V

35µV

0.1µV/°C

20, 50, 100

0.10%

10ppm/°C

Integrated Window Comparator

High-side Motor Current Monitoring for Over-Current Protection

Device

V

CM

Range

V

OS

V

OSDriftGainGain ErrorGain Error DriftCommentINA240–4V to +80V25µV0.25µV/°C20, 50, 100, 2000.2%2.5ppm/°CUltra-high PrecisionLMP8640HV–2V to +76V900µV2.6µV/°C20, 50, 1000.25%26.2ppm/°CHigh BandwidthINA200–16V to +80V2.5mV5µV/°C (typ)20, 50, 1001%-Over-currentLow-side Motor Current Monitoring for Over-Current ProtectionDeviceVCMRangeVOSVOSDriftGainGain ErrorGain Error DriftCommentINA199–0.3V to +26V150µV0.1µV/°C50, 100, 2001.40%10ppm/°CLow-cost Current Sense AmplifierINA3010V to +36V35µV0.1µV/°C20, 50, 1000.10%10ppm/°CIntegrated Fast ComparatorTI solutions for 3-phase DC motor controlCurrent Meas. options in 3-phase DC Motor

System benefits gained from using INA240

Most accurate phase current representation with in-line phase current sensing

Algorithm optimization

Reduced blanking time

Possible elimination of galvanic isolation

Increased motor efficiencySlide8

8TI solutions for embedded DC-DC power

Current measurement in Embedded DC-DC

TI Solutions for Embedded DC-DC

8

System

Power

12VDC

Current Feedback

Sense

Resistor

High-side

current sensing

(system power)

High-side

current sensing (phase power)

Single-

ph

DC-DC

FETs

Load

Vout

Low-side current sensing

High-side Current Sensing (system power)

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA240

-4V

to

+80V

25µV

0.25µV

/°C

20, 50

,

100, 200

0.2%

2.5ppm

/°C

Ultra-high Precision

INA210

-0.3V

to

+26V

35µV

60µV

100µV0.1µV/°C50, 75, 100,200, 5000.9%10ppm/°CHighPerformanceINA3010V to +36V35µV0.1µV/°C20, 50, 1000.10%10ppm/°CFast ComparatorINA3020V to +36V35µV0.1µV/°C20, 50, 1000.10%10ppm/°COver/Under CurrentHigh-side Current Sensing (phase power)DeviceVCMRangeVOSVOSDriftGainGain ErrorGain Error DriftCommentINA240-4V to +80V25µV0.25µV/°C20, 50, 100, 2000.2%2.5ppm/°CPWM RejectionINA210-0.3V to +26V35µV60µV100µV

0.1µV/°C

50

,

75, 100,

200, 500

0.9%

10ppm/°C

High

Performance

LMP8645

-2V

to

+42V

1000µV

7µV

/°C

Adjustable

2%

140ppm

/°C

High

Bandwidth

Low-side

Current Sensing

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA210

-0.3V

to

+26V

35µV

60µV

100µV

0.1µV/°C

50

,

75, 100,

200, 500

0.9%

10ppm/°C

High

Performance

INA199

–0.3V to +26V

150µV

0.1µV/°C

50, 100, 200

1.40%

10ppm/°C

Low-cost

INA301

0V to +36V

35µV

0.1µV/°C

20, 50, 100

0.10%

10ppm/°C

Fast ComparatorINA3020V to +36V35µV0.1µV/°C20, 50, 1000.10%10ppm/°CWarning/ShutdownSlide9

9

TI Solutions for Embedded DC-DC

High-side Current Sensing (system power)

Device

V

CM

Range

V

OS

V

OS

Drift

Gain

Gain Error

Gain Error Drift

Comment

INA240

-4V

to

+80V

25µV

0.25µV

/°C

20, 50

,

100, 200

0.2%

2.5ppm

/°C

Ultra-high Precision

INA210

-0.3V

to

+26V

35µV

60µV

100µV

0.1µV/°C

50

,

75, 100,

200, 500

0.9%

10ppm/°C

High

Performance

INA301

0V to +36V

35µV

0.1µV/°C

20, 50, 100

0.10%

10ppm/°C

Fast

Comparator

INA302

0V to +36V35µV0.1µV/°C20, 50, 1000.10%10ppm/°COver/Under CurrentHigh-side Current Sensing (phase power)DeviceVCMRangeVOSVOSDriftGainGain ErrorGain Error DriftCommentINA240-4V to +80V25µV0.25µV/°C20, 50, 100, 2000.2%2.5ppm/°CPWM RejectionINA210-0.3V to +26V35µV60µV100µV0.1µV/°C50, 75, 100,200, 5000.9%10ppm/°CHighPerformanceLMP8645-2V to +42V1000µV7µV/°CAdjustable2%140ppm/°CHighBandwidthLow-side Current SensingDeviceVCMRangeVOSVOSDriftGainGain ErrorGain Error DriftCommentINA210-0.3V to +26V35µV60µV100µV0.1µV/°C50, 75, 100,200, 5000.9%

10ppm/°C

High

Performance

INA199

–0.3V to +26V

150µV

0.1µV/°C

50, 100, 200

1.40%

10ppm/°C

Low-cost

INA301

0V to +36V

35µV

0.1µV/°C

20, 50, 100

0.10%

10ppm/°C

Fast

Comparator

INA302

0V to +36V

35µV

0.1µV/°C

20, 50, 100

0.10%

10ppm/°C

Warning/

Shutdown

TI

solutions

for

embedded DC-DC power

Current measurement in Embedded DC-DC

9

System

Power

12VDC

Current Feedback

Sense

Resistor

High-side

current sensing

(system power)

High-side

current sensing (phase power)

Single-

ph

DC-DC

FETs

Load

Vout

Low-side current sensing

System benefits gained from using INA240

Part of the feedback control loop for DC-DC controllers

High accuracy current measurement

Enables smaller sense resistor value which lowers overall system power dissipationSlide10

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