Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsDRV401AIDWPR

FEATURES

D DESIGNED FOR SENSORS FROM

VACUUMSCHMELZE (VAC)

D SINGLE SUPPLY: 5V

D POWER OUTPUT: H-Bridge

D DESIGNED FOR DRIVING INDUCTIVE LOADS

D EXCELLENT DC PRECISION

D WIDE SYSTEM BANDWIDTH

D HIGH-RESOLUTION, LOW-TEMPERATURE

DRIFT

D BUILT-IN DEGAUSS SYSTEM

D EXTENSIVE FAULT DETECTION

D EXTERNAL HIGH-POWER DRIVER OPTION

APPLICATIONS

D GENERATOR/ALTERNATOR MONITORING

AND CONTROL

D FREQUENCY AND VOLTAGE INVERTERS

D MOTOR DRIVE CONTROLLERS

D SYSTEM POWER CONSUMPTION

D PHOTOVOLTAIC SYSTEMS

DESCRIPTION

The DRV401 is designed to control and process signals

from specific magnetic current sensors made by

Vacuumschmelze GmbH & Co. KG (VAC). A variety of

current ranges and mechanical configurations are

available. Combined with a VAC sensor, the DRV401

monitors both ac and dc currents to high accuracy.

Provided functions include: probe excitation, signal

conditioning of the probe signal, signal loop amplifier, an

H-bridge driver for the compensation coil, and an analog

signal output stage that provides an output voltage

proportional to the primary current. It offers overload and

fault detection, as well as transient noise suppression.

The DRV401 can directly drive the compensation coil, or

connect to external power drivers. Therefore, the DRV401

combines with sensors to measure small to very large

currents.

To maintain the highest accuracy, the DRV401 can

demagnetize (degauss) the sensor at power-up and on

demand.

Integrator

Filter

Probe

Interface

H−Bridge

Driver

OUT

REF

COMP2

COMP1

Compensation

Patents Pending.

Diff

Amp

Timing, Error Detection,

and Power Control

Degauss V

REF

GND+5V

IS2

IS1

DRV401

Compensation Winding

Magnetic Core

Primary Winding

Field Probe

PWM PWM

DRV401

SBVS070B − JUNE 2006 − REVISED MAY 2009

Sensor Signal Conditioning IC for

Closed-Loop Magnetic Current Sensor

www.ti.com

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

PowerPAD is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.

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Summary of content (36 pages)

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DRV401 SBVS070B − JUNE 2006 − REVISED MAY 2009 Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensor FEATURES DESCRIPTION D DESIGNED FOR SENSORS FROM D D D D D D D D D VACUUMSCHMELZE (VAC) SINGLE SUPPLY: 5V POWER OUTPUT: H-Bridge DESIGNED FOR DRIVING INDUCTIVE LOADS EXCELLENT DC PRECISION WIDE SYSTEM BANDWIDTH HIGH-RESOLUTION, LOW-TEMPERATURE DRIFT BUILT-IN DEGAUSS SYSTEM EXTENSIVE FAULT DETECTION EXTERNAL HIGH-POWER DRIVER OPTION APPLICATIONS D GENERATOR/ALTERNATOR MONITORING D D D D
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Signal Input Terminals: Voltage(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5V to VDD + 0.5V Differential Amplifier(3) . . . . . . . . . . . . . . . . . . . . . . −10V to +10V Current at IS1 and IS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±75mA Current (pins other than IS1 and IS2)(2) . . . .
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range: TJ = −40°C to +125°C. At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, and zero output current ICOMP, unless otherwise noted. DRV401 PARAMETER CONDITIONS DIFFERENTIAL AMPLIFIER OFFSET VOLTAGE Offset Voltage, RTO(1)(2) Drift, RTO(2) vs Common-Mode, RTO vs Power-Supply, RTO VOS dVOS/dT CMRR PSRR MAX UNITS Gain 4V/V ±0.01 ±0.1 ±50 ±4 ±0.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 ELECTRICAL CHARACTERISTICS (continued) Boldface limits apply over the specified temperature range, TJ = −40°C to +125°C, with zero output current ICOMP. At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted. DRV401 PARAMETER VOLTAGE REFERENCE Voltage(2) Drift(2) PSRR(2) Load Regulation(2) Short-Circuit Current ISC DEMAGNETIZATION Duration CONDITIONS MIN TYP MAX UNITS No Load No Load 2.495 2.
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"#$% www.ti.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 TYPICAL CHARACTERISTICS At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted. DRV401 AND SENSOR: OUTPUT VOLTAGE NOISE DENSITY (Sensor M4645−X080, RSHUNT = 10Ω, Mode = Low) DRV401 AND SENSOR: OFFSET vs SUPPLY VOLTAGE 0.04 100 0.03 60Hz Line Frequency and Multiples (measured in a 60Hz environment) 0.02 IPRIM (A) VN (µV/√Hz) M4645−X211 M4645−X211 0.01 0 M4645−X080 −0.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 TYPICAL CHARACTERISTICS (Continued) At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 TYPICAL CHARACTERISTICS (Continued) At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted. DIFFERENTIAL AMPLIFIER: TA = +25_C LARGE−SIGNAL STEP RESPONSE 3.8 3.8 3.6 3.4 3.6 3.4 3.2 3.2 3.0 3.0 Voltage (V) Voltage (V) DIFFERENTIAL AMPLIFIER: TA = −50_C LARGE−SIGNAL STEP RESPONSE 2.8 2.6 2.4 2.8 2.6 2.4 2.2 2.2 2.0 2.0 1.8 1.6 1.8 1.6 1.4 1.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 TYPICAL CHARACTERISTICS (Continued) At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted. Gain VPWMAVERAGE /(VICOMP1, VICOMP2) (dB) DIFFERENTIAL AMPLIFIER: REFIN RESISTANCE vs TEMPERATURE 50.250 RREF IN (kΩ ) 50.125 50.000 49.875 49.750 49.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 TYPICAL CHARACTERISTICS (Continued) At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted. PROBE DRIVER: INTERNAL RESISTOR vs TEMPERATURE OUTPUT IMPEDANCE MISMATCH OF IS1 AND IS2 vs TEMPERATURE 90 Output Impedance Mismatch (Ω ) 0.10 85 80 Resistance (Ω) Driver L 75 70 65 60 Driver H 55 50 45 −50 −25 0.08 0.06 0.04 0.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 TYPICAL CHARACTERISTICS (Continued) At TA = +25°C and VDD1 = VDD2 = +5V with external 100kHz filter BW, unless otherwise noted.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 APPLICATIONS INFORMATION FUNCTIONAL PRINCIPLE OF CLOSED-LOOP CURRENT SENSORS WITH MAGNETIC PROBE USING THE DRV401 Closed-loop current sensors measure current over wide frequency ranges, including dc. These types of devices offer a contact-free method as well as excellent galvanic isolation performance combined with high resolution, accuracy, and reliability.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 FUNCTIONAL DESCRIPTION The DRV401 operates from a single +5V supply. It is a complete sensor signal conditioning circuit that directly connects to the current sensor, providing all necessary functions for the sensor operation. The DRV401 provides magnetic field probe excitation, signal conditioning, and compensation coil driver amplification. In addition, it detects error conditions and handles overload situations.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 VDD1 Probe 55Ω 55Ω IS2 IS1 CMP 18Ω PWM VREF = 0.5V NOTE: MOS components function as switches only. a) Simplified probe interface circuit. The probe is connected between S1 and S2. B B 2V/div V (IS1) 2V/div V (IS1) V (PWM)/10 500mV/div H 500mV/div H V (PWM)/10 500ns/div b) Without an external magnetic field, the hysteresis curve is symmetrical and the probe loop generates 50% duty cycle.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 The transition from normal operation to overload happens relatively slowly, because the inherent sensor transformer characteristics induce the initial primary current step, as shown in Figure 3. As the transformer-induced secondary current starts to decay, the compensation feedback driver increases its output voltage to maintain the sensor core flux compensation at zero.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 COMPENSATION DRIVER For sensors with high winding resistance (compensation coil resistance + RSHUNT) or connected to an external compensation driver, this function should be disabled by pulling the CCdiag pin low. The compensation coil driver provides the driving current for the compensation coil. A fully differential driver stage offers high signal voltages to overcome the wire resistance of the coil with only +5V supply.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 SHUNT SENSE AMPLIFIER The differential (H-bridge) driver arrangement for the compensation coil requires a differential sense amplifier for the shunt voltage. This differential amplifier offers wide bandwidth and a high slew rate for fast current sensors. Excellent dc stability and accuracy result from an auto-zero technique. The voltage gain is 4V/V, set by precisely matched and stable internal SiCr resistors.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 The reference input (REFIN) is the reference node for the exact output signal (VOUT). Connecting REFIN to the reference output (REFOUT) results in a live zero reference voltage of 2.5V. Using the same reference for REFIN and the ADC avoids mismatch errors that exist between two reference sources. OVER-RANGE COMPARATOR High peak current can overload the differential amplifier connected to the shunt.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 DEMAGNETIZATION Iron cores are not immune to residual (remanence) magnetism. The residual remanence can produce a signal offset error, especially after strong current overload, which goes along with high magnetic field density. Therefore, the DRV401 includes a signal generator for a demagnetization cycle. The digital control pin, DEMAG, starts this cycle on demand after this pin is held high for at least 25.6µs. Shorter pulses are ignored.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 VDD1 5V/div V(ERROR) 106ms 1 4 V(ICOMP2) RSH = 10Ω 2V/div 2 VOUT 3 20ms/div a) Demagnetization cycle on power-up. With power-up, the VOUT across the compensation coil centers around half the supply and then starts the cycle after the 4V threshold is exceeded. The ERROR flag resets to H after the cycle is completed.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 ERROR CONDITIONS In addition to the Over-Range flag that indicates signal clipping in the output amplifier (differential amplifier), a system error flag is provided. The ERROR flag indicates conditions when the output voltage does not represent the primary current. It is active during a demagnetization cycle, during a power-fail or brown-out. It also goes active with an open or short-circuit in the probe loop.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 BASIC CONNECTION EXAMPLE The circuit shown in Figure 8 offers an axample of a fully-connected current sensor system. IP Primary Winding Current Sensor Module Probe Core Main Core Probe Coil S1 Compensation Coil S2 K1 K2 +5V IS2 ICOMP R3 R4 C4 D1 C3 R2 D2 R1 +5V IS1 IS2 PWM GAIN PWM CCdiag ICOMP1 ICOMP2 (PWM is in phase with IS1.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 The connection example in Figure 8 illustrates the few external components required for optimal performance. Each component is described in the following list: IP is the primary current to be measured; K1 and K2 connect to the compensation coil. S1 and S2 connect to the magnetic field probe. The dots indicate the winding direction on the sensor main core. R1 and R2 form the shunt resistor RSHUNT.
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"#$% www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 POWER DISSIPATION Using the thermally-enhanced PowerPAD SO and QFN packages dramatically reduces the thermal impedance from junction to case. These packages are constructed using a down-set lead frame upon which the die is mounted, as shown in Figure 9a and Figure 9b. This arrangement results in the lead frame being exposed as a thermal pad on the underside of the package. Figure 9 shows the SO-20 package as an example.
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www.ti.com SBVS070B − JUNE 2006 − REVISED MAY 2009 Revision History DATE REV 5/09 B PAGE SECTION 1 Front Page 5 Pin Configurations DESCRIPTION Updated front page appearance. Added DWP pinout information to the Pin Assignments table. NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 24-Jan-2013 Only one of markings shown within the brackets will appear on the physical device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant DRV401AIRGWR VQFN RGW 20 3000 330.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2 DRV401AIRGWT VQFN RGW 20 250 180.0 12.4 5.3 5.3 1.5 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DRV401AIRGWR VQFN RGW 20 3000 367.0 367.0 35.0 DRV401AIRGWT VQFN RGW 20 250 210.0 185.0 35.
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