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TI的DRV401是一款专为Vacuumschmelze（VAC）公司的磁电流传感器设计的信号控制与处理芯片。这款芯片适用于单一5V电源供电，并具备H桥驱动功能，能够驱动电感性负载。它以其卓越的直流精度、宽系统带宽、高分辨率和低温度漂移特性，被广泛应用于发电机/交流发电机监控与控制、频率和电压逆变器、电机驱动控制器以及光伏系统等领域。 DRV401的主要特点包括： 1. **兼容VAC传感器**：DRV401与VAC的多种电流范围和机械配置的传感器配合使用，能精确监测交流和直流电流。 2. **集成功能**：该芯片集成了探头激励、探头信号调理、信号环路放大器、补偿线圈的H桥驱动器以及一个提供与初级电流成比例输出电压的模拟信号输出级。 3. **过载和故障检测**：内置过载和故障检测机制，确保系统的安全性。 4. **瞬态噪声抑制**：通过内部电路降低噪声影响，提高测量精度。 5. **自动消磁功能**：在上电和按需时，对传感器进行消磁处理，以保持最高精度。 6. **外部高功率驱动器选项**：除了可以直接驱动补偿线圈，还支持连接外部功率驱动器，适应不同电流测量范围的需求。电路结构方面，DRV401包括一个积分器、滤波器、探头接口、H桥驱动器、误差检测和电源控制，以及消磁功能。其中，积分器和滤波器用于信号调理，探头接口接收来自传感器的信号，H桥驱动器驱动补偿线圈，误差检测和电源控制模块则负责实时监测系统状态，消磁功能通过特定的时序控制来实现。在实际应用中，DRV401可以用于发电机或交流发电机的监控，以控制和优化能源转换效率。在频率和电压逆变器中，它可以确保电流的准确测量，提高逆变过程的稳定性和效率。此外，电机驱动控制器利用DRV401的高精度电流检测，能更精准地控制电机的运行状态，从而提升电机性能。在光伏系统中，DRV401有助于实时监测和管理系统功率消耗，确保光伏电池阵列的高效发电。 DRV401是针对磁电流测量应用的高性能解决方案，它的集成特性、高精度和广泛的适用性使其成为众多工业和电力系统中的理想选择。需要注意的是，Texas Instruments的半导体产品有相关的可用性、标准保修和关键应用使用的声明，具体细节应在产品手册或官方文档中查阅。

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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.

         

          

 !     !   

"#$%

SBVS070B − JUNE 2006 − REVISED MAY 2009

www.ti.com

ABSOLUTE MAXIMUM RATINGS

(1)

Supply Voltage +7V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Signal Input Terminals:

Voltage

(2)

−0.5V to V

+ 0.5V. . . . . . . . . . . . . . . . . . . . . . . . . . .

Differential Amplifier

(3)

−10V to +10V. . . . . . . . . . . . . . . . . . . . . .

Current at IS1 and IS2 ±75mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current (pins other than IS1 and IS2)

(2)

±25mA. . . . . . . . . . . . . .

COMP

Short Circuit

(4)

+250mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Junction Temperature −50°C to +150°C. . . . . . . . . . . . .

Storage Temperature −55°C to +150°C. . . . . . . . . . . . . . . . . . . . . . .

ESD Rating:

Human Body Model (HBM)

Pins IA

IN1

and IA

IN2

Only 1kV. . . . . . . . . . . . . . . . . . . . . . . . . . .

All Other Pins 4kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(1)

Stresses above these ratings may cause permanent damage.

Exposure to absolute maximum conditions for extended periods

may degrade device reliability. These are stress ratings only, and

functional operation of the device at these or any other conditions

beyond those specified is not supported.

(2)

Input terminals are diode-clamped to the power-supply rails.

Input signals that can swing more than 0.5V beyond the supply

rails must be current limited, except for the differential amplifier

input pins.

(3)

These inputs are not internally protected against over voltage.

The differential amplifier input pins must be limited to 5mA, max or

±10V, max.

(4)

Power-limited; observe maximum junction temperature.

This integrated circuit can be damaged by ESD. Texas

Instruments recommends that all integrated circuits be

handled with appropriate precautions. Failure to observe

proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to

complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could

cause the device not to meet its published specifications.

ORDERING INFORMATION

(1)

PRODUCT PACKAGE-LEAD

PACKAGE

DESIGNATOR

PACKAGE

MARKING

DRV401

QFN-20

(5mm x 5mm)

RGW HAAQ

DRV401 SO-20 DWP DRV401A

(1)

For the most current package and ordering information see the

Package Option Addendum at the end of this document, or see

the TI web site at www.ti.com.

"#$%

SBVS070B − JUNE 2006 − REVISED MAY 2009

www.ti.com

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range: T

= −40°C to +125°C.

At T

= +25°C and V

DD1

= V

DD2

= +5V with external 100kHz filter BW, and zero output current I

COMP

, unless otherwise noted.

DRV401

PARAMETER CONDITIONS MIN TYP MAX

UNITS

DIFFERENTIAL AMPLIFIER R

= 10kΩ to 2.5V, V

REFIN

= 2.5V

OFFSET VOLTAGE

Offset Voltage, RTO

(1)(2)

Gain 4V/V ±0.01 ±0.1 mV

Drift, RTO

(2)

/dT ±0.1 ±1

(3)

µV/°C

vs Common-Mode, RTO CMRR −1V to +6V, V

REF

= 2.5V ±50 ±250 µV/V

vs Power-Supply, RTO PSRR V

REF

not included ±4 ±50 µV/V

SIGNAL INPUT

Common-Mode Voltage Range −1 (V

) + 1 V

SIGNAL OUTPUT

Signal Over-Range Indication (OVER-RANGE), Delay

(2)

= 1V Step, See Notes 2 and 3 2.5 to 3.5 µs

Voltage Output Swing From Negative Rail

(2)

OVER-RANGE Trip Level

I = +2.5mA, CMP Trip Level +48 +85 mV

Voltage Output Swing From Positive Rail

(2)

OVER-RANGE Trip Level

I = −2.5mA, CMP Trip Level V

− 85 V

− 48 mV

Short-Circuit Current

(2)

OUT

Connected To GND −18 mA

OUT

Connected To V

+20 mA

Gain, V

OUT

IN_DIFF

4 V/V

Gain Error ±0.02 ±0.3 %

Gain Error Drift ±0.1 ppm/°C

Linearity Error R

= 1kΩ 10 ppm

FREQUENCY RESPONSE

Bandwidth

(2)

−3dB

2 MHz

Slew Rate

(2)

SR CMVR = −1V to = +4V 6.5 V/µs

Settling Time, Large-Signal

(2)

dV ± 2V to 1%, No External Filter 0.9 µs

Settling Time

(2)

dV ± 0.4V to 0.01% 14 µs

INPUT RESISTANCE

Differential 16.5 20 23.5 kΩ

Common-Mode 41 50 59 kΩ

External Reference Input 41 50 59 kΩ

NOISE

Output Voltage Noise Density, f = 1kHz, RTO

(2)

Compensation Loop Disabled 170 nV/√Hz

COMPENSATION LOOP

DC STABILITY Probe f = 250kHz, R

LOAD

= 20Ω

Offset Error

(4)

Deviation from 50% PWM, Pin Gain = L 0.03 %

Offset Error Drift

(2)

Deviation from 50% PWM, Pin Gain = L 7.5 ppm/°C

Gain, Pin Gain = L

(2)

ICOMP1

| − |V

ICOMP2

| −200 25 200 ppm/V

Power-Supply Rejection Ratio

PSRR

Probe Loop f = 250kHz

500 ppm/V

FREQUENCY RESPONSE

Open-Loop Gain, Two Modes, 7.8kHz Pin Gain H/L

24/32 dB

PROBE COIL LOOP

Input Voltage Clamp Range Field Probe Current < 50mA −0.7 to V

+ 0.7 V

Internal Resistor, IS1 or IS2 to V

DD1

(2)

HIGH

47 59 71 Ω

Internal Resistor, IS1 or IS2 to GND1

(2)

LOW

60 75 90 Ω

Resistance Mismatch Between IS1 and IS2

(2)

ppm of R

HIGH

+ R

LOW

300 1500 ppm

Total Input Resistance

(3)

134 200 W

Comparator Threshold Current

(3)

22 28 34 mA

Minimum Probe Loop Half-Cycle

(2)

250 280 310 ns

Probe Loop Minimum Frequency 250 kHz

No Oscillation Detect (Error) Suppression 35 µs

COMPENSATION COIL DRIVER, H-BRIDGE

Peak Current

(2)

ICOMP1

− V

ICOMP2

= 4.0V

250 mA

Voltage Swing 20Ω Load 4.2 V

Output Common-Mode Voltage V

DD2

/2 V

Wire Break Detect, Threshold Current

(5)

COMP1

and I

COMP2

Railed 33 57 mA

"#$%

SBVS070B − JUNE 2006 − REVISED MAY 2009

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

Boldface limits apply over the specified temperature range, T

= −40°C to +125°C, with zero output current I

COMP

At T

= +25°C and V

DD1

= V

DD2

= +5V with external 100kHz filter BW, unless otherwise noted.

DRV401

PARAMETER CONDITIONS MIN TYP MAX

UNITS

VOLTAGE REFERENCE

Voltage

(2)

No Load 2.495 2.5 2.505 V

Drift

(2)

No Load ±5 ±50 ppm/°C

PSRR

(2)

±15 ±200 µV/V

Load Regulation

(2)

Load to GND/V

, dI = 0mA to 5mA 0.15 mV/mA

Short-Circuit Current I

REF

OUT

Connected to V

+20 mA

REF

OUT

Connected to GND −18 mA

DEMAGNETIZATION

Duration See Timing Diagram 106 130

(3)

DIGITAL I/O

LOGIC INPUTS (DEMAG, GAIN, and CCdiag Pins) CMOS Type Levels

Pull-Up High Current (CCdiag) 3.5 < V

< V

160 µA

Pull-Up Low Current (CCdiag) 0 < V

< 1.5 5 µA

Logic Input Leakage Current 0 < V

< V

0.01 5 µA

Logic Level, Input: L/H 2.1/2.8 V

Hysteresis 0.7 V

OUTPUTS (ERROR AND OVER-RANGE Pins)

Logic Level, Output: L 4mA Sink 0.3 V

Logic Level, Output: H No Internal Pull-Up

OUTPUTS (PWM and PWM Pins) Push-Pull Type

Logic Level L 4mA Sink 0.2 V

Logic Level H 4mA Source (V

) − 0.4 V

POWER SUPPLY

Specified Voltage Range V

4.5 5 5.5 V

Power-On Reset Threshold V

RST

1.8 V

Quiescent Current [I(V

DD1

) + I(V

DD2

)] I

COMP

= 0mA, Sensor Not Connected 6.8 mA

Brownout Voltage Level

(2)

4 V

Brownout Indication Delay 135 µs

TEMPERATURE RANGE

Specified Range

−40 +125 °C

Operating Range

−50 +150 °C

Package Thermal Resistance

QFN Surface-Mount

See Note 6 40 °C/W

SO PowerPAD Surface-Mount

See Note 6 27 °C/W

(1)

Parameter value referred to output (RTO).

(2)

See Typical Characteristic curves.

(3)

Total input resistance and comparator threshold current are inversely related. See Figure 2a.

(4)

For VAC sensors, 0.2% of PWM offset approximately corresponds to 10mA primary current offset per winding.

(5)

See Compensation Driver section in Applications Information.

(6)

See Applications Information section for information on power dissipation, layout considerations, and proper PCB soldering and heat-sinking technique.