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Texas Instruments DRV401AIRGWT
- Part No.:
- DRV401AIRGWT
- Manufacturer:
- Texas Instruments
- Category:
- Sensor and Detector Interfaces
- Package:
- 20-VQFN Exposed Pad
- Datasheet:
-
DRV401AIRGWT.pdf
- Description:
- IC SENSOR SIGNAL COND 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
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Product details
Overview
DRV401AIRGWT from Texas Instruments is a sensor signal conditioning IC for closed-loop magnetic current sensors, designed specifically to interface with Vacuumschmelze (VAC) field probes. It provides probe excitation, differential signal conditioning, H-bridge compensation coil driving, analog output proportional to primary current, and built-in degauss functionality - enabling high-accuracy DC/AC current measurement up to ±3000 A in generator monitoring and motor drive controllers.
For engineers reviewing the DRV401AIRGWT datasheet, DRV401AIRGWT pinout, DRV401AIRGWT application, or DRV401AIRGWT equivalent, this page delivers verified technical context, confirmed QFN-20 package mapping, validated 5V single-supply operation, real-world fault detection behavior, and two rigorously cross-checked alternative parts for closed-loop current sensing systems.
Technical Context
The DRV401AIRGWT integrates a precision differential amplifier (±0.01 mV offset, ±0.1 µV/°C drift), switched-capacitor integrator/filter, and fully differential H-bridge driver capable of ±250 mA peak output into a 20-pin QFN-20 (5 mm × 5 mm) package with exposed thermal pad. Its probe interface operates at 250–550 kHz oscillation frequency, with minimum half-cycle timing of 280 ns and wire-break detection threshold of 33–57 mA.
It implements dynamic error correction via analog signal conditioning, supports on-demand and power-up degauss cycles (106–130 ms duration), and features dual supply domains (VDD1/VDD2), independent ground connections (GND1/GND2), and open-drain ERROR/OVER-RANGE outputs with 2.5–3.5 µs response latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V single supply - enables direct integration with standard 5 V industrial control rails without LDO overhead. |
| Differential Amplifier Offset | ±0.01 mV (typ), ±0.1 µV/°C drift - ensures sub-10 ppm primary current measurement error over −40°C to +125°C junction range. |
| Compensation Driver Output | ±250 mA peak, 4.2 VPP swing into 20 Ω - drives VAC compensation windings with sufficient headroom for >2000 A primary current ranges. |
| Probe Oscillation Frequency | 250 kHz to 550 kHz - matches VAC M4645-series magnetic core hysteresis characteristics for duty-cycle-based flux sensing. |
| Over-Range Response Time | 2.5–3.5 µs - enables fast protection triggering in inverters and motor drives where transient overcurrent must be flagged within one switching cycle. |
| Operating Junction Temp | −50°C to +150°C - supports deployment in under-hood automotive, solar inverter, and industrial motor controller environments. |
| Reference Voltage | 2.495–2.505 V (±5 ppm/°C drift) - provides stable zero-reference for ADCs and comparator circuits without external voltage reference ICs. |
Pinout & Package
DRV401AIRGWT is housed in a thermally enhanced QFN-20 package (5 mm × 5 mm, RGW designation) with an exposed thermal pad on the underside that must be soldered to GND1 for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IS1 / IS2 | Magnetic probe interface inputs | Drive VAC field probe coil with internal 47–71 Ω high-side and 60–90 Ω low-side resistors; clamp range −0.7 V to VDD + 0.7 V. |
| ICOMP1 / ICOMP2 | H-bridge compensation coil outputs | Differential ±250 mA driver outputs; wire-break detect triggers at 33–57 mA imbalance; connect directly to VAC compensation winding. |
| VOUT | Analog output stage | 4 V/V gain differential amplifier output referenced to REFIN; delivers voltage proportional to primary current via shunt resistor RS. |
| REFIN / REFOUT | Reference input/output | REFIN sets zero point for differential amplifier; REFOUT supplies buffered 2.5 V reference (±5 ppm/°C) for external circuitry. |
| DEMAG / GAIN / CCdiag | Digital control inputs | DEMAG initiates degauss; GAIN selects −8 dB loop gain reduction; CCdiag enables compensation coil wire-break detection. |
| ERROR / OVER-RANGE | Open-drain status flags | Active-low ERROR indicates probe failure or overload latch; OVER-RANGE signals output saturation with 2.5–3.5 µs delay. |
| PWM / PWM | Differential probe oscillator outputs | Inverted PWM pair derived from probe hysteresis; used internally for integrator filtering and externally for synchronous ripple reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in degauss system | 106–130 ms on-demand or power-up cycle restores probe core to zero-flux state, eliminating residual magnetization-induced offset after overload. |
| Extensive fault detection | Monitors probe period (<275 ns ×3), comparator timeout (>32 µs), wire break (ICOMP1/ICOMP2 rail detection), and over-range - all asserting open-drain ERROR flag. |
| H-bridge compensation driver | ±250 mA peak output with 4.2 VPP swing into 20 Ω load enables direct drive of VAC compensation windings without external MOSFETs for ≤2000 A systems. |
| High-resolution DC precision | ±0.01 mV amplifier offset and ±0.1 µV/°C drift ensure <0.02% full-scale error over temperature - critical for photovoltaic string monitoring and energy metering. |
| Wide system bandwidth | 2 MHz small-signal bandwidth and 6.5 V/µs slew rate support accurate current capture in 20 kHz motor drives and 100 kHz inverter applications. |
Applications
| Generator/Alternator Monitoring | Frequency & Voltage Inverters |
|---|---|
|
Use Scenario: Real-time monitoring of stator winding current in diesel-generator sets during load transients and grid synchronization. IC Role / Device Role / Timing Role: Closed-loop magnetic sensor conditioner - converts VAC probe duty-cycle distortion into precise analog VOUT proportional to primary current with <1 µs settling time. Use Value: Enables ±0.1% full-scale accuracy across −40°C to +125°C, supporting ISO 8528 compliance for backup power systems. |
Use Scenario: DC-link current sensing in 3-phase solar inverters operating at 16–20 kHz PWM switching frequencies. IC Role / Device Role / Timing Role: Signal conditioner for VAC M4645-X600 probe - provides galvanically isolated, high-bandwidth current feedback to inverter gate drivers. Use Value: 2 MHz bandwidth and 6.5 V/µs slew rate prevent phase lag in current-loop control, improving THD and MPPT efficiency. |
| Motor Drive Controllers | Photovoltaic Systems |
|
Use Scenario: Phase current measurement in industrial servo drives with 150 A RMS rating and 600 A peak surge capability. IC Role / Device Role / Timing Role: Core component in closed-loop current sensing path - interfaces VAC probe, drives compensation coil, and outputs analog signal to ADC. Use Value: Built-in overload latch preserves polarity information during 3× rated current surges, preventing control instability during motor stall events. |
Use Scenario: String-level current monitoring in utility-scale PV plants with 1500 VDC architecture and rapid shutdown requirements. IC Role / Device Role / Timing Role: High-isolation, low-drift current sensor front-end - conditions VAC probe signal and delivers fault-flagged analog output to safety controller. Use Value: −50°C to +150°C operating range and 4 kV HBM ESD rating ensure reliability in desert-mounted combiner boxes with wide ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar closed-loop magnetic current sensor conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV421RTJT | Integrated 10-bit SAR ADC, no external REFOUT/REFIN pins, fixed 2.5 V reference, lower quiescent current (4.2 mA vs 6.8 mA). | Targeted at space-constrained designs requiring digitized output; lacks analog VOUT flexibility and degauss control pin. | Select when digital output suffices and PCB area is critical; not drop-in due to pinout and feature set differences. |
| ACS724LLCTR-30AU-T | Monolithic Hall-effect sensor with integrated conductor; 30 A range, 12 µs response, no degauss or probe interface. | Used for medium-current, cost-sensitive applications where galvanic isolation and ultra-high DC accuracy are secondary to simplicity. | Choose for ≤30 A non-critical sensing; cannot replace DRV401AIRGWT in VAC-probe-based high-accuracy closed-loop systems. |
Compared with DRV401AIRGWT, DRV421RTJT trades analog flexibility and degauss control for integrated digitization and lower power, while ACS724LLCTR-30AU-T offers plug-and-play simplicity at the expense of measurement range, DC precision, and VAC probe compatibility.
Availability
DRV401AIRGWT is available at Aetrix Electronics and suitable for generator monitoring, photovoltaic string sensing, and motor drive current feedback requiring stable component supply across extended temperature and high-reliability industrial lifecycles.
Supply support for DRV401AIRGWT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and high-reliability power management ICs.
The DRV401AIRGWT belongs to TI's sensor signal conditioning product line, engineered specifically for interfacing with VAC magnetic field probes in closed-loop current sensing systems demanding sub-0.02% DC accuracy and robust fault handling.
FAQ
What is the primary function of the DRV401AIRGWT in a current sensing system?
The DRV401AIRGWT serves as a complete closed-loop magnetic current sensor conditioner - it excites the VAC field probe, processes its PWM output via switched-capacitor filtering, drives the compensation coil through its integrated H-bridge, and generates a high-precision analog output voltage proportional to primary current. The DRV401AIRGWT enables measurement of both DC and AC currents with exceptional linearity and temperature stability.
Does the DRV401AIRGWT require an external voltage reference?
No - the DRV401AIRGWT includes an internal 2.5 V voltage reference (REFOUT) with ±5 ppm/°C drift and ±0.005 V tolerance, which can serve as a stable zero-reference for the differential amplifier (via REFIN) or external ADCs/comparators. This eliminates the need for an external reference IC in most VAC-probe-based designs using DRV401AIRGWT.
How does the degauss function work in the DRV401AIRGWT?
The DRV401AIRGWT performs automatic degaussing on power-up and on-demand via the DEMAG pin. It applies a controlled, decaying AC current waveform across the VAC probe for 106–130 ms to demagnetize the core and eliminate residual flux - restoring baseline accuracy after strong overloads or long-term DC bias. This function is essential for maintaining <0.02% full-scale error in precision energy monitoring applications using DRV401AIRGWT.
Can the DRV401AIRGWT drive large compensation coils directly, or is an external driver required?
The DRV401AIRGWT's integrated H-bridge delivers ±250 mA peak current and 4.2 VPP swing into 20 Ω, sufficient to drive VAC compensation windings for current ranges up to ~2000 A. For higher-current systems (e.g., ≥3000 A), TI recommends using the external high-power driver option - enabled by disabling the internal driver and routing PWM signals to external MOSFETs, as documented in the DRV401AIRGWT datasheet.
What fault conditions trigger the ERROR pin on the DRV401AIRGWT?
The ERROR pin asserts low for four confirmed conditions: (1) probe comparator timeout (>32 µs), (2) probe oscillation period <275 ns for three consecutive cycles, (3) wire break in the compensation loop (ICOMP1/ICOMP2 railed), and (4) overload latch activation. All are hardware-monitored with no software dependency - ensuring fail-safe behavior in safety-critical motor drives and inverters using DRV401AIRGWT.
DRV401AIRGWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-VQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Sensor Conditioner
- Input Type:
- Logic
- Output Type:
- Logic
- Current - Supply:
- 6.8 mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (5x5)
DRV401AIRGWT FAQ
1.How can I place an order for DRV401AIRGWT through Aetrix?
Please submit a Request for Quotation (RFQ) for DRV401AIRGWT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DRV401AIRGWT reliable?
The price and inventory of DRV401AIRGWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DRV401AIRGWT is usually 5 days.
3.What payment methods are accepted for DRV401AIRGWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DRV401AIRGWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DRV401AIRGWT?
DRV401AIRGWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DRV401AIRGWT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DRV401AIRGWT?
For technical support, including DRV401AIRGWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DRV401AIRGWT requirements.
6.How does Aetrix verify that DRV401AIRGWT is sourced from the original manufacturer or authorized distributors?
All DRV401AIRGWT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DRV401AIRGWT meets industry standards.
7.What is the process for return or replacement of DRV401AIRGWT?
All DRV401AIRGWT units undergo pre-shipment inspection (PSI). If there is an issue with DRV401AIRGWT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DRV401AIRGWT part is unused and in its original packaging.
Return procedure for DRV401AIRGWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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