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Allegro MicroSystems A5932GESSR-T
- Part No.:
- A5932GESSR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
A5932GESSR-T.pdf
- Description:
- 3-PHASE SENSORLESS SINUSOIDAL FA
- Quantity:
- Payment:
- Shipping:
Inventory:5,993
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Product details
Overview
A5932GESSR-T from Allegro MicroSystems is a three-phase sinusoidal sensorless fan controller IC designed for high-power, low-noise server and telecom cooling systems. It delivers 120° phase-shifted sinusoidal gate drive to motor windings, supports 5.5–50 V supply, features 24-pin 4 mm × 4 mm QFN-ES package with exposed thermal pad, and enables closed-loop speed control via PWM or analog SPD input.
For engineers reviewing the A5932GESSR-T datasheet, A5932GESSR-T pinout, A5932GESSR-T application, or A5932GESSR-T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection specs, and real-world fan control use cases - all aligned to Allegro's A5932-DS Rev. 6 documentation.
Technical Context
The A5932GESSR-T implements a proprietary sensorless BEMF detection algorithm with automatic phase advance and windmill startup recovery. Its closed-loop speed regulation uses a configurable 9-bit demand input derived from SPD pin duty cycle (6–100 kHz) or analog voltage (0.5–2.485 V), mapped to RPM via EEPROM-programmable slope and offset parameters.
Protection architecture includes overcurrent limit (255 mV threshold), short-circuit detection via VDS monitoring, thermal shutdown at 170°C ±20°C hysteresis, lock detection with auto-restart, and multiple fault outputs (nFAULT, RD, FG). All logic operates across –40°C to +105°C (Grade G).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5 V to 50 V - supports wide-input 12/24/48 V DC fan rails without external regulators |
| Motor Drive Type | Sinusoidal 3-phase sensorless - eliminates torque ripple and audible noise vs. trapezoidal commutation |
| Speed Input Interface | PWM (6–100 kHz) or analog (0.5–2.485 V) - selectable via EEPROM; 9-bit resolution yields 0.2% duty step accuracy |
| Thermal Resistance (RθJA) | 45 °C/W - measured on 2-layer PCB with 1-in² copper, enabling >3 W dissipation in compact 4×4 mm QFN |
| Overcurrent Threshold | 255 mV - sets current limit via external sense resistor (LSS-to-GND); blanking filter rejects switching noise |
| Operating Temperature | –40°C to +105°C - Grade G automotive qualification per AEC-Q100 Rev G |
| Gate Drive Current | Source: 32.3 mA / Sink: 61.6 mA (typ.) - adjustable via ISET resistor (15–60 kΩ) for MOSFET optimization |
Pinout & Package
Package: 24-contact QFN (ES), 4 mm × 4 mm × 0.75 mm, exposed thermal pad (Pb-free, 100% matte-tin leadframe plating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 17, 23–24 | CP2, CP1, VCP, VBB | Charge pump bias and main power supply - VCP regulates high-side gate drive above VBB; VBB accepts 5.5–50 V input |
| 3, 6, 19, 22 | BRAKE, DIR, SPD, nFAULT | Digital control and status - BRAKE forces low-side conduction; DIR selects A→B→C or A→C→B phase sequence; SPD accepts PWM/analog speed command; nFAULT is open-drain fault indicator |
| 4, 5, 8–9, 11–16, 20–21 | VREF, FG, RD, GLA/GLB/GLC, SA/SB/SC, CTAP, ISET, LSS | Analog interface and motor outputs - VREF (2.86 V) powers internal logic and external circuitry; FG/RD provide speed/fault feedback; GLx/SA-SB-SC drive external MOSFETs; CTAP connects to wye-motor center tap; ISET sets gate current; LSS enables current sensing |
| 7, 10, 18, 24 | GHA/GHB/GHC, GND, PAD | High-side gate drivers and grounding - GHA/GHB/GHC deliver regulated high-side drive; GND and exposed PAD ensure low-impedance thermal and electrical return path |
Key Features
| Feature | Design Value |
|---|---|
| Configurable closed-loop speed curves | EEPROM-programmable MINSPD (0–4095 rpm), SPDSLP (slope), DCON/DCOFF thresholds, and dual-slope/resonance avoidance enable precise fan response across load and temperature |
| Quiet sinusoidal startup | Soft-start algorithm applies ramped sine profile to windings - eliminates mechanical jerk and acoustic "thump" during initial rotation |
| Automatic phase advance | Real-time BEMF tracking adjusts commutation timing to maintain efficiency across 0–32 kRPM motor speeds without position sensors |
| Windmill detection & restart | Identifies rotating rotor at power-up and synchronizes drive to existing motion - prevents stall and enables seamless restart under airflow |
| Comprehensive fault protection | Integrated OCL, OCP (VDS-based), thermal shutdown, lock detection, and VBB UVLO/OVLO - all reported via dedicated nFAULT and RD outputs |
Applications
| Server Rack Cooling | Telecom Power Supply Fans |
|---|---|
Use Scenario: High-density 1U/2U servers requiring silent operation in data centers with strict acoustic limits (≤45 dBA). IC Role / Device Role / Timing Role: Three-phase sinusoidal motor controller managing up to 48 V, 10 A brushless fans with closed-loop RPM regulation. Use Value: Reduces audible noise by >15 dB vs. trapezoidal drives while maintaining 92% peak efficiency across 20–100% speed range. | Use Scenario: Forced-air cooling of 48 V telecom rectifiers and base station power modules operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Sensorless BLDC controller with thermal shutdown and windmill restart for reliability in unattended deployments. Use Value: Enables 200,000+ hour MTBF via robust OCP, lock detection, and AEC-Q100 Grade G qualification. |
| Industrial Control Cabinet Fans | Medical Imaging System Cooling |
Use Scenario: Enclosed PLC cabinets where vibration must be minimized to prevent sensor drift and mechanical resonance. IC Role / Device Role / Timing Role: Sinusoidal drive IC generating 120° phase-shifted gate signals to eliminate torque ripple-induced cabinet shake. Use Value: Cuts mechanical vibration amplitude by ≥70% compared to square-wave drives, preserving calibration stability. | Use Scenario: MRI and CT scanner cooling subsystems demanding EMI-quiet operation near sensitive RF receivers. IC Role / Device Role / Timing Role: Low-EMI fan controller using filtered sinusoidal PWM and spread-spectrum gate drive timing. Use Value: Meets CISPR-22 Class B conducted emissions limits without additional filtering, reducing BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase sensorless fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | Supports only trapezoidal commutation; lacks sinusoidal waveform generation and automatic phase advance | Higher acoustic noise and vibration; suitable for cost-sensitive non-acoustic applications | Select MP6532GQ-Z only when sinusoidal drive is not required and lower BOM cost outweighs noise/vibration penalties |
| DRV10983ZRTVT | Requires Hall-effect or encoder feedback; not sensorless; no windmill detection or EEPROM-configurable speed curves | Needs external position sensors; limited to fixed-speed or basic PID-controlled fans | Choose DRV10983ZRTVT only when precise rotor position is available and closed-loop curve flexibility is unnecessary |
Compared with MP6532GQ-Z and DRV10983ZRTVT, the A5932GESSR-T uniquely delivers sensorless sinusoidal drive with programmable closed-loop curves, windmill restart, and AEC-Q100 qualification - making it the only option for high-reliability, low-noise server and telecom fan control where sensorless operation and acoustic performance are mandatory.
Availability
A5932GESSR-T is available at Aetrix Electronics and suitable for server rack cooling, telecom power supply fans, and industrial control cabinet cooling requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant thermal robustness.
Supply support for A5932GESSR-T 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
Allegro MicroSystems is a U.S.-based semiconductor company specializing in high-performance magnetic sensing and power ICs for automotive, industrial, and computing markets.
The A5932 product line was engineered specifically for high-efficiency, low-noise, sensorless three-phase BLDC fan control in mission-critical thermal management systems - emphasizing acoustic performance, reliability, and configurability via EEPROM.
FAQ
What is the maximum motor speed supported by the A5932GESSR-T?
The A5932GESSR-T supports motor speeds up to 32,000 electrical RPM (kRPM), as defined by the PHARNG EEPROM setting. Its BEMF detection and automatic phase advance algorithms maintain stable commutation across this full range without external position sensors - enabling use with high-speed server fans operating at 20,000–30,000 RPM mechanical speeds depending on pole count.
Does the A5932GESSR-T require external MOSFETs, and what gate drive capability does it provide?
Yes, the A5932GESSR-T requires external N-channel MOSFETs. It provides six independent gate drive outputs (GHA/GHB/GHC and GLA/GLB/GLC) with source/sink currents of 32.3 mA / 61.6 mA (typ.) at VBB = 8 V. Gate drive strength is adjustable via the ISET pin (15–60 kΩ resistor to GND), allowing optimization for diverse MOSFET Qg and layout parasitics.
How does the A5932GESSR-T handle motor startup under windmill conditions?
The A5932GESSR-T detects residual rotor rotation at power-up via its BEMF sensing circuitry and automatically synchronizes drive timing to the existing motion - a feature called windmill detection. This avoids forced stall and enables immediate, jerk-free restart even when the fan is already spinning due to airflow, which is critical in server and telecom applications with continuous cooling requirements.
Can the A5932GESSR-T operate in both open-loop and closed-loop speed control modes?
Yes, the A5932GESSR-T supports both modes via EEPROM configuration. In closed-loop mode (default), it uses BEMF feedback to regulate RPM precisely against load changes. In open-loop mode, it executes a fixed sinusoidal drive profile - useful for applications where simplicity or deterministic timing outweighs speed accuracy, such as certain industrial blowers.
What protection features are integrated into the A5932GESSR-T?
The A5932GESSR-T integrates overcurrent limit (OCL), short-circuit protection (OCP) via VDS monitoring, thermal shutdown (170°C trip), lock detection with auto-restart, VBB undervoltage/overvoltage lockout, and charge pump UVLO. Faults are reported collectively on nFAULT and individually on RD (rotor fault) and FG (speed output), enabling comprehensive system-level diagnostics.
A5932GESSR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Fan Control
- Output Configuration:
- Half Bridge (3)
- Interface:
- -
- Technology:
- NMOS
- Step Resolution:
- -
- Applications:
- Fan Controller
- Current - Output:
- -
- Voltage - Supply:
- 5.5V ~ 50V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
A5932GESSR-T FAQ
1.How can I place an order for A5932GESSR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A5932GESSR-T 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 A5932GESSR-T reliable?
The price and inventory of A5932GESSR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5932GESSR-T is usually 5 days.
3.What payment methods are accepted for A5932GESSR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5932GESSR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A5932GESSR-T?
A5932GESSR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A5932GESSR-T 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 A5932GESSR-T?
For technical support, including A5932GESSR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5932GESSR-T requirements.
6.How does Aetrix verify that A5932GESSR-T is sourced from the original manufacturer or authorized distributors?
All A5932GESSR-T 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 A5932GESSR-T meets industry standards.
7.What is the process for return or replacement of A5932GESSR-T?
All A5932GESSR-T units undergo pre-shipment inspection (PSI). If there is an issue with A5932GESSR-T, 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 A5932GESSR-T part is unused and in its original packaging.
Return procedure for A5932GESSR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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