Toshiba Semiconductor and Storage TB6631FNG,EL

Overview

TB6631FNG from Toshiba Electronic Devices & Storage Corporation is a 3-phase full-wave sine-wave PWM brushless DC motor controller IC designed for motor fan applications. It integrates position estimation, 6-bit triangular wave generation, dead-time control, and auto lead-angle adjustment (0°–58° in 32 steps). Operating from 7 V to 16.5 V supply, it delivers commutation signals (U/V/W high-side, X/Y/Z low-side) with 2.0 μs typical dead time and supports both 120° square-wave startup and 180° sine-wave PWM drive above 1 Hz.

For engineers reviewing the TB6631FNG datasheet, TB6631FNG pinout, TB6631FNG application, or TB6631FNG equivalent, this page provides verified technical context, validated pin functions, confirmed motor control parameters, and real-world implementation guidance for BLDC fan systems requiring precise lead-angle tuning, FG-based speed feedback, and robust overcurrent protection via IDC input.

Technical Context

The TB6631FNG implements sensor-based commutation using three Hall-effect inputs (HUP/HVP/HWP) with internal pull-ups and digital filtering (~500 ns), enabling rotor position estimation and automatic transition from 120° square-wave startup to 180° sine-wave PWM drive at ≥1 Hz. Its 6-bit triangular wave generator operates at fosc/252 (e.g., ~18–22 kHz carrier with 4.5 MHz oscillator), synchronized to Hall edge timing.

Lead angle is controlled either externally via LA pin (0–5 V = 0°–58°) or automatically using FG frequency feedback through FV/R and FV/C components. Dead-time insertion (TOFF ≈ 2.0 μs at fosc = 4.5 MHz) prevents shoot-through during sine-wave drive, while RES pin enables hardware-level motor stop and bootstrap capacitor discharge control.

Key Specifications

Pinout & Package

Package: SOP30 (30-pin small outline package), 12.8 mm × 7.6 mm × 2.45 mm, weight 0.17 g (typ.).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-phase BLDC motor controller applications.

Compared with STSPIN32F0A and MP6532, the TB6631FNG offers a balanced solution: fully autonomous Hall-based commutation with minimal MCU involvement, built-in FG feedback and Vrefout, and hardware-enforced protections - ideal for cost-sensitive, high-volume fan applications where reliability and ease of integration are critical.

Availability

TB6631FNG is available at Aetrix Electronics and suitable for CPU cooling fan control, server chassis fan modules, industrial blower motor drivers, and automotive HVAC blower applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TB6631FNG 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with expertise in motor control, power management, and analog ICs.

The TB6631FNG belongs to Toshiba's dedicated BLDC motor controller product line, engineered specifically for low-noise, high-efficiency fan and blower systems requiring robust Hall-based commutation, integrated protection, and adaptive lead-angle optimization.

FAQ

What is the function of the TEST2 pin on the TB6631FNG?

The TEST2 pin selects the modulation waveform generation interval: Low configures 360°-per-cycle timing (suitable for stable-speed operation), while High enables 60°-per-cycle timing (improving responsiveness during rapid acceleration/deceleration). This setting directly impacts how the internal counter interprets Hall edge timing for sine-wave synthesis in the TB6631FNG.

How does the TB6631FNG implement overcurrent protection?

The TB6631FNG monitors DC-link current via the IDC pin, triggering immediate commutation output shutdown when the sensed voltage exceeds 0.5 V (typ.). Protection is deactivated after one carrier cycle, allowing recovery if transient. The IDC input includes both analog (1 μs RC) and digital (1 μs) filtering to reject noise while maintaining fast fault response - a key safety feature in the TB6631FNG.

Can the TB6631FNG operate without external Hall sensors?

No - the TB6631FNG requires three Hall-effect position inputs (HUP/HVP/HWP) for rotor position estimation and commutation timing. It does not support sensorless BEMF detection. All six Hall pins (including complementary HUM/HVM/HWM) must be properly connected with appropriate pull-up networks; missing or floating Hall inputs cause HHH/LLL fault detection and force output disable.

What is the role of the UL pin in TB6631FNG lead-angle control?

The UL pin sets an upper voltage limit for the LA input, clamping the effective lead angle to prevent excessive advance that could cause instability or reduced torque. When UL = 2.0 V, for example, the maximum achievable angle is capped at ~35°, regardless of LA voltage. This hardware-based limit adds safety margin in the TB6631FNG's lead-angle tuning system.

How does the TB6631FNG handle reverse rotation detection?

The TB6631FNG asserts the REV pin high when motor rotation opposes the direction set by the CW/CCW pin - e.g., CW/CCW = Low (clockwise intent) but REV = High indicates actual counterclockwise motion. This signal originates from phase alignment logic comparing Hall sequence order against expected direction, enabling immediate fault response in the TB6631FNG.