Toshiba Semiconductor and Storage TC78B006FNG,EL

Overview

TC78B006FNG,EL from Toshiba Electronic Devices & Storage Corporation is a single-phase full-wave pre-driver IC for brushless DC fan motors, featuring direct PWM input (TSP pin), rotation speed detection output (FG pin), 30 V motor supply voltage rating, built-in 5 V voltage regulator, and soft switching drive. It enables precise speed control in compact cooling systems for servers and industrial power supplies.

For engineers reviewing the TC78B006FNG,EL datasheet, TC78B006FNG,EL pinout, TC78B006FNG,EL application, or TC78B006FNG,EL equivalent, this page delivers verified functional identity, SSOP-16 package mapping, confirmed Hall-based commutation logic, thermal shutdown at 165°C, and real-world motor control timing behavior - all directly extracted from Toshiba's official TC78B006 series documentation.

Technical Context

The TC78B006FNG,EL implements Hall-effect sensor interface logic with ±10 mV hysteresis and 40 mV minimum input swing to detect rotor position, enabling square-wave startup and estimated-timing commutation above 10 Hz. Its internal oscillator runs at 10 MHz (typ.), generating a 40 kHz (typ.) output PWM frequency with configurable soft start and soft switching via external RC networks on SS and VSOFT pins.

It integrates lock protection with auto-restart, current limit detection (150 mV threshold on OC pin), and thermal shutdown (165°C trip, 40°C hysteresis). The device supports two control modes: direct PWM input (TSP) with FG feedback, and analog voltage input (VSP) variants - but TC78B006FNG,EL exclusively uses TSP/FG configuration per its pin assignment and package marking.

Key Specifications

Pinout & Package

TC78B006FNG,EL is housed in a 16-pin SSOP package (SSOP16-P-225-0.65B), 5.0 mm × 6.4 mm, 0.65 mm pitch, with exposed pad not electrically connected. Pin 1 is top-left corner (marking dot adjacent), and pin numbering follows standard SSOP counter-clockwise sequence.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fan motor pre-driver applications.

Compared with TC78B006AFNG,EL and TC78B006BFNG,EL, the TC78B006FNG,EL uniquely provides both direct PWM control and real-time FG-based speed telemetry in SSOP-16 - making it the only variant suitable for microcontroller-based closed-loop fan speed regulation without external tach conditioning.

Availability

TC78B006FNG,EL is available at Aetrix Electronics and suitable for server thermal management, industrial power supply cooling, and medical diagnostic equipment requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for TC78B006FNG,EL 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 high-reliability semiconductor solutions for automotive, industrial, and computing applications, with emphasis on motor control, power management, and optical devices.

The TC78B006 series targets cost-sensitive, space-constrained BLDC fan applications requiring integrated Hall commutation, lock protection, and programmable soft switching - specifically optimized for 12 V/24 V cooling systems in datacenter and power infrastructure.

FAQ

What is the primary function of the TC78B006FNG,EL in a fan motor system?

The TC78B006FNG,EL serves as a single-phase full-wave pre-driver IC that controls external high- and low-side MOSFETs in a BLDC fan motor. It interprets PWM input on the TSP pin to regulate output duty, uses Hall inputs (HP/HM) for rotor position sensing, and provides rotation speed feedback via the FG pin. The TC78B006FNG,EL integrates essential functions including soft start, soft switching, lock protection with auto-restart, and thermal shutdown - eliminating the need for discrete timing components or external protection circuitry.

How does the TC78B006FNG,EL handle motor stall conditions?

The TC78B006FNG,EL detects motor stall by monitoring Hall sensor zero-cross events: if no transition occurs for a time defined by the CT pin RC network (TON), it activates lock protection - turning off the high-side FETs first, then all outputs. After a configurable auto-restart delay (TOFF), it attempts recovery. During lock protection, the FG pin continues outputting based on last valid Hall edge. The TC78B006FNG,EL does not require external watchdog circuitry, as this behavior is fully embedded and self-managed.

Can the TC78B006FNG,EL operate with a 5 V motor supply voltage?

Yes, the TC78B006FNG,EL supports VM = 5.5 V minimum for normal operation, and 3.5 V minimum for low-voltage operation (though electrical characteristics are not guaranteed below 5.5 V). Its UVLO threshold is 2.9 V (typ.), allowing safe startup from weak or partially discharged rails. However, the TC78B006FNG,EL's VREG output remains stable at 5 V across this range, enabling reliable Hall sensor biasing even at reduced VM - a key advantage over non-regulated pre-drivers.

What is the role of the VMI pin on the TC78B006FNG,EL?

The VMI pin on the TC78B006FNG,EL configures either minimum output duty or startup threshold duty using a 32-step lookup table (0–4.12 V). When used for minimum duty, it prevents output from dropping below a set level (e.g., 5%–50%), ensuring fan spin-up under load. When used for startup threshold, it defines the TSP duty level required to initiate motor rotation. Importantly, configuring VMI disables standby mode - a deliberate trade-off to guarantee immediate response during low-duty operation. The TC78B006FNG,EL requires VMI to be tied to GND if unused.

Is the TC78B006FNG,EL pin-compatible with other variants in the TC78B006 series?

No - while TC78B006FNG,EL shares the SSOP-16 package and pinout with TC78B006AFNG,EL, TC78B006BFNG,EL, and TC78B006CFNG,EL, the FG and RDO functions are mutually exclusive per variant. TC78B006FNG,EL has FG on pin 5 and TSP on pin 6; TC78B006AFNG,EL swaps FG for RDO on pin 5. Substituting without board revision risks loss of speed feedback or false lock alarms. The TC78B006FNG,EL is not a drop-in replacement for any other TC78B006 variant - functional compatibility requires matching control interface (PWM vs. analog) and feedback requirement (FG vs. RDO).