TB6551FG(O,EL,DRY) Integrated Circuits (ICs)

Step Resolution:	--
Base Part Number:	TB6551
Supplier Device Package:	24-SSOP
Package / Case:	24-SOP (0.236", 6.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-30°C ~ 115°C (TA)
Voltage - Load:	--
Voltage - Supply:	6 V ~ 10 V
Current - Output:	--
Applications:	Fan Controller
Series:	--
Technology:	Bi-CMOS
Interface:	Parallel
Output Configuration:	Pre-Driver - Half Bridge (3)
Function:	Controller - Commutation, Direction Management
Motor Type - AC, DC:	Brushless DC (BLDC)
Motor Type - Stepper:	--
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction
Power management integrated circuits (PMICs) are used to control, monitor and distribute power in electronic circuits. PMICs can be divided into several categories, such as DC-DC controllers, motor drivers, controllers and battery management ICs. The TB6551FG(O,EL,DRY) is a member within this PMIC family and it has been developed by Toshiba. This article fives an overview of the application field and working principle of the TB6551FG(O,EL,DRY).

Overview
The TB6551FG(O,EL,DRY) is a motor driver and controller IC. It consists of a pre-driver IC and MOSFET, which provide gate signals for controlling motor operations. The TB6551FG(O,EL,DRY) allows for external control of motor speed, torque and direction. The motor driver is optimized for controlling small motors, such as LED lighting systems, CD/DVD players and small size DC motors. It also has a built-in degenerative brake circuit which can provide more stable and effective braking control. The circuit supports PWM control and helps to save energy.

Features
The TB6551FG(O,EL,DRY) has the following features:

• Supports a wide range of operating voltage from 1.2 V to 8.5 V.
• Built-in driver current control which can regulate motor current up to 2A.
• Selectable standby current for low power consumption.
• Low power consumption (3 mW).
• Protection features such as overcurrent and overtemperature protection.
• Built-in degenerative brake circuit which provides more stable and effective braking control.

Application Fields
The TB6551FG(O,EL,DRY) is suited for use in the following applications:

• DC Motors used in medical and office equipment.
• CD/DVD players and drives.
• Vibration motors for haptic feedback.
• LED lighting systems.
• Robotics.
• Small size motor control.

Block Diagram
The block diagram of the TB6551FG(O,EL,DRY) looks as follows:

The TB6551FG(O,EL,DRY) contains an IGBT pre-driver consisting of a PNP/NPN pre-driver transistor, a driver MOSFET, a switching MOSFET, and a braking MOSFET. It also features comparators, a low voltage reset circuit, overcurrent protection, barometric aging and over-temperature protection circuits.

Working Principle
The TB6551FG(O,EL,DRY) provides gate signals for controlling motor operations. Input signals are provided by an external MCU. Two channels are available for controlling motor speed and direction. The motor driver and controller also support PWM control and a built-in degenerative brake circuit for more efficient braking control.The PNP/NPN pre-driver transistors are used to generate the gate signals for the switch and brake MOSFETs. The PNP pre-driver can be used for braking and the NPN pre-driver for switching. The pre-driver can also be used to provide gate signalling for controlling the motor speed and direction. The pre-driver can also be used to provide gate signalling for controlling the motor speed and direction. The over-current protection circuit monitors and detects overcurrent conditions. If an overcurrent condition is detected, the gate drive signal is immediately disabled and the current is limited. The barometric aging and over-temperature protection circuit monitors the temperature and over-temperature conditions in order to protect the circuit and the motor.

Conclusion
The TB6551FG(O,EL,DRY) is a motor driver and controller IC developed by Toshiba Optimized for small motors, it is designed to provide external control of motor speed and direction. It also has a built-in degenerative brake circuit which helps to save energy and improve motor performance. The TB6551FG(O,EL,DRY) is suitable for many applications, including DC motors, CD/DVD players and LED lighting systems.

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