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Toshiba Launches Bipolar Stepping Motor Driver IC that Needs No Current Detection Resistors

2017-01-24 | Return

TOKYO–Toshiba Corporation's (TOKYO: 6502) Storage & Electronic Devices Solutions Company today announced the launch of “TB67S508FTG,” a bipolar stepping motor driver offering 40V high voltage and 3.0A current with no need for external current detection resistors. Sample shipment starts today.

Printers, office automation equipment, surveillance cameras, banking terminals such as ATMs, banknote identification machines, amusement machines, and home appliances are being downsized to save space and improve design. Low power consumption is also growing in importance as a means to scale down IC boards and reduce internal heat in products.

The new IC integrates Toshiba’s ACDS[1] architecture, adopted previously in a unipolar stepping motor driver IC. It eliminates the need for two external resistors usually required to detect motor current. By adopting a small QFN36 package (mounting area 5 mm × 5 mm), the new IC reduces the mounting area to about 66% of that of Toshiba’s current products[2]. ACDS also reduces power loss and resistor variation errors, and contributes to low power consumption and highly precise constant current control.

Main Features of the New Product

>No need for external resistors to detect current.

ACDS, Toshiba’s original architecture, realizes highly precise constant current motor control without external resistors to detect current.

>Lower heat generation during motor driving.

A built-in output DMOS with low-on-resistance (0.45Ω (upper + lower: typ.)) reduces heat generation by 13% when the stepping motor drives operate at 1A, compared to Toshiba’s current products.[3]

>Small package

A small, high-heat-radiation QFN36 package saves space and reduces costs.

Example Application Circuit

Main Specifications

Part Number	TB67S508FTG
Function	Stepping motor driver
Package	QFN36
I/F	Clock input and phase input
Step resolution modes	Full, half, quarter
Output rating (voltage)	40V
Output rating (current)	3A
Output ON resistor (upper + lower)	0.45Ω (typ.)
Power supply	Support single power drive
Abnormality detection	Thermal shutdown, over current detection, low power and under voltage detection, and OSCM terminal component open / short detection
Other functions	ACDS and ADMD^[4]

ACDS

A function that needs no external resistors for current detection and that realizes highly precise constant current motor control.

ADMD

A function to improve a follow-up ability to a high-speed rotation of motor, and realize quieter, smoother motor control.

Notes:

1: ACDS: Advanced Current Detect System.

2: Basis for comparison

Current product: Two detection resistors (5 mm × 2.5 mm) connected to the current IC (7 mm × 7 mm) with QFN48 package

New product (5 mm × 5 mm)

3: Compared with the current product, TB62213AFTG (maximum output rating 40V/3A)

4: ADMD: Advanced Dynamic Mixed Decay.

5: Basis for comparison

Current product: ±5% of the constant current error of IC + ±1% of the error of detection resistor

New product: ±5% of the constant current error of IC

Source：http://www.semicon.toshiba.co.jp/eng/