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TB67H420FTG Dual/Single Motor Driver Carrier

TB67H420FTG Dual/Single Motor Driver Carrier

MODEL: 2999

SGD $ 24.00
4
In Bulk
(per piece)

This breakout board makes it easy to use Toshiba’s TB67H420FTG brushed DC motor driver, which can operate in either dual-channel mode for independent bidirectional control of two motors or single-channel mode for driving one motor with increased current. It has a wide operating voltage range of 10 V to 47 V and can deliver a continuous 1.7 A to each motor channel, or 3.4 A in single-channel mode. A configurable current chopping threshold allows the TB67H420 to actively limit the motor current, and it features built-in protection against under-voltage, over-current, and over-temperature conditions; our carrier board also adds reverse-voltage protection (up to 40 V).

 

Overview

The TB67H420FTG from Toshiba is an H-bridge motor driver IC that can be used for bidirectional control of one or two brushed DC motors at 10 V to 47 V. It can supply up to about 1.7 A continuously to each of two separate motors or about 3.4 A to a single motor, and it can tolerate peak currents up to 4.5 A per channel (dual) or 9 A (single) for a few seconds, making it a good choice for small- to medium-sized motors that run at higher voltages. The TB67H420FTG is a great IC, but its small surface-mount package makes it difficult for the typical student or hobbyist to use; our breakout board makes it easy to use with standard solderless breadboards and 0.1″ perfboards. Since this board is a carrier for the TB67H420FTG, we recommend careful reading of the TB67H420FTG datasheet (460k pdf). The board ships populated with SMD components, including the TB67H420FTG and a reverse battery protection circuit.

Features

  • Single- or dual-channel H-bridge motor driver (can drive one or two DC motors)
  • Motor supply voltage: 10 V to 47 V
  • Output current:
    • up to 1.7 A continuous (4.5 A peak) per motor in dual-channel mode
    • up to 3.4 A continuous (9 A peak) in single-channel mode
  • Configurable current chopping actively limits motor current to 4.5 A per channel (dual) or 9 A (single) by default; can be lowered with external resistors or voltage sources
  • No separate logic supply needed; inputs are 3V- and 5V-compatible
  • Flexible input interface provides several options for control
  • Under-voltage lockout and protection against over-current/short-circuit and over-temperature
  • Open-load detection
  • Carrier board adds reverse-voltage protection up to 40 V
  • Active-low error outputs indicate over-current, over-temperature, or open-load condition
  • Compact size (1.0″ × 1.2″)
  • Exposed solderable ground pad below the driver IC on the bottom of the PCB

Note: the motor supply capacitors on this carrier are rated for 50 V; this is less margin than on most of our motor driver carriers, which have ICs with ratings of 40 V or less. Please keep this in mind if you want to push the high-voltage limit of this driver.

Included hardware

This product ships with all surface-mount components—including the TB67H420FTG driver IC—installed as shown in the product picture. However, soldering is required for assembly of the included through-hole parts: one 1×20-pin breakaway 0.1″ male header and three 2-pin, 3.5 mm terminal blocks (for board power and motor outputs).

The 0.1″ male header can be broken or cut into smaller pieces as desired and soldered into the smaller through-holes. These headers are compatible with solderless breadboards0.1″ female connectors, and our premium and pre-crimped jumper wires. The terminal blocks can be soldered into the larger holes to allow for convenient temporary connections of unterminated power and motor wires (see our short video on terminal block installation). You can also solder your motor leads and other connections directly to the board for the most compact installation.

Using the motor driver

Motor and power connections are made on one side of the board and control connections are made on the other. The driver requires an operating voltage between 10 V and 47 V to be supplied to the power input, VIN. This input is reverse-protected up to 40 V, and the VM pin provides convenient access to the reverse-protected supply voltage.

In a typical application, three connections are used to control each motor driver channel: INx1 and INx2 to set the motor direction and PWMx to set the speed, resulting in drive-brake operation. The following simplified truth table shows how the driver operates with this control method:

TB67H420FTG simplified truth table
Inputs Outputs Operation
INx1 INx2 PWMx x+ x−
1 0 PWM PWM (H/L) L forward/brake at speed PWM %
0 1 L PWM (H/L) reverse/brake at speed PWM %
1 0 0 L L brake low (outputs shorted to ground)
0 1
1 1 X
0 0 X Z Z coast (outputs floating/disconnected)
(standby if all IN and PWM inputs are low)

Note the special case when all six control inputs (INA1, INA2, PWMA, INB1, INB2, and PWMB) are low: this puts the driver into a lower-power standby mode and clears any active errors.

Alternatively, the control lines can be reduced to two pins per channel if PWM signals are applied directly to INx1 and INx2 with PWMx held high; this allows either drive/brake or drive/coast operation, depending on whether the non-PWMed input is held high or low, respectively. (Note that achieving drive/brake operation with this method requires inverted PWM signals; that is, with one IN pin PWMed and the other held high, the motor will drive while the PWM signal is low and brake while it is high.) The complete truth table below shows all possible combinations of the inputs and the driver outputs they produce:

TB67H420FTG complete truth table
Inputs Outputs Operation
PWMx INx1 INx2 x+ x−
0 0 0 Z Z coast
(standby if all IN and PWM inputs are low)
1 0 L L brake low
0 1
1 1
1 0 0 Z Z coast
1 0 H L forward
0 1 L H reverse
1 1 L L brake low

By default, the TB67H420FTG runs in dual-channel mode and drives two motors independently, but it can optionally be configured to run in a paralleled single-channel mode, in which it can deliver about twice the current to a single motor. To select single-channel mode, connect the HBMODE pin to a logic high voltage; the adjacent VCC pin provides a convenient place to do so, either with a short piece of wire or with male header pins and a 0.1″ shorting block.

In single-channel mode, the A+ and A− pins should be connected to form one motor output, and B+ and B− should be connected to form the other. The A inputs control the motor and the B inputs are not used; the driver enters standby mode when all three A control inputs are low.

TB67H420FTG Dual/Single Motor Driver Carrier driving two motors in dual-channel mode.

TB67H420FTG Dual/Single Motor Driver Carrier driving a motor in single-channel mode.

The TB67H420FTG can detect several fault (error) states that it reports by driving one or both of the LO pins low (the datasheet describes what each combination of LO1 and LO2 means). Otherwise, these pins are pulled up to VCC (5 V) by the board. Errors are latched, so the outputs will stay off and the error flag(s) will stay asserted until the error is cleared by toggling standby mode or disconnecting power to the driver.

Pinout

 

Pinout diagram of the TB67H420FTG Dual/Single Motor Driver Carrier.

 

PIN Default State Description – dual channel mode
(HBMODE = LOW)
Description – single channel mode
(HBMODE = HIGH)
VIN   10 V to 47 V board power supply input (reverse-protected up to 40 V).
GND   Ground connection points for the motor and logic supplies. The control source and the motor driver must share a common ground.
VM   These pins give access to the motor power supply after the reverse-voltage protection MOSFET (see the board schematic below). They can be used to supply reverse-protected power to other components in the system. VM is generally intended as an output, but it can also be used to supply board power, and some of the VM and GND holes are spaced for the addition of an optional through-hole capacitor.
A+   Motor A output +. Motor output A (connect together).
A−   Motor A output −.
B+   Motor B output +. Motor output B (connect together).
B−   Motor B output −.
VCC   Regulated 5 V output: this pin gives access to the voltage from the internal regulator of the TB67H420FTG. The regulator can only provide a few milliamps, so the VCC output should only be used for logic inputs on the board, not for powering external devices.
INA1 LOW Control input for A+. PWM can be applied to this pin (typically done with PWMA high). Control input for A+ and A−. PWM can be applied to this pin (typically done with PWMA high).
INA2 LOW Control input for A−. PWM can be applied to this pin (typically done with PWMA high). Control input for B+ and B−. PWM can be applied to this pin (typically done with PWMA high).
PWMA LOW PWM input for channel A. PWM input.
INB1 LOW Control input for B+. PWM can be applied to this pin (typically done with PWMB high). Not used.
INB2 LOW Control input for B−. PWM can be applied to this pin (typically done with PWMB high). Not used.
PWMB LOW PWM input for channel B. Not used.
LO1 HIGH Error output 1: drives low when an over-current or over-temperature fault occurs. Otherwise, the board pulls this pin up to VCC.
LO2 HIGH Error output 2: drives low when an open-load or over-temperature fault occurs. Otherwise, the board pulls this pin up to VCC.
VREFA   Current chopping threshold reference for channel A. Current chopping threshold reference.
VREFB   Current chopping threshold reference for channel B. Not used.
TBLKAB LOW Blanking time configuration input (see datasheet). This input should not be changed while the board is powered.
HBMODE LOW H-bridge drive mode configuration input: LOW selects dual-channel mode; HIGH selects single-channel mode. This input should not be changed while the board is powered.

Current limiting

The TB67H420FTG can actively limit the current through the motors by using a fixed-frequency PWM current regulation (current chopping). This carrier board connects voltage dividers to the VREFA and VREFB pins that set the reference voltage to about 3.6 V.

In dual channel mode, this results in a nominal current limit of 4.5 A per channel. You can lower the limit for each motor channel by adding a resistor between the corresponding VREF pin and GND, or you can apply a voltage (3.6 V max) directly to the VREF pin. The formula for the current chopping thresholds in dual-channel mode is Iout=VREF×1.25.

In single-channel mode, the default 3.6 V reference voltage results in a nominal single-channel current limit of 9 A. The formula for the current chopping threshold in single-channel mode is 

Dimensions

Size: 1.2″ × 1.0″1
Weight: 3.5 g1

General specifications

Motor driver: TB67H420FTG
Motor channels: 2
Minimum operating voltage: 10 V
Maximum operating voltage: 47 V2
Continuous output current per channel: 1.7 A
Continuous paralleled output current: 3.4 A
Reverse voltage protection?: Y2

Identifying markings

PCB dev codes: md35a
Other PCB markings: 0J11169

Notes:

  1. Without included hardware.
  2. Note: Reverse voltage protection only works up to 40 V.