H Bridge TANK-3A HP - without chip

This is the version without the LM18200 chip, the user must install the chip prior to use the board.

H Bridge TANK-3A HP is designed for motor control applications and for generic automation purpose.


Main features

• Can deliver up to 3A DC current
• Power supply up to 24V
• Low R_DS(ON) (0.33Ω typical)
• TTL and CMOS compatible inputs
• Thermal Warning Flag @ 145°C
• Automatic shut down @ 170°C
• Short Circuit protection
• "Shoot through" current protection

Applications

• DC and Stepper motor drivers
• PID Controllers
• Position and speed-controlled servos
• Robotics
• CNC

Tank-3A HP is designed around the high-performance hybrid H-Bridge LMD18200produced by National in order to obtain high reliability and efficiency.

Two different control modes are available: Sign Magnitude (the user must feed PWM and direction signals) or Locked Anti Phase (PWM only). LAP mode here needs only one PWM signal instead of two anti-phased signals. LAP control mode can be achieved also by microcontrollers without a PWM module: the control signal may be generated by software without the need of dedicated hardware.

This H Bridge uses the circuit board to dissipate the heat produced by the driver: this eliminates the need of an heat sink if the continuous current value doesn't exceed the value of 2.2A (r.m.s.): under this conditions the temperature of the H Bridge can reach a maximum value of 85° with an ambient temperature of 20°.
If necessary, the H Bridge can deliver up to 3A for 120 seconds without an additional heat sink.

If the H Bridge needs to be used with current values >2.2A for a long time is necessary to install the optional dedicated fan cooler: in this case the maximum current of 3A can be delivered continuously.

The optional fan is automatically turned on when the temperature reaches 55° and is shutted off when the temperature goes below 50°. If the bridge is used with currents >2.5A for a long time, the fan will be always turned on and the temperature can reach 95°.

Warning! The board can reach high temperatures when the bridge is used with high current values!

Technical features

• Continuous output current: 3A
• Peak output current: 6A (200mSec)
• Minimum motors voltage: 12V
• Maximum motors voltage: 24V
• Maximum PWM frequency: 150KHz (recommended)
• R_DS(ON) : 0.33Ω
• Operating temperature at 3A r.m.s. (T_A=20°) : 95°
• Maximum operating temperature: 145°
• Shutdown temperature: 170°

Following signals are available on the board:

• Current consumption
• Operating temperature
• Overheating flag

Connector pinout

GND (common) DIR (direction signal) PWM CS (current consumption signal) THF (temperature signal) TF (thermal flag)

The current signal is analog (0-5V or 0-3.3V) and is linear in function of current consumption (0-6A).

The temperature sensor is a LM35 and so the signal is linear in function of operating temperature in the amount of 10mV per 1°C (0V = 0°C). This signal is also used by the optional fan.

The thermal flag is an open drain output with integrated pull-up resistor. When temperature of the bridge is above 145° (maximum operating temperature) this output goes low. The internal thermal protection will automatically shut down the bridge at 170° if the user not do this when the temperature is >145°. In this case the power supply must be disconnected to reset this condition.

Further details on connections and usage examples can be found on the operating manual.

Documents:

Datasheet