H Bridge TANK-3A HP - without chip
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This is the version without the LM18200 chip, the user must install the chip before using the board.
H Bridge TANK-3A HP is designed for motor control applications and for generic automation purposes.
Never any 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 LMD18200 produced 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 also be achieved by microcontrollers without a PWM module: the control signal may be generated by software without the need for dedicated hardware.
This H Bridge uses the circuit board to dissipate the heat produced by the driver: this eliminates the need for a heat sink if the continuous current value doesn't exceed the value of 2.2A (rms): 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 it 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 shut off when the temperature goes below 50°. If the bridge is used with currents >2.5A for a long time, the fan will always be turned on and the temperature can reach 95°.
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 rms (T A =20°): 95°
- Maximum operating temperature: 145°
- Shutdown temperatures: 170°
Following signals are available on the board:
- Current consumption
- Operating temperature
- Overheating flag
Connector pinout
The current signal is analog (0-5V or 0-3.3V) and is linear as a function of current consumption (0-6A).
The temperature sensor is a LM35 and so the signal is linear as a 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 does 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.
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