H Bridge TANK-3A HP is designed for motor control applications and for generic automation purpose.
- Can deliver up to 3A DC current
- Power supply up to 24V
- Low RDS(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
- DC and Stepper motor drivers
- PID Controllers
- Position and speed-controlled servos
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.
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!
- Continuous output current: 3A
- Peak output current: 6A (200mSec)
- Minimum motors voltage: 12V
- Maximum motors voltage: 24V
- Maximum PWM frequency: 150KHz (recommended)
- RDS(ON) : 0.33Ω
- Operating temperature at 3A r.m.s. (TA=20°) : 95°
- Maximum operating temperature: 145°
- Shutdown temperature: 170°
- Current consumption
- Operating temperature
- Overheating 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.