GUI v1 – part 2
Continue from part 1…
About the H-Bridge and motors.
There’s a lot of H-Bridge CI’s on market today. The most used on DIY robots are:
My experiency with SN754410 is good. It’s a good device, friendy DIP package (don’t say the same about L298). But (always there’s a “but…”) it’s have a great voltage drop across the internal transistors. If you put 6V at Vmotor and a 1A load, you get Vmotor – 2V, so only 4V to the motors. For my robot I want a more efficient H-Bridge. L298 and L293D are bigger devices, have the same problem than SN754410 and… I hate L298 package. So, I move to a new device.
Fortunately, at same time I find the Toshiba’s TB6612FNG dual motor driver. It’s a really nice device, with a good package (SSOP24 300MIL). TB6612FNG specifications:
- Motor voltage (VMOT): 4.5 – 13.5 V
- Logic voltage (VCC): 2.7 – 5.5 V
- Output current maximum: 3 A per channel
- Output current continuous: 1 A per channel (can be paralleled to deliver 2 A continuous)
- Maximum PWM frequency: 100 kHz
Pololu have it in a nice breakout board, very friendly (above). After some test, they are chosen for GUI v1.