Hi Lee,
"Why are IN 2 and OUT2 different??"
When IN1 is set to a logic 0, the outputs are disabled. Current that was flowing through the FETs now flows through the body diodes of the DRV8837.
To maintain current flow OUT1 goes below ground and…
Other Parts Discussed in Thread: DRV8837EVM , DRV8837 Connected Launchpad MSP430G2 to DRV8837EVM to test PWM. Current running through IN1 and IN2 when power is applied via USB or 3V to J1. Reproduce: Connect DRV8837EVM IN1 and GND to Launchpad MSP430G2…
Other Parts Discussed in Thread: DRV8837 , DRV8837EVM Working to understand INx PWM interface on DRV8837. 3V to VM and GND. Hooked up Launchpad MSP430G2 P1.6 to DRV8837EVM IN1. Set max PWM frequency to 250 kHz. Shouldn't the motor rotate clockwise? I…
no i am not using msp fet ,i am tried to to use USB cable to debugging i have only that option.
i am using only msp430g2131 board to debugging,not G2553.
custom board am not using in this case ,
i am using DRV8837evm .
after connecting the DRV8837evm…
Hi Vladislavas,
It was confirmed that there is an issue with the spice model that is causing the spikes to appear at the output. Unfortunately, this is a problem that will not be able to be fixed at this moment.
If you want to test and evaluate the…
Tom, thank you for the layout and schematic.
What is the "current-COM1" net? The GND pin and Thermal Pad of the device should be directly connected to GND. This is important for voltage levels and thermal dissipation.
You could also order a DRV8837EVM…
ear Pablo,
thanks for your reply. from drv8837 datasheet, in brake mode , both input1 and input2 should be high. but in complementary pwm mode ,i think that if input 1 is high, then input 2 should be low, vice versa. if it is this case ,i don't think…
Hi Kato-san,
Please refer to www.ti.com/.../snva183b.pdf and www.ti.com/.../slma002h.pdf for solder coverage information.
The design files are available here: www.ti.com/.../slvc437 in the DRV8837EVM tool folder
Hi user,
To select the sense resistor, you need to determine a voltage across the sense resistor that, when amplified by a current shunt amplifier, the amplifier's output is acceptable voltage for the receiving ADC of an MCU (e.g. sense resistor sees…
Tzion,
Thanks for the correction. I edited my typos in my previous post above and made a note.
If you are using the TI EVMs for these devices, did you remove the STATUS LED from the DRV8837EVM? This will blink and sink current, which may account…
