DRV8301, working well at first, then go to fault: GVDD_UV

Hello, I see you responded to my post regarding a similar issue.  How heavily are you loaded the motor drive system? Under no load conditions the controller I made worked; however, transient voltages from back emf (under heavy load) caused the chip to fail.  I recommend using Transient Voltage Suppression (TVS) diodes to protect the DRV chip as well as increasing the size of the capacitors on the PVDD line.  I have also talked to similar universities who have increased the size of the charge pump capacitor and that also seemed to help the issue.

pin54 and 53, the capacitor for VCC60_1 is 2.2uf/100V (1206 package) and 0.1uf/100V (Monolithic capacitor).
C56 is 22nF, packege is 0805. I do not know it's voltage rating.
I have changed C69 to 10uF/63 capacitor, but the problem is still exist.

I have changed it with a new one. But the problems still exist.

" GVDD should be approximately 11V".  Is this status exist on the default situation without DSP config? 

The following is my pcb. The left is without GND polygon, the right is the final one.

Hi user1416086,

Thank you for the layout. It appears your troubles may be associated with the layout.This layout shows long ground loops for the regulator capacitors and a single metal trace connecting the ground pad of the device. Is that correct?

It is suggested to follow the layout guidelines described in section 10 of the datasheet. You can also refer to the BOOSTXL-DRV8301 layout as a reference.

" GVDD should be approximately 11V".  Is this status exist on the default situation without DSP config? 

No, GVDD should be approximately 11V when the device is powered and EN_GATE = 1

Thanks for your reply.

It may be the PCB layout which lead this problems. I have lead a thick wire from the bottom of the powerpad holes  to the GND, but it can not solve this problems.

My be , I have to make a new pcb layout instead.

Hi Rick Duncan,
Can I design my pcb accordiing to BOOSTXL-DRV8301 board in addtion to its voltage?
My board will work on 48V voltage.

Any other questions I have to pay attention? 

Hi user1416086,

Yes you can design your pcb according to the BOOSTXL-DRV8301. The components (FETs and capacitors) should be changed for 48V operation.
Depending on the current, the capacitors may need to be increased. The PCB traces and connectors may also require changing if the current is higher.

Hi Rick.

I have made a new PCB board following to the BOOSTXL-DRV8301. 

But, it still can not dirvier the motor, The fault code is : GVDD_UV.

The pin of GVDD is 11V when the EN_GATE is enabled, and then it follow to about 3.7V,

It changed from 11V -3.7V for several times. 

I have try to add  a electric capacitor of 10uf or 330uf beside to the pin of PVDD1 and PVDD2 , but it can not change anything.

the following is my pcb layout:

Hi,Rick 

I have try to reassemble the capatiors of GVDD and bootstrap.

The GVDD voltage can be on the 11V very stable.

But, the Fault led is still on when EN_GAGE is enabled.

The status register1 code is 0x0600, GVDD_UV fault.

The status register2 code is 0x0801

Hi Rick,

I made a quick reset on EN_GATE.

Now the motor can run in mode1( open loop), but the fault led is blinking,  the motor's runing is not smooth, the fault code is still 0x0600(GVDD_UV)

It can be say that the DRV8301 in the loop:  run->fault->quick reset->run.

Hi user1416086,

Can you provide a scope capture of GVDD, BST_A, BST_B, and BST_C prior to the nFAULT pin going low? You should zoom in to 10us/div.

This should provide the next clue.

Hi Rick,

My oscillator only has one channel can be used.  So the following is my description and pictures：

The power voltage is 24V

               EN_GATE=0      EN_GATE=1
GVDD     0V                      11V
BST_A    0V                      pwm-pulse, pulse-last, 10.6V
BST_B    0V                      pwm-pulse, pulse-last, 10.6V
BST_C    0V                      pwm-pulse, pulse-last, 10.6V

picture:  pwm-pulse,  pwm-pulse amplify to 10us/div,  pulse-last

Hi Rick,

My PWM mode number is 6.

My programmer is modified on the TI BLDC_SD project. The following is  some functions about BLDC PWM.

======================================================================

f28035/dmclib/drvlib/f2803xbldcpwm.h

======================================================================

#define BLDCPWM_MACRO(v) /* */\
/* Convert "Period" (Q15) modulation function to Q0 */\
Tmp = (int32)v.PeriodMax*(int32)v.MfuncPeriod; /* Q15 = Q0xQ15 */\
Period = (int16)(Tmp>>15); /* Q15 -> Q0 (Period) */\
/* */\
/* Check PwmActive setting */\
if (v.PwmActive==1) /* PWM active high */\
GPR0_BLDC_PWM = 0x7FFF - v.DutyFunc; /* */\
/* */\
else if (v.PwmActive==0) /* PWM active low */\
GPR0_BLDC_PWM = v.DutyFunc; /* */\
/* */\
/* Convert "DutyFunc" or "GPR0_BLDC_PWM" (Q15) duty modulation function to Q0 */\
Tmp = (int32)Period*(int32)GPR0_BLDC_PWM; /* Q15 = Q0xQ15 */\
/* */\
/* State s1: current flows to motor windings from phase A->B, de-energized phase = C */\
if (v.CmtnPointer==0) /* */\
{ /* */\
EPwm1Regs.AQCSFRC.bit.CSFA = 0; /* Forcing disabledd on output A of EPWM1 */\
EPwm1Regs.AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
EPwm1Regs.AQCTLA.bit.ZRO = 1; /* Set low when CTR = Zero */\
EPwm1Regs.CMPA.half.CMPA = (int16)(Tmp>>15); /* PWM signal on output A of EPWM1 (Q15 -> Q0) */\
EPwm1Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM1 */\
/* */\
EPwm2Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM2 */\
EPwm2Regs.AQCSFRC.bit.CSFB = 2; /* Forcing a continuous High on output B of EPWM2 */\
/* */\
EPwm3Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM3 */\
EPwm3Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM3 */\
} /* */\
/* */\
/* State s2: current flows to motor windings from phase A->C, de-energized phase = B */\
else if (v.CmtnPointer==1) /* */\
{ /* */\
EPwm1Regs.AQCSFRC.bit.CSFA = 0; /* Forcing disabledd on output A of EPWM1 */\
EPwm1Regs.AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
EPwm1Regs.AQCTLA.bit.ZRO = 1; /* Set low when CTR = Zero */\
EPwm1Regs.CMPA.half.CMPA = (int16)(Tmp>>15); /* PWM signal on output A of EPWM1 (Q15 -> Q0) */\
EPwm1Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM1 */\
/* */\
EPwm2Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM2 */\
EPwm2Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM2 */\
/* */\
EPwm3Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM3 */\
EPwm3Regs.AQCSFRC.bit.CSFB = 2; /* Forcing a continuous High on output B of EPWM3 */\
} /* */\
/* */\
/* State s3: current flows to motor windings from phase B->C, de-energized phase = A */\
else if (v.CmtnPointer==2) /* */\
{ /* */\
EPwm1Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM1 */\
EPwm1Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM1 */\
/* */\
EPwm2Regs.AQCSFRC.bit.CSFA = 0; /* Forcing disabled on output A of EPWM2 */\
EPwm2Regs.AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
EPwm2Regs.AQCTLA.bit.ZRO = 1; /* Set low when CTR = Zero */\
EPwm2Regs.CMPA.half.CMPA = (int16)(Tmp>>15); /* PWM signal on output A of EPWM2 (Q15 -> Q0) */\
EPwm2Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM2 */\
/* */\
EPwm3Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM3 */\
EPwm3Regs.AQCSFRC.bit.CSFB = 2; /* Forcing a continuous High on output B of EPWM3 */\
} /* */\
/* */\
/* State s4: current flows to motor windings from phase B->A, de-energized phase = C */\
else if (v.CmtnPointer==3) /* */\
{ /* */\
EPwm1Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM1 */\
EPwm1Regs.AQCSFRC.bit.CSFB = 2; /* Forcing a continuous High on output B of EPWM1 */\
/* */\
EPwm2Regs.AQCSFRC.bit.CSFA = 0; /* Forcing disabled on output A of EPWM2 */\
EPwm2Regs.AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
EPwm2Regs.AQCTLA.bit.ZRO = 1; /* Set low when CTR = Zero */\
EPwm2Regs.CMPA.half.CMPA = (int16)(Tmp>>15); /* PWM signal on output A of EPWM2 (Q15 -> Q0) */\
EPwm2Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM2 */\
/* */\
EPwm3Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM3 */\
EPwm3Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM3 */\
} /* */\
/* */\
/* State s5: current flows to motor windings from phase C->A, de-energized phase = B */\
else if (v.CmtnPointer==4) /* */\
{ /* */\
EPwm1Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM1 */\
EPwm1Regs.AQCSFRC.bit.CSFB = 2; /* Forcing a continuous High on output B of EPWM1 */\
/* */\
EPwm2Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM2 */\
EPwm2Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM2 */\
/* */\
EPwm3Regs.AQCSFRC.bit.CSFA = 0; /* Forcing disabled on output A of EPWM3 */\
EPwm3Regs.AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
EPwm3Regs.AQCTLA.bit.ZRO = 1; /* Set low when CTR = Zero */\
EPwm3Regs.CMPA.half.CMPA = (int16)(Tmp>>15); /* PWM signal on output A of EPWM3 (Q15 -> Q0) */\
EPwm3Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM3 */\
} /* */\
/* */\
/* State s6: current flows to motor windings from phase C->B, de-energized phase = A */\
else if (v.CmtnPointer==5) /* */\
{ /* */\
EPwm1Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM1 */\
EPwm1Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM1 */\
/* */\
EPwm2Regs.AQCSFRC.bit.CSFA = 1; /* Forcing a continuous Low on output A of EPWM2 */\
EPwm2Regs.AQCSFRC.bit.CSFB = 2; /* Forcing a continuous High on output B of EPWM2 */\
/* */\
EPwm3Regs.AQCSFRC.bit.CSFA = 0; /* Forcing disabled on output A of EPWM3 */\
EPwm3Regs.AQCTLA.bit.CAU = 2; /* Set high when CTR = CMPA on UP-count */\
EPwm3Regs.AQCTLA.bit.ZRO = 1; /* Set low when CTR = Zero */\
EPwm3Regs.CMPA.half.CMPA = (int16)(Tmp>>15); /* PWM signal on output A of EPWM3 (Q15 -> Q0) */\
EPwm3Regs.AQCSFRC.bit.CSFB = 1; /* Forcing a continuous Low on output B of EPWM3 */\
}

#endif // __F280X_BLDCPWM_H__

Hi,Rick

The following  is the  wave  picture of motor booting  captured by the com  port of PC.

The motor can only run one step, and then stop.

Ib and Ic is used, Ia is not used.

Hi Rick,

I have test my programme(open loop) on the BOOSTXL-DRV8301 board, it can drive the motor normally.

It must be a hardware  problem.

How can I test the chip of DRV8301? Maybe it has been damaged.