DRV8332 with Brushless Direct Drive Torquemotor

I have used the DRV8332 with BLDC gearmotors in the past and am now trying to use it to drive a low speed direct drive Torquemotor, When I drive beyond a certain speed, one of output half bridges (B channel both times) is failing and shorting power to ground. The chip has been replaced twice. The power is 28 Volts, and the motor is rated at 3 amps continuous with inductance of 1.3 milliHenrys. There are 0.1uF bypass caps on the power and boost inputs. There is no fault or OTW warning before failure and the motor current is less than 3 amps. I am using "single ended" PWM control: That is, the positive drive channel is switched at 100KHz, while the low side is held low, and the third channel is held in reset. 

One significant difference with the direct drive motor is the higher inductance. Is there any way this might be causing the failure? What else should I look for? 

Thank you, 

Robert Clark