Abstract: A controller for use in a power converter of a motor drive includes a control circuit configured to turn ON a high side switch by sinking a current of an ON signal. A high side signal interface circuit is coupled to receive the ON signal to generate a drive signal to control switching of the high side switch in a presence of a common mode signal caused by slewing at a half bridge node. The high side signal interface circuit includes a common mode cancellation circuit coupled to provide a common rejection signal to provide a cancellation or rejection of the common mode signal. A first current hysteresis comparator is coupled to receive a common mode rejection signal, a first current signal, and a fourth current signal, and generate a first output signal in a presence of a common mode voltage.

Abstract: A power converter controller includes a high side signal interface circuit that includes a common mode cancellation circuit that is coupled to generate a fourth current signal representative of an OFF signal referenced to a bypass voltage during an initial state, and a first current signal in response to an ON signal being pulled to a lower value relative to the OFF signal to turn ON a high side switch. The common mode cancellation circuit generates a common mode rejection signal in response to the first and fourth current signals. A first current hysteresis comparator receives the first and fourth current signals, the common mode rejection signal, and a drive signal to generate a first output signal. A drive signal generated in response to the first output signal in a presence of a common mode voltage caused by slewing at a half bridge node.

Abstract: A power converter controller includes a high side signal interface circuit that includes a common mode cancellation circuit that is coupled to generate a fourth current signal representative of an OFF signal referenced to a bypass voltage during an initial state, and a first current signal in response to an ON signal being pulled to a lower value relative to the OFF signal to turn ON a high side switch. The common mode cancellation circuit generates a common mode rejection signal in response to the first and fourth current signals. A first current hysteresis comparator receives the first and fourth current signals, the common mode rejection signal, and a drive signal to generate a first output signal. A drive signal generated in response to the first output signal in a presence of a common mode voltage caused by slewing at a half bridge node.

Abstract: A controller for use in a power converter includes a control circuit coupled to generate a low side drive signal to control switching of a low side switch, and generate an ON signal and an OFF signal in response to a feedback signal representative of an output of the power converter. A high side signal interface circuit is coupled to generate a high side drive signal in response to the ON signal and the OFF signal to control switching of a high side switch. The ON signal and the OFF signal are coupled to be pulled up in response to a bypass voltage during an initial state. The high side signal is coupled to turn on the high side switch in response to the control circuit pulling the ON signal low, and turn off the high side switch in response to the control circuit pulling the OFF signal low.

Abstract: A device includes an over-temperature protection circuit configured to protect against over-temperature. The over-temperature protection circuit is coupled to receive a signal representative of temperature at the temperature sensor. The over-temperature protection circuit is coupled to adjust a temperature at which over-temperature protection is triggered based at least in part on a rate of change of the temperature at the temperature sensor.

Abstract: A power supply controller controls power supplies for power-up and/or shut-down in a desired sequence. An input voltage for the power supplies powers, and is monitored by, a first control unit having outputs for enabling the power supplies. A second control unit monitors output voltages of the power supplies, and an isolating signal coupler couples signals in both directions between the first and second control units. The second control unit is powered in an isolated manner from the input voltage, conveniently via a transformer constituting the signal coupler. The control units together respond to the monitored voltages for enabling the power supplies in accordance with the desired sequence, information for which can be stored in a non-volatile store. The second control unit can also include enable outputs isolated from the input voltage, and trim outputs for adjusting the monitored voltages.

Abstract: A power supply controller controls power supplies for power-up and/or shut-down in a desired sequence. An input voltage for the power supplies powers, and is monitored by, a first control unit having outputs for enabling the power supplies. A second control unit monitors output voltages of the power supplies, and an isolating signal coupler couples signals in both directions between the first and second control units. The second control unit is powered in an isolated manner from the input voltage, conveniently via a transformer constituting the signal coupler. The control units together respond to the monitored voltages for enabling the power supplies in accordance with the desired sequence, information for which can be stored in a non-volatile store. The second control unit can also include enable outputs isolated from the input voltage, and trim outputs for adjusting the monitored voltages.