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UCC5350: UCC5350 drive a 40V MOS

zhixia bai
Prodigy 100 points
Part Number: UCC5350


Hi，teams

The following is the UCC5350 specification. When the chip uses 3.3V power supply and the input high level is 3.3V, if there is a little burr in the input at this time, it may exceed VCC1+0.3V and cause chip damage. Please assess whether there is any risk. And does the chip support powering a 40V MOS?

Best regards，

Zhixia Bai

  • 0
    TI__Genius 13760 points

    Hi Zhixia,

    We cannot guarantee operation outside of the abs max voltage specs of the device. I order to provide if the input voltage exceeds the abs max spec of VCC1 + 0.3V the gate driver may get damaged. The 0.3V margin accounts for noise that can be seen on the pin during operation. A magnitude of noise greater than 0.3V would likely affect more than just the input. It could also affect the VCC1 input meaning that during a high noisy event the input pin may raise to 3.7V(Assuming 3.3V logic), but at this same point in time VCC1 could also see the noise causing the voltage at VCC1 to rise higher than 3.3V allowing the system to stay within datasheet abs max ratings. For deeper analysis we would need details of the specific transient you are concerned about(Amplitude and duration of the input voltage being >VCC1+0.3V).

    If you mean in the gate driver is able to apply 40V from positive to negative bias voltages to the gate (VCC2-VEE2) it cannot. The driver can only operate at a max recommended voltage from VCC2-VEE2 = 33V.

    If you mean the bus voltage(Voltage seen from Drain to Source of the MOSFET) then the gate driver will not have any problem as long as the voltage applied to the gate remains withing the datasheet recommended voltages (Recommended max VCC2-VEE2 = 33V).

    Best regards,

    Andy Robles