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TPS62133: MAX CURRENT THROUGH THE BODY DIODE OF THE INTERNAL MOSFET HALFBRIDGE?

Werner Vontobel
Prodigy 10 points
Part Number: TPS62133

Tool/software:

On the +5V-Output of the TPS62133 power supply is a raspberry 3B+ connected. In some cases the raspberry can parallel powered over usb-c connector with an external 5.2V/2.4A power supply. 
The external 5.2V power supply and also the Input-power supply (8V2) of the TPS62133 are powered from a main 24V power supply.
During power on/off-cycle in a short time (max 50ms) power (max 1A) can flow over the body diode of the TPS62133.
In the datasheet of TPS62133 we found no specification of the body diode!

Can somebody give us the specification of the body diode of TPS62133?
How is the TPS62133 behavior during reverse Voltage source (output voltage is higher then input voltage)?

Thank you for help.

  • 0
    TI__Mastermind 21141 points

    Hi,

    The buck converter has a dead time, and the current will flow through the body diode. Therefore, as long as the current is within the maximum output current range, the body diode is no problem.

    Vout is prohibited from being higher than VIN+0.3V, otherwise the body diode of the high-end mos will be turned on and the current will be very large.

    Thanks,

    Colin