CSD19536KTT: max allowed body diode current under 10us, 100us, 1ms duration

Shen Dong

Part Number: CSD19536KTT

I am writing to see if there is any max tolerated body diode current for this part. the pulse duration can be 10us, 100us, 1ms.

thanks,

Shen

over 1 year ago

0 John Wallace1 over 1 year ago

TI__Mastermind 38940 points

Hello Shen,

Thanks for your interest in TI FETs. In general the body diode has the same current rating as the FET when it is turned on. However, it is limited by the power dissipation: Isd x Vsd. This is typically greater than the I² x Rds(on) conduction loss when the FET is on. There is an application brief at the first link below that explains how to calculate the continuous current capability of the body diode. For pulsed current, we would need to use the normalized transient thermal impedance graph in Figure 1 in the datasheet to calculate the body diode current. Is this for single pulse or can it be repetitive pulses and if so, what duty cycle? Also, please let me know the maximum allowable PCB (case) temperature and I can help you with the calculations if you would like. The second and third links explain how TI specs continuous and pulsed current ratings for our FETs.

Body diode current capability

MOSFET continuous current rating

MOSFET pulsed current rating

Best Regards,

John Wallace

TI FET Applications