LM7480-Q1: Is the "LM7480-Q1" enough for complaining with the ISO-16750-2 and cover the reverse-polarity protection?

Javier Pindter

Part Number: LM7480-Q1
Other Parts Discussed in Thread: LM74610-Q1, INA302-Q1

Hello, experts

After reading several posts and the application report (SLVAES2-April 2020) I still have some doubts regarding the configuration of the LM7480-Q1 that I believe is the best option to suit my requirement of having a reverse-polarity protected DC/DC in compliant with the ISO-16750-2.

In general the system will be used for 24V applications with a operating range between 18V - 38V and a max current of 150A.

By using the common-source topology (Design 3, Figure 10) the surge-stop protection is covered. However, the other conditions (OCP, reverse polarity, etc.) are covered with the common-drain topology + the INA302-Q1 (Design 4, Figure 13). So, with that been said, is it possible to cover all the requirements with a single LM74800 or an extra "help" is needed, for instance, an LM74610-Q1 is required for the reverse-polarity protection?

Thanks in advance!

over 4 years ago

0 Praveen GD over 4 years ago

TI__Guru 57737 points

Hi Javier,

LM7480-Q1 alone when used in common-source topology (as shown below) can support ISO 7637-2 and ISO 16750-2 including 200-V unsuppressed load dump Pulse 5 A and –600-V 50-Ω ISO-7637 Pulse 1 and reverse polarity protection.

LM7480-Q1 inherently does not support Over current protection. So, in case you want OCP, you will have to use a circuit similar to shown in Automotive transient and overcurrent protection filter reference design .This design may have common-drain configuration but the same can be achieved with common-source topology.

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LM7480-Q1: Is the "LM7480-Q1" enough for complaining with the ISO-16750-2 and cover the reverse-polarity protection?