LM74900-Q1: LM74900-Q1

Hi Sam,

Welcome to e2e!

What are the features that you are looking for?

LM74900-Q1 has features like:

• Reverse polarity protector.
• Reverse current blocking.
• Over current protection.
• Short circuit protection.
• Under voltage and overvoltage protection.
• Current monitoring.

Can you list your requirements?

Regards,

Shiven Dhir

Hi Shiven

1.Is block diagram connection is correct? 

2. Application Note Addressing Automotive Reverse Battery Protection Topologies with LM749x0-Q1 page 9

3.. In the absence of the primary supply or when the primary supply drops to a specified undervoltage level, then the downstream should switch over to the auxiliary power path. see my pdf

Please advice 

regards

Sam

Hi Sam,

For block diagram, let me check with our systems engineer.

Regards,

Shiven Dhir

Hi Sam, 

Your block diagram has one more gate driver (other than LM74900-Q1)

Why is it being used? If it is for ON/OFF functionality, LM74900-Q1 has it.

Other than that, the chosen controller is fine, and connections look fine.

Regards,

Shiven Dhir

Hi Shiven

1. See PWR551A_Sht01.SchDoc UCC27524AD On schematic UCC27524AD use as gate driver.

2. On the schematic what is purpose Q1, Q2, Q3, Q4 is this bridge rectifier?

Please advice

Regards

Hi Shiven

. See UCC27714EVM-551 schematic.

2. On the schematic what is the purpose Q1, Q2, Q3, Q4 is this bridge rectifier?

Please advice

Regards

Sam