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LM5149: Operating current of LM5149

Part Number: LM5149

I want to know the operating current of LM5149

My Operating is as mention below

Input Voltage 30 - 50V

Output Voltage - 28V, 5A

Problem is when i am using its internal regulator, it is generating heat due to wide voltage difference 

So to solve this problem i want to use an external LDO

For this i need current information

In total how much current LM5149 require to make it functional (VCC & VDDA)