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WEBENCH® Tools: TPS56121DQPR

Other Parts Discussed in Thread: TPS56121

Tool/software: WEBENCH® Design Tools

I have designed DC to DC converter design using WEBENCH reference design (webench_design_4818414_1_715752205) but after the populating the components over the PCB I am getting only 4V DC output though the reference design is for 7.7V/ 10A 

Here's the voltage readings at various nodes in the circuit, Please suggest if there is a problem in the webench design circuit 

 

Test board

Pin 22 (PGD)

0V

Pin 21 (EN/SS)

0V

Pin 4 (BOOT)

Switching pulses with 4.4V DC

Pin 18 (ILIM)

0V

Pin 19 (BP)

6.2V

Pin 20 (VDD)

12V

Pin 1 (COMP)

0.6V

Pin 2 (FB)

0V

Pin 6 (SW)

4V DC