Trouble understanding the FP5139BWR-LF pin 4

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sulfur101

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hello every one i am trying to understand the BR/CTL pin on the FP5139BWR-LF IC for a buck boost converter.
so what i am confused about is the control where is it coming from and will i be able to get it



also my design is below if you find any issues that i cant catch, the inductors L6, L2 are supposed to be iron core but this is what i can find at the moment.

 

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as you can see from the examples on the datasheet, you can implement an ON/OFF switch with an external transistor on the pin 4.
you can omit that external control, just by placing a Resistor (390 ohm) from pin 4 to GND. (always ON)
 

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Your schematic looks broken, particularly the Vout and FB path. Consider that a boost converter without operational feedback can easily destroy the switcher transistor.
 

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