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This application note describes the design of the PWM buck-boost converters using ROHM’s AC/DC converter IC BM2Pxxx series devices. It explains the selection of external components and provides PCB layout guidelines. Please note that all performance characteristics have to be verified. They are not guaranteed by the PCB layout shown here.

● Description

The BM2Pxxx series of ICs are AC/DC converters for PWM switching, incorporating a built-in starter circuit having withstanding voltage  of  650V  and  a  switching  MOSFET  having  withstanding  voltage  of  650V.  With  ROHM’s  original  high-speed  switching  MOSFET  built  inside,  it  is  possible  to  increase  the  peak  current,  contributes  to  miniaturization  of  the  magnetic  components.  BM2Pxxx supports both isolated and non-isolated circuits, enabling simpler design of various types of low-power converters.

● Key features

-    PWM frequency 65kHz (with frequency-hopping function)/ Current mode   

-    Burst-operation and frequency reduction functions when load is light

-    Built-in 650V starter circuit / Built-in 650V switching MOSFET

-    VCC pin under-voltage protection/Over-voltage protection   

-    SOURCE pin Open/ Short protection, Leading-Edge-Blanking function

-    Per-cycle over-current limiter function

-    Over-current limiter AC correction function

-    Soft-start  function

● BM2Pxxx Series line-up

1. Design Example of Non-Isolated Type Buck-Boost Converter DCM (Discontinuous Conduction Mode)

……未完待续……

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