Variable Output 2-Cell 200W Heater Element Power Stage Buck/Boost Reference Design

PMP20327 is a synchronous 4-switch buck/boost converter using the LM5175 controller and can be used as a reference design for heater element power stages in applications such as e-cigarettes. Output voltages from 1V to 10V can be selected over a current range of 20A to 45A by using a trim resistor on the FB pin with a bias voltage of 0.2V to 3.1V. This design also uses the non-synchronous boost regulator LMR62014 to provide the bias voltage for the LM5175 operating in low input voltage mode. The current mode controller has built-in LM5175 pulse-by-pulse current limiting function. This board includes enable, sync, and power-good functions. The design supports resistive heating elements with resistances ranging from 0.1Ω to 0.5Ω, thus supporting a variety of 200W operating conditions.

characteristic

• ● 6V to 8.6V input voltage, providing 1V to 10V/20A to 45A output
• ● LM5175 boost/buck controller achieves over 90% efficiency under all operating conditions
• ● Compact size and slim appearance, suitable for electronic cigarettes
• ● Solution size: 26mm x 57mm
• ● Peak efficiency reaches 98%