ROHM Solution Simulator
Power Device Use’s Guide
for PFC Circuits
1/11
© 2017 ROHM Co., Ltd.
No. 60AP001E Rev.001
2017.4
© 2020 ROHM Co., Ltd.
No. 63UG054E Rev.001
NOV. 2020
User’s Guide
ROHM Solution Simulator
Power Device User’s Guide for PFC Circuits
Introduction
This user's guide summarizes the basic adjustment methods and know-how of each parameter so that users can fully utilize
the PFC circuit of the "Power Device Solution circuit". We introduce specific solutions for each theme that is likely to be a bottleneck
in designing a PFC circuit. Please use it as a reference when facing a trouble like "the circuit does not work well" or "need to
optimize the circuit conditions more".
In addition, "inverter edition" and "DC-DC converter edition" will be released later, so please use them as well.
Index
1. PFC circuit list - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - p.1
2. Adjustment of Inductance L - - - - - - - - - - - - - - - - - - - - - - - - - p.2
3. Adjustment of switching frequency fsw - - - - - - - - - - - - - - - - - p.4
4. Consideration of appropriate gate drive voltage Vgs - - - - - - - -p.6
5. Optimization of gate resistance Rg - - - - - - - - - - - - - - - - - - - - p.8
6. Optimum value of dead-time - - - - - - - - - - - - - - - - - - - - - - - - p.10
1. PFC circuit list
Table 1 shows the PFC circuits registered in "Power Device Solution circuit". Reference circuits cover commonly used 4
categories such as “Boundary Current Mode (BCM)”, ”Continuous Current Mode (CCM)”, “Discontinuous Current Mode (DCM)”
and high-power “3-phase PFC”. In addition to the basic “single boost PFC” various reference circuits are prepared such as
”Interleaved PFC”, “synchronous rectification”, “bridgeless”, and “Totem-pole”, so please use them according to your needs.
Table 1. List of PFC circuits in Power Device Solution Circuit
PFC 3-Phase
Class
ID
Number
Circuit name
PFC Boundary Current Mode
(BCM)
PFC Continuous Current Mode
(CCM)
PFC Discontinuous Current Mode
(DCM)