REFACDC009 - Reference Design

The BM2P129TF-EVK-002 evaluation board outputs -12V minus voltage from the input of 90Vac to 264Vac. The output current supplies up to 0.167A. BM2P109TF which is PWM method DC/DC converter IC built-in 650V MOSFET is used. The BM2P129TF contributes to low power consumption by built-in a 650V starting circuit. Built-in current detection resistor realizes compact power supply design.

• Current mode control imposes current limitation on every cycle, providing superior performance in bandwidth and transient response.
• The switching frequency is 100 kHz in fixed mode. At light load, frequency is reduced and high efficiency is realized.
• Built-in frequency hopping function contributes to low EMI. Low on-resistance 9.5Ω 650V MOSFET built-in contributes to low power consumption and easy design.
• The flywheel diode is a fast recovery diode of 1A/650V RFN1LAM6S, contributing to low power consumption.