Users Guide AC/DC Converter Non-Isolation Buck Converter PWM method Output 2W -12V BM2P129TF Reference Board BM2P129TF-EVK-002 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 650 V 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 9.5 650 V MOSFET built-in contributes to low power consumption and easy design. The flywheel diode is a fast recovery diode of 1A/650 V RFN1LAM6S, contributing to low power consumption. Electronics Characteristics Not guarantee the characteristics, is representative value. Unless otherwise noted :V = 230Vac, I = 120mA, Ta:25 IN OUT Parameter Min Typ Max Units Conditions Input Voltage Range 90 230 264 Vac Input Frequency 47 50/60 63 Hz Output Voltage -13.2 -12.0 10.8 V Maximum Output Power - - 2.0 W I = 167mA OUT Output Current Range 2 120 167 mA (NOTE1) Stand-by Power - 44 - mW I = 0A OUT Efficiency - 72.2 - % Output Ripple Voltage - 29 - mVpp (NOTE2) Operating Temperature -10 25 65 Range (NOTE1) Please adjust operating time, within any parts surface temperature under 105 (NOTE2) Not include spike noise 2018 ROHM Co., Ltd. No. 60UG070E Rev.001 1/8 2018.3BM2P129TF-EVK-002 Users Guide Operation Procedure 1. Operation Equipment (1) AC Power supply 90Vac264Vac, over 10W (2) Electronic Load capacity 0.167A (3) Multi meter 2. Connect method (1) AC power supply presetting range 90~264Vac, Output switch is off. (2) Load setting under 0.167A. Load switch is off. (3) AC power supply N terminal connect to the board AC (N) of CN1, and L terminal connect to AC(L). (4) Load + terminal connect to VOUT1, GND terminal connect to GND1 terminal (5) AC power meter connect between AC power supply and board. (6) Output test equipment connects to output terminal (7) AC power supply switch ON. (8) Check that output voltage is -12V. (9) Electronic load switch ON (10) Check output voltage drop by load connect wire resistance AC + Power Power Electronic V Supply Meter Load CN1 : from the top :AC (L), :AC (N) Multi Meter Figure 1. Connection Circuit Deleting Maximum Output Power Po of this reference board is 2W. The derating curve 2.5 is shown on the right. 2.0 if ambient temperature is over 50, please adjust load continuous time by 1.5 over 105 of any parts surface temperature. 1.0 0.5 0.0 -25 0 25 50 75 100 Ambient Temparature Ta Figure 2. Temperature Deleting curve 2018 ROHM Co., Ltd. No. 60UG070E Rev.001 2/8 2018.3 Output Power Po W