rohm referencedesigns


refacdc009reference design / application evaluation kit | rohm co., ltd.-ag旗舰平台尊龙

non-isolation buck converter pwm method output 2w -12v

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.

design resources

  • bm2p129tf-evk-002


board number input voltage input frequency output voltage maximum output power output current range stand-by power efficiency output ripple voltage size operating temperature
bm2p129tf-evk-002 90 to 264vac 47 to 63hz -12v(typ.) 2w iout=167ma 2 to 167ma *1 44mw iout=0a 0.722 29mvpp *2 25mm x 45mm -10 to 65deg.c
*1 please adjust operating time, within any parts surface temperature under 105 °c
*2 not include spike noise

distribution inventory

board number distributor quantity available
bm2p129tf-evk-002 2

key components

board number part number product category datasheet status spice ltspice thermal model symbol & footprint 3d step samacsys ecad library calc tool rohm solution simulator
bm2p129tf-evk-002 bm2p129tf ac/dc converters ics recommended -
bm2p129tf-evk-002 rfn1lam6s fast recovery diodes recommended -
bm2p129tf-evk-002 rre02vsm6s rectifier diodes recommended -