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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
specifications
| 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 |
remarks:
*1 please adjust operating time, within any parts surface temperature under 105 °c
*2 not include spike noise
*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 | |
| 1 | ||
| 1 | ||
| 1 |
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 | - |