BM2P129TF-EVK-002: 2W, -12V @ 167mA, 90 ~ 264 VAC in


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 Ω 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.


Manufacturer Rohm Semiconductor
Category AC/DC and DC/DC Conversion
Sub-Category AC/DC SMPS - Single Output
Eval Board Part Number BM2P129TF-EVK-002-ND
Eval Board Supplier Rohm Semiconductor
Eval Board Normally In Stock
AC Voltage Universal (115 / 230V)
Outputs and Type 1 Non-Isolated
Voltage Out -12 V
Current Out 167 mA
Output Power 2 W
Features Current Limit (Adj. or Fixed)
Frequency Hopping
Light Load Mode
Over Current Protection
Over Voltage Protection
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Efficiency @ Conditions >70%, 230 VAC, -12V @ 85 ~ 200 mA
>70%, 100 VAC in, -12V @ 30 ~ 200 mA
No-load Input Power @ Voltage 30 mW @ 230 VAC
Switching Frequency 100 kHz
Internal Switch Yes
Component Count + Extras 14 + 3
Voltage In 90 ~ 264 VAC
Design Author Rohm
Application / Target Market HVAC
Lighting: LED Commercial Lighting
Lighting: LED Home Lighting
White Goods
Main I.C. Base Part BM2P129TF
Date Created By Author 2018-03
Date Added To Library 2019-10

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