ROHM BM1Q021AFJ-LBE2, 1-Channel, Quasi-Resonant Control DC-DC Converter, Driver 7-Pin, SOP-J7S

The ROHM Quasi resonant controller type DC/DC converter IC provides the optimal system for products with electrical outlets. For quasi resonant vibration operation, soft switching is realized, contributing to low EMI. The switching MOSFET and current sensing resistor are external, allowing for highly flexible power supply designs. This IC has a built in starter circuit that contributes to low standby power and high speed startup. When the IC is light load, the standby power is reduced due to the built in burst operation function and the lower current consumption of the IC.

Built in 650 v tolerate starter circuit
Maximum frequency 120 kHz
AC input voltage correction circuit
VCC pin under voltage protection
VCC pin over voltage protection
Over current protection circuit per cycle
Output driver 12 v clamp circuit
Soft start function
ZT pin trigger mask function