General
The quasi-resonant controller typed AC/DC converter IC
“BM1Q104FJ" provides an optimum system for all
products that include an electrical outlet. The
quasi-resonant operation enables soft switching and
helps to keep EMI low. As MOSFET for switching and
current detection resistors are external devices, a higher
degree of design freedom is achieved.
IC builds in HV starter circuit that tolerates high voltage,
it contributes to low consumption power and high speed
start. Because IC consumption current is very low and
burst operation in light load, the stand-by power is very
low.
IC controls to switch bottom numbers in response to
loads. And IC builds in harsh sound prevention function of
transformer in burst operation.
Because IC builds-in soft-start, burst mode, over current
limiter which is cycle-by-cycle, over load protection, over
voltage protection, CS open protection and so on, IC
provides safety.

Features
Quasi-resonant method
Built-in 650V tolerate start circuit
Low consumption power in light load
Bottom skip control
Sound of transformer reduction function
Harsh sound prevention of transformer function
VCC pin : under voltage protection
Over-current protection (cycle-by-cycle)
OUT pin : H voltage 12.5V clamp
Soft start
ZT trigger mask function
ZT Over voltage protection
FB Over Load protection [Auto-restart]
CS pin open protection [Auto-restart]

Applications
Printer, Copy machine, AC adapter, etc