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