The R1223N XXXB type, which is without a PWM/VFM alternative circuit, is also available. If the term of maximum
duty cycle keeps on a certain time, the embedded protection circuit works.
There are two types of protection function. One is latch-type protection circuit, and it works to latch an
external Power MOSFET with keeping it disable. To release the condition of protection, after disable this IC
with a chip enable circuit, enable it again, or restart this IC with power-on. The other is Reset-type protection
circuit, and it works to restart the operation with soft-start and repeat this operation until maximum duty
cycle condition is released. Either of these protection circuits can be designated by users’ request.
Range
of Input Voltage 
