To aim at the Cold Cathode Fluorescent Lamp (CCFL)
applications, the Bi3101A integrated all functions required
in a single 16-pin chip. The chip provides 2 fully
functioned PWM control circuit both with the true lamp
current feedback. By setting the required time for
striking the lamp through SST (Soft Start), the open-lamp
condition can be detected after lamp striking period.
ON/OFF control function will be very helpful for engineers
to prevent the non-necessarily system power shut down.
The lamp dimming can be done through this feedback
loop or, by setting the reference DC level of the input of
error amplifier. The reference DC level of dimming can
be selected as higher level for more brightness or lower
level for less brightness. CMOS process reduces the
operating current and NMOS output driving capability
enhances the system efficiency.