BI3101A Dual PWM CCFL Controll

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.