GENERAL DESCRIPTION
The PT4112 supports pulse width modulation (PWM) brightness dimming. A PWM signal input on the BRT pin could directly turn LED lights on/off. By freezing the circuit state during dimming off stage, the AC ripple on output ceramic capacitors is minimized across a wide duty cycle range; therefore reduce the potential audible noise. The PT4112 has multiple features to protect itself from fault conditions including built-in open lamp over voltage protection, cycle-by-cycle current limit, over temperature shutdown, input under voltage lock out and integrated soft-start. Additionally, PT4112 provides a driver output for an external PFET connected between the input and inductor. The PFET will be turned off by PT4112 to disconnect the battery from the WLEDs when severe error happens thus any leakage current of the battery is prevented. FEATURES
z z z z z z z z z z z z 5V to 25V wide input voltage range 1.2MHz switch frequency with dithering Integrated 1.5A 40V MOSFET Six-ch...
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