Current Mode PWM Controller 8-Pin SOIC T/R

The NCL30083 is a PWM current mode controller targeting isolated flyback and non-isolated buck-boost constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. The device supports 5 step log dimming down to 5%. To enhance system lifetime, it has current foldback at a user programmable temperature point. While the NCL30083 has integrated fixed overvoltage protection, the designer has the option to program a lower overvoltage protection level.

• Primary Side Sensing
• Wide V_CC Range
• Precise LED Current Regulation of ±1% typical
• ~ 0.9 power factor with passive valley fill
• User Programmable Thermal Foldback
• Open and Shorted Output Protection
• Secondary Diode Short Protection
• 5 Step Dimmable to < 5% output current
• V_CC undervoltage and overvoltage protection
• Latched (A version) and Auto-recoverable (B version) fault handling
• Wide temperature range of -40 to 125 °C
• Input Line Voltage Sensing
• Programmable Soft start