The NCL30105 is a peak current controlled fixed off time buck controller designed for LED driver applications. It is optimized to operate in deep continuous conduction mode eliminating the need for output electrolytic capacitors. Featuring an adjustable off time generator, the controller can drive a MOSFET up to a switching frequency of 500 kHz. A dedicated dimming pin enables the use of a pulsewidth modulated logic signal to dim the LED directly. The soft-start pin creates a startup sequence that slowly ramps up the peak current and enables the adjustment of the peak current set point for analog dimming control. The device features robust protection features to detect switch overcurrent faults and to detect maximum on time events.
Features | | Benefits
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Constant off time current mode control
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No loop compensation required
Adjustable off time (0.5 to 10 µs)
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Easily adjust operating frequency and output ripple
Internal leading edge blanking
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Avoids false triggering during FET turn on
± 5% current sense accuracy
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Accurate LED current regulation
Internal Startup Delay
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Ensure stable operation during initial system turn on
PWM or Analog Dimming Control
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Flexible support for dimmable LED lighting applications
