The ZLED7730 continuous-mode inductive step-down converter is one of our ZLED LED-control ICs. It is designed for applications requiring high brightness and high current. The ZLED7730 can efficiently drive a single LED or multiple series-connected LEDs from a voltage input higher than the LED forward voltage (Vin = 8.5 to 40VDC). It provides an adjustable output current (up to 0.35A), which is set via an external resistor and controlled by the ZLED7730’s integrated high-side output current-sensing circuit and high speed internal 40V power switch. Its low conducting impedance ensures high system effi­ciency.

The ZLED7730 provides a switch dimming func­tion. It detects external switch action to adjust out-put current, allowing dimming functionality to be achieved without changing the original lighting sys­tem circuitry.
The switch dimming is implemented in either two-level mode or three-level mode. The output current of every level and the total number of levels are customer selected by setting the corresponding input conditions of DIM1 and DIM2 pin.

The ZLED7730 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit protection. The ZLED7730 can also minimize bill-of-material costs because very few external components are required for most applications. Only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application.

• Switch dimming with multiple levels
• Three modes for output level settings
• Up to 0.35A output current
• Internal 40V power switch
• Wide DC input voltage range 8.5 to 40 VDC
• Output current accuracy: 5% (typical)
• LED open-circuit protection
• Thermal shutdown protection

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• High efficiency: up to 98%
• Very few external components needed for operation
• Adds switch dimming function to existing installation