Renesas ZLED7000

Description

The ZLED7000, one of our ZLED Family of LED control ICs, is an inductive step-down converter that is optimal for driving a single LED or multiple LEDs (connected in series) from a voltage source greater than the voltage rating of the LED. The ZLED7000 operates in continu-ous mode. Capable of operating efficiently with voltage supplies ranging from 6 VDC to 40 VDC, it is ideal for low-voltage lighting applications. The ZLED7000 minimizes current consumption by remaining in a low-current standby mode (output is off) until a voltage of ≥0.3V is applied to the ADJ pin.In operating mode, the ZLED7000 can source LEDs with an output current of ≤ 750mA (≤ 30 watts of output power) that is externally adjustable.* The ZLED7000’s integrated output switch and high-side current sensing circuit use an external resistor to adjust the average output current. Linearity is achieved via an external control signal at the ZLED7000’s ADJ pin, implemented either as a pulse-width modulation (PWM) waveform for a gated output current or a DC voltage for a continuous current.

Features

• Capable of up to 95% efficiency
• Operates in continuous mode with a wide input range from 6 VDC to 40 VDC
• Integrated 40V power switch
• One pin on/off or brightness control via PWM or DC voltage control signal input
• Switching frequency: ≤ 1MHz
• Dimming rate: 1200:1 (typical)
• Output current accuracy: 5% (typical)
• Built-in thermal shutdown and open-circuit protection for LED
• Very few external components needed for operation
• Broad range of applications: outputs up to ≤750mA
• SOT89-5 package

Remarks:

• Recom-mendation: Use inductors in the range of 15μH to 220μH with saturation current greater than 1A for 700mA output current or saturation current greater than 500mA for 350mA output current.

Typical applications

• Illuminated LED signs and other displays
• Architectural LED lighting, including low-voltage applications for buildings
• Halogen replacement LEDs (low-voltage)
• General purpose exterior and interior LED lighting, including applications requiring low-voltage
• LED backlighting
• General purpose low-voltage industrial applications
• LED traffic and street lighting (low-voltage)

More information

• Datasheet
• IC product information