This post describes for the LED Driver. An LED driver is an electronic device that regulates and controls the power supplied to light-emitting diodes (LEDs).
The Part Number is CL6808.
The package is SOT89-5 type.
The function of this semiconductor is 1.2A LED driver with internal switch.
The manufacturer of this part is CHIPLINK.
See the preview image and the PDF file for more information.
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Description
The CL6808 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 7V and 40V and provides an externally adjustable output current of up to 1.2A. Depending upon supply voltage and external components, this can provide up to 35 watts of output power. The CL6808 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current.
Features
- Wide input voltage range: 6V to 35V
- Adjustable constant output current up to 1.2A
- Integrated power switch (no external MOSFET required)
- High efficiency: up to 95%
- High-side current sensing using external resistor
- Simple design with low external component count
- Single-pin control for ON/OFF and brightness (DC or PWM dimming)
- Soft-start function to limit inrush current
- Typical ±5% LED current accuracy
- Inherent open-circuit LED protection
Design Notes
- Inductor selection is critical: choose based on ripple current (typically 20–40% of ILED)
- Use low ESR capacitors to reduce output ripple and improve stability
- Schottky diode is recommended for higher efficiency
- PWM dimming frequency should be chosen to avoid visible flicker (>1 kHz typical)
- Thermal design is important at high currents—ensure adequate copper area for heat dissipation
- Layout should minimize loop area of switching path to reduce EMI
Block Diagram
Advantages
- Minimal external components → reduced BOM cost
- Integrated switch simplifies design
- High efficiency improves thermal performance
- Flexible dimming control (analog + PWM)
- Robust protection features
Typical Applications
- LED retrofit lamps (halogen replacement)
- Automotive lighting systems
- Industrial LED lighting
- Emergency and backup lighting
- Signage and display illumination
Alternative / Equivalent Products
- PT4115 – Popular LED buck driver (lower power range)
- HV9910 – Offline/high-voltage LED driver
- LM3404 – TI constant current LED driver
- AL8805 – Diodes Inc. LED driver
- MP24833 – MPS LED driver IC
CL6808 PDF Datasheet
