Part Number: CL6807
Function: 30V, 1A, LED driver
Package: SOT89-5 Pin Type
Manufacturer: Chip Link
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Description
The CL6807 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 30V and provides an externally adjustable output current of up to 1A. Depending upon supply voltage and external components, this can provide up to 35 watts of output power. The CL6807 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted above, or below the set value, by applying an external control signal to the ‘ADJ’ pin. The ADJ pin will accept either a DC voltage or a PWM waveform. Depending upon the control frequency, this will provide either a continuous or a gated output current. The PWM filter components are contained within the chip. The PWM filter provides a soft-start feature by controlling the rise of input/output current. The soft-start time can be increased using an external capacitor from the ADJ pin to ground. Applying a voltage of 0.5V or lower to the ADJ pin turns the output off and switches the device into a low current standby state. Features Simple low parts count Wide input voltage range: 8V to 30V Up to 1A output current Single pin on/off and brightness control using DC voltage or PWM Typical 5% output current accuracy Inherent open-circuit LED protection High efficiency (up to 95%) High-Side Current Sense Soft-start Available in SOT89-5 packages Applications Low voltage halogen replacement LEDs Automotive lighting Low voltage industrial lighting LED back-up lighting Illuminated signs TYPICAL Applications PIN ASSIGNMENT 2008-09-09 1 http://www.chiplink-semi.com CHIPLINK SEMICONDUCTOR CL6807 PIN DescriptionSPIN NO. 1 2 3 PIN NAMES LX GND ADJ Description Drain of the internal N-Ch MOSFET switch. Ground. Multi-function On/Off and brightness control pin: • Leave floating for normal operation (VADJ was internal pulled up) .average output current IOUTnom = 0.1/RS) • Drive to voltage below 0.4V to turn off output current • Drive with DC voltage (0.5V < VADJ < 2.5V) to adjust output current from 0% to 100% of IOUTnom • Drive with PWM signal from open-collector or open-drain transistor, to adjust output current. Adjustment range 25% to 100% of IOUTnom for f>10kHz and 1% to 100% of IOUTnom for f < 500Hz • Connect a capacitor from this pin to ground to increase soft-start time. Current sense input Input Supply Pin. Must be locally bypassed 4 5 ISNS VIN ABSOLUTE MAXIMUM RATINGS (note1) SYMBOL VIN SW ISNS ADJ PDMAX PTR TJ TSTG ITEMS Supply Voltage Drain of the internal power switch Current sense input (Respect to VIN […]