CL6808 LED driver Datasheet

CL6808 Datasheet, PDF, Equivalent


Part Number

CL6808

Description

1.2A LED driver

Manufacture

CHIPLINK

Total Page 8 Pages
Datasheet
Download CL6808 Datasheet


CL6808
CHIPLINK
SEMICONDUCTOR
CL6808
1.2A LED driver with internal switch
GENERAL DESCRIPTION
The CL6808 is a continuous mode inductive step-down converter, designed for driving single
or multiple series connected LE Ds efficiently from a voltage s ource higher than the LED voltage.
The device operates from an i nput supply betw een 7V an d 40V and p rovides an extern ally
adjustable output current of up to 1.2 A. 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.
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 40V
Up to 1.2A 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
TYPICAL APPLICATIONS
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
PIN ASSIGNMENT
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CL6808
CHIPLINK
SEMICONDUCTOR
CL6808
PIN DESCRIPTIONS-
PIN NO.
1
2
3
4
5
PIN NAMES
LX
GND
ADJ
ISNS
VIN
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
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)
Logic level dimming input
Power Dissipation (Note 2)
Thermal Resistance, SOT89-5 θJA
Operation Junction Temperature Range
Storage Temperature
ESD Susceptibility (Note 3)
VALUE
-0.3~40
-0.3~40
+0.3~(-5.0)
-0.3~6
Internally Limited
45
-40 to 150
-55 to 150
2
UNIT
V
V
V
V
W
°C /W
°C
°C
kV
RECOMMENDED OPERATING RANGE
SYMBOL
VIN
TOPT
ITEMS
VDD Supply Voltage
Operating Temperature
VALUE
0 ~ 30
-40 to +85
UNIT
V
°C
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Recommended Operating Range indicates conditions for which the device is functional, but do not
guarantee specific performancelimits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which guarantee specific performance limits. This
assumes that the device is within the Operating Range. Specifications arenot guaranteed for
parameters where no limit is given, however, the typical value is a good indication of device
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Features CHIPLINK SEMICONDUCTOR CL6808 1.2A LED driver with internal switch GENERAL DE SCRIPTION The CL6808 is a continuous mo de inductive step-down converter, desig ned for driving single or multiple seri es connected LE Ds efficiently from a v oltage s ource higher than the LED volt age. The device operates from an i nput supply betw een 7V an d 40V and p rovi des an extern ally adjustable output cu rrent of up to 1.2 A. Depending upon su pply voltage and external components, t his can provide up to 35 watts of outpu t 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 ou tput current. Output current can be adj usted 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 o r a gated output current. The PWM filter components are contain.
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