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PDF CL6807 Data sheet ( Hoja de datos )
| Número de pieza | CL6807 | |
| Descripción | 30V 1A LED driver | |
| Fabricantes | Chip Link | |
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CHIPLINK
SEMICONDUCTOR
CL6807
30V 1A LED driver with internal switch
GENERAL 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
TYPICAL APPLICATIONS
APPLICATIONS
◆ Low voltage halogen replacement LEDs
◆ Automotive lighting
◆ Low voltage industrial lighting
◆ LED back-up lighting
◆ Illuminated signs
PIN ASSIGNMENT
2008-09-09
1
http://www.chiplink-semi.com
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
CHIPLINK
SEMICONDUCTOR
CL6807
LED current.
The ADJ pin can be driven by an external dc voltage(VADJ) to adjust the output current to a value
belowthe nominal average value defined by RS.
High luminance LEDs often need to be supplied with atemperature compensated current in
order to maintainstable and reliable operation at all drive levels. The LEDs are usually mounted
remotely from the device so,for this reason, the temperature coefficients of theinternal circuits for
the CL6807 have been optimized tominimize the change in output current when nocompensation is
employed. If output currentcompensation is required, it is possible to use anexternal temperature
sensing network - normally using Negative Temperature Coefficient (NTC) thermistors and/or
diodes, mounted very close to the LED(s). Theoutput of the sensing network can be used to drive
the ADJ pin in order to reduce output current with increasing temperature.
Undervoltage Lockout (UVLO)
The CL6807 include a 7V undervoltage lockout (UVLO) with 500mV hysteresis. When VIN falls
below 7V, turning off the internal n-channel MOSFET. MOSFET is on once VIN is 7.5V or higher.
5V Regulator
VCC is the output of a 5V regulator capable of sourcing 10mA. VCC was bypassed to GND with
internal capacitor.
ADJ Input
The CL6807 allow dimming with a PWM signal at the ADJ input. A logic level below 0.5V at ADJ
turns off the LED current. To turn the LED current on, the logic level at ADJ must be at least 2.5V.
APPLICATION DESCRIPTION
Selecting RSENSE to Set the LED Current
The CL6807 feature a programmable LED current using a resistor connected between VIN and
ISNS. Use the following equation to calculate the sense resistor:
I out
=
0.1 × V ADJ
2.5 × Rs
(0.5V
≤ V ADJ
≤ 2.5V )
Current Regulator Operation
The CL6807 regulate the LED output current using an input comparator with hysteresis (Figure
1). As the current through the inductor ramps up and the voltage across the sense resistor reaches
the upper threshold, turns off the internal MOSFET. The MOSFET turns on again when the inductor
current ramps down through the freewheeling diode until the voltage across the sense resistor
equals the lower threshold. Use the following equation to determine the operating frequency:
f sw
=
(VIN
− n × VLED ) × n × VLED
VIN × ΔV × L
× RSENSE
where n = number of LEDs, VLED = forward voltage drop of one LED, and ΔV = (VSNS_HI -
VSNS_LO).
2008-09-09
5
http://www.chiplink-semi.com
Datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CL6807.PDF ] | |
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