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Número de pieza | CN5611 | |
Descripción | Low-Dropout High-Power LED Driver | |
Fabricantes | CONSONANCE | |
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Low-Dropout High-Power LED Driver
CN5611
General Description:
The CN5611 current regulator operates from a 2.7V
to 6V input voltage range and delivers a constant
current that is up to 800mA to high-brightness LEDs,
including high-brightness white LED. The LED
current of CN5611 can be adjusted from 30mA to
800mA by using an external resistor. An on-chip
pass element minimizes external components while
providing ±8% output current accuracy. Additional
features include over temperature protection, LED
short and open protection.
The CN5611 is available in a thermally enhanced
5-pin SOT89 package.
Applications:
High-Power LED Driver
LED Cap-Lamp
Flash Light and Lighting
Cell Phone, DSC and MP3 Player
LCD and Keyboard Backlight
Features:
Operating Supply Voltage Range: 2.7V to 6V
On-chip Pass Element
Low-Dropout Voltage
Adjustable Output Current up to 800mA
Output Current Accuracy: ±8%
Over Temperature Protection
LED Open/Short Protection
Operating Temperature Range:
-40℃ to 85℃
Available in 5-pin SOT89 Packages
Pb-free
Pin Assignment
VDD 1
GND 2
5 NC
CN5611
LED 3
4 ISET
Typical Application Circuit
Input Supply Voltage 2.7V to 6V
RISET
VDD
CN5611
ISET
LED
GND
LED
Figure 1 Typical Application Circuit
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REV 1.2
1
1 page VIN
R1
LED
VDD
LED
RISET
CN5611
LED
D1
ISET
LED
GND
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Figure 4 Drive Multi-LEDs from a High Voltage Sources
In the circuit of Figure 3 and Figure 4, care must be taken to make sure that the voltage at CN5611’s LED pin
should be kept less than 6V under any conditions.
In the circuit of Figure 4, D1 is the zener diode whose breakdown voltage is between 2.7V to 6V. R1’s resistance
should be small enough so that the current flowing through R1 is greater than 3mA under worst case.
For more application circuits, please refer to “CN5611-CN5612 Application Circuit Collection”.
Dimming Control
There are 3 different ways of dimming control:
1. Using a PWM signal for dimming control as shown in Figure 5
VDD(2.7V to 6V)
PWM
Signal
RISET
M1
VDD
CN5611
ISET
LED
GND
Figure 5 Dimming Control by Using PWM Signal
With PWM signal applied to the gate of N channel MOSFET M1, the LEDs operate at either zero or full current.
The average LED current decreases with the increasing duty cycle of PWM signal. A 100% duty cycle will turn
off LEDs completely, a 0% duty cycle corresponds to full LED current. The frequency of PWM signal should be
under 10KHz.
REV 1.2
5
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet CN5611.PDF ] |
Número de pieza | Descripción | Fabricantes |
CN5610 | Switch-Mode High-Brightness LED Driver | CONSONANCE |
CN5611 | Low dropout power light emitting diode (LED) driver IC | ETC |
CN5611 | Low-Dropout High-Power LED Driver | CONSONANCE |
CN5612 | Low-Dropout High-Power LED Driver | CONSONANCE |
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