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PDF CN5612 Data sheet ( Hoja de datos )

Número de pieza CN5612
Descripción Low-Dropout High-Power LED Driver
Fabricantes CONSONANCE 
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CONSONANCE
Low-Dropout High-Power LED Driver
CN5612
General Description:
The CN5612 current regulator operates from a 2.7V
to 6V input voltage range and delivers a constant
current that is up to 1.2A to high-brightness LEDs,
including high-brightness white LED. The LED
current of CN5612 can be adjusted from 30mA to
1.2A 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 CN5612 is available in a thermally enhanced
5-pin TO252 package.
Features:
Operating Supply Voltage Range: 2.7V to 6V
On-chip Pass Element
Low-Dropout Voltage
Adjustable Output Current up to 1.2A
Output Current Accuracy: ±8%
Over Temperature Protection
LED Open/Short Protection
Operating Temperature Range:
40to 85
Available in 5-pin TO252 Packages
Pb-free
Pin Assignment
Applications:
High-Power LED Driver
LED Cap-Lamp
Flash Light and Lighting
Cell Phone, DSC and MP3 Player
LCD and Keyboard Backlight
CN5612
1 2 3 45
Typical Application Circuit
Input Supply Voltage 2.7V to 6V
RISET
VDD
CN5612
ISET
LED
GND
LED
Figure 1 Typical Application Circuit
www.consonance-elec.com
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CN5612 pdf
VIN
R1
LED
VDD
LED
RISET
CN5612
LED
D1
ISET
LED
GND
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 CN5612’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
CN5612
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.
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