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CN5815 Datasheet(PDF) 5 Page - Shanghai Consonance Electronics Incorporated

Part No. CN5815
Description  4.5V to 32V Input, Constant Current Boost HB LED Driver
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Maker  CONSONANCE [Shanghai Consonance Electronics Incorporated]
Homepage  http://www.consonance-elec.com/
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CN5815 Datasheet(HTML) 5 Page - Shanghai Consonance Electronics Incorporated

 
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CONSONANCE
www.consonance-elec.com
5
REV 1.0
Detailed Description
The CN5815 is a current mode fixed-frequency PWM controller for high brightness LED driving applications.
The device operates from an input supply between 4.5V and 32V and provides to drive an external N-channel
MOSFET. LED current is set by an external LED current sense resistor.
The CN5815 contains all the necessary building blocks including a bandgap reference, error amplifier, 330KHz
oscillator, compensation slope generator, current-mode control circuitry, inductor over current protection circuit,
LED dimming block, chip shutdown block, soft start block and gate driver, etc.
Current mode control provides improved transient response and simplified loop compensation. A dedicated
COMP pin allows the optimization of loop response. Soft start reduces the inrush current on power up.
The internal over voltage comparator and OVP pin monitor the LED voltage for LED open circuit protection, if
voltage at OVP pin is higher than 1.205V(Typical), the DRV pin will be pulled low until the LED voltage falls
below 1.151V(Typical).
Application Information
Input Voltage Range
The CN5815 is intended to implement boost LED driving function. The input voltage range is from 4.5V to 32V.
Shutdown
The SHDN pin is active high shutdown input. Pulling this pin above 2.3V causes the CN5815 to completely shut
down and enter a low current consumption state. In this state, the regulator connected to the VCC pin is turned
off. Pulling SHDN pin below 0.5V brings the CN5815 back to normal operation.
+5V Regulator
The CN5815 includes a fixed +5V output regulator that delivers up to 4mA of load current for low-power
applications throughout the +5.5V to +32V input voltage range. The regulator supplies power for the internal
low voltage circuitry of the controller including the gate driver.
Connect a bypass capacitor of 4.7uF at least from VCC pin to GND.
If the +5V regulator is used to power external circuitry, care should be taken not to overload the +5V regulator,
otherwise the capability to drive external N-channel MOSFET may be affected.
When SHDN pin is pulling high, the 5V regulator is also turned off.
Setting LED Current
The LED current is set by placing a current sense resistor between FB pin and GND. The LED current is decided
by the following formula:
Where:
ILED is the LED current
RCS is the current sense resistor between the FB pin and GND
Setting the Over Voltage Protection Level
The CN5815 is equipped with Over Voltage Protection (OVP) function. When the voltage at OVP pin exceeds a
threshold of 1.205V(Typical), the power switch is turned off. The power switch can be turned on again once the
voltage at OVP pin drops below 1.151V(Typical). As shown in Figure 1, the OVP voltage can be set by the
following equation:
Where, R1 and R2 form the resistor divider at OVP pin.


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