LED Driver. CN5815 Datasheet
4.5V to 32V Input, Constant Current Boost HB LED Driver
The CN5815 is a current mode fixed-frequency
PWM controller for high brightness(HB) LED
driving applications. The device operates from an
input supply between 4.5V and 32V and provides to
drive an external N-channel MOSFET.
The CN5815 contains all the necessary building
blocks including a bandgap reference, a 330KHz
oscillator, current-mode control circuitry, chip
shutdown block, softstart block and gate driver, etc.
LED current is set by an external resistor.
Current mode control provides improved transient
response and simplified loop compensation. On-chip
soft start reduces the inrush current on power up. The
other features include chip shutdown, over voltage
protection, LED dimming, built-in 5V regulator and
slope compensation, etc.
The CN5815 is available in 10-pin SSOP package.
Constant Current HB LED Driver
LED Current Set by an External Resistor
±10% LED Current Accuracy
Peak Current Mode PWM Controller
4.5V to 32V Input Range
330kHz Switching Frequency
Cycle-by-Cycle Peak Inductor Current Limit
On-Chip Slope Compensation
Built-in 5V regulator
Low Shutdown Current
Operating Temperature Range:
－40℃ to 85℃
Available in 10-pin SSOP package.
Lead-free, Rohs-Compliant and Halogen-free
High Brightness LED Lighting
Building and Street Lighting
Constant Current Power Supply
Typical Application Circuit
Figure 1 Typical Application Circuit
Tape and Reel, 3000/Reel
Operating Ambient Temperature
－40℃ to ＋85℃
Over Voltage Protection Input. The PWM converter turns off when the
voltage of this pin goes to higher than 1.205V(Typical), and returns to normal
operation if the voltage at OVP pin falls below 1.151V(Typical).
Feedback Pin. The LED current is feedback to this pin. Generally FB pin should be
connected to an external current sense resistor. In normal operation, the LED current
2 FB is decided by the following equation:
Where, ILED is the LED current, RCS is the current sense resistor as shown in Figure 1.
Compensation Pin. Connect the compensation network between COMP pin and
LED Dimming Input. PWM signal is input to DIM pin. When DIM pin is pulled
low, internal PWM converter is disabled, DRV pin outputs low, no energy is
transferred to LED string; When DIM pin is high, the PWM converter operates
Shutdown Input Pin. Pulling this pin high, places the part into a shutdown mode.
Shutdown mode is characterized by a very low quiescent current. In shutdown mode,
all the functionality of all blocks is disabled and the on-chip 5V regulator is also
shutdown. Pulling this pin low places the part into normal operation mode.
Input Supply Voltage. Positive terminal of input supply. The input voltage range is
4.5V to 32V. Connect a local bypass capacitor from this pin to GND.
＋5V Regulator output. A bypass capacitor of 4.7uF at least should be connected
from this pin to GND. If the input voltage is less than 5.5V, the voltage at VCC pin
may be less than 5V.
Gate Drive Pin. Gate drive for the external N-channel MOSFET. Connect this pin to
the gate of external N-channel MOSFET.
Ground. Negative terminal of input supply.
Inductor Current Sense Pin. The inductor current is sensed at ISW pin on the
cycle-by-cycle basis for both the current mode control and over current protection.
Absolute Maximum Ratings
VIN Terminal Voltage…………..…－0.3V to 36V
Other Terminals Voltage…………..－0.3V to 6.5V
Operating Temperature…..............－40℃ to 85℃
Thermal Resistance(Junction to Case) .....200℃/W
Maximum Junction Temperature……………150℃
Storage Temperature……….......－65℃ to 150℃
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device reliability.