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4.5V to 32V Input, Constant Current Boost HB LED Driver
Product Profile
  Application Note
General Description:
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.
High Power LED Lighting Desk Lights and Room Lighting
Building and Street Lighting Industrial Display Backlighting
Constant Current HB LED Driver
4.5V to 32V Input Range
Boost  Operation
330kHz Switching Frequency
±10% LED Current Accuracy
LED Current Set by an External Resistor
Peak Current Mode PWM Controller
PWM Dimming
Cycle-by-Cycle Peak Inductor Current Limit
On-Chip Slope Compensation
Programmable Over Voltage Protection
Internal Soft-start to Avoid Inrush Current
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
Application Note
Circuit Design Procedures for CN5815
Quick Start of CN5815 Demo Board
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